Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2015	Apr. 30, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	YHOO
Entity Registrant Name	YAHOO INC
Entity Central Index Key	0001011006
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		938,442,668

Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,174,657	$ 2,664,098
Short-term marketable securities	4,109,789	5,327,412
Accounts receivable, net	924,411	1,032,704
Prepaid expenses and other current assets	813,790	671,075
Total current assets	7,022,647	9,695,289
Long-term marketable securities	1,618,544	2,230,892
Property and equipment, net	1,483,772	1,487,684
Goodwill	5,140,270	5,163,654
Intangible assets, net	441,869	470,842
Other long-term assets and investments	510,418	554,616
Investment in Alibaba Group	31,927,985	39,867,789
Investments in equity interests	2,346,201	2,489,578
Total assets	50,491,706	61,960,344
Current liabilities:
Accounts payable	269,160	238,018
Income taxes payable related to sale of Alibaba Group ADSs		3,282,293
Other accrued expenses and current liabilities	858,353	671,307
Deferred revenue	270,886	336,963
Total current liabilities	1,398,399	4,528,581
Convertible notes	1,185,880	1,170,423
Long-term deferred revenue	22,228	20,774
Other long-term liabilities	130,826	143,095
Deferred tax liabilities related to investment in Alibaba Group	12,919,754	16,154,906
Deferred and other long-term tax liabilities	1,130,993	1,156,973
Total liabilities	16,788,080	23,174,752
Commitments and contingencies (Note 12)
Yahoo! Inc. stockholders' equity:
Common stock, $0.001 par value; 5,000,000 shares authorized; 949,771 shares issued and 936,838 shares outstanding as of December 31, 2014 and 954,399 shares issued and 937,235 shares outstanding as of March 31, 2015	950	945
Additional paid-in capital	8,585,941	8,496,683
Treasury stock at cost, 12,933 shares as of December 31, 2014 and 17,164 shares as of March 31, 2015	(914,218)	(712,455)
Retained earnings	8,958,235	8,937,036
Accumulated other comprehensive income	17,027,988	22,019,628
Total Yahoo! Inc. stockholders' equity	33,658,896	38,741,837
Noncontrolling interests	44,730	43,755
Total equity	33,703,626	38,785,592
Total liabilities and equity	$ 50,491,706	$ 61,960,344

Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	954,399	949,771
Common stock, shares outstanding	937,235	936,838
Treasury stock at cost, shares	17,164	12,933

Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$ 1,225,970	$ 1,132,730
Operating expenses:
Cost of revenue - traffic acquisition costs	183,139	45,909
Cost of revenue - other	285,263	293,603
Sales and marketing	275,357	302,325
Product development	326,747	268,264
General and administrative	173,513	164,623
Amortization of intangibles	20,073	18,340
Gain on sale of patents	(2,000)
Restructuring charges, net	51,232	9,487
Total operating expenses	1,313,324	1,102,551
Income (loss) from operations	(87,354)	30,179
Other expense, net	(31,063)	(13,453)
Income (loss) before income taxes and earnings in equity interests	(118,417)	16,726
(Provision) benefit for income taxes	40,900	(4,217)
Earnings in equity interests, net of tax	99,690	301,402
Net income	22,173	313,911
Net income attributable to noncontrolling interests	(975)	(2,333)
Net income attributable to Yahoo! Inc.	21,198	311,578
Net income attributable to Yahoo! Inc. common stockholders per share - basic	$ 0.02	$ 0.31
Net income attributable to Yahoo! Inc. common stockholders per share - diluted	$ 0.02	$ 0.29
Shares used in per share calculation - basic	934,748	1,009,890
Shares used in per share calculation - diluted	947,976	1,031,420
Stock-based compensation expense by function:
Stock-based compensation expense by function	115,696	109,181
Cost of revenue - other
Stock-based compensation expense by function:
Stock-based compensation expense by function	6,009	24,651
Sales and marketing
Stock-based compensation expense by function:
Stock-based compensation expense by function	38,121	50,674
Product development
Stock-based compensation expense by function:
Stock-based compensation expense by function	48,221	13,927
General and administrative
Stock-based compensation expense by function:
Stock-based compensation expense by function	23,345	19,929
Restructuring charges
Stock-based compensation expense by function:
Stock-based compensation expense by function	$ 2,705

Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 22,173	$ 313,911
Available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities, net of taxes of $(898) and $3,238,133 for the three months ended March 31, 2014 and 2015, respectively	(4,713,620)	6,728
Reclassification adjustment for realized (gains) losses on available-for-sale securities included in net income, net of taxes of $8 and $(50) for the three months ended March 31, 2014 and 2015, respectively	84	(12)
Net change in unrealized gains on available-for-sale securities, net of tax	(4,713,536)	6,716
Foreign currency translation adjustments ("CTA"):
Foreign CTA gains (losses), net of taxes of $(7,186) and $582 for the three months ended March 31, 2014 and 2015, respectively	(271,242)	(146,857)
Net investment hedge CTA gains (losses), net of taxes of $8,432 and $(1,591) for the three months ended March 31, 2014 and 2015, respectively	2,634	(14,049)
Net foreign CTA losses, net of tax	(268,608)	(160,906)
Cash flow hedges:
Unrealized gains (losses) on cash flow hedges, net of taxes of $304 and $376 for the three months ended March 31, 2014 and 2015, respectively	(11,156)	(506)
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income, net of taxes of $273 and $189 for the three months ended March 31, 2014 and 2015, respectively	1,660	(454)
Net change in unrealized losses on cash flow hedges, net of tax	(9,496)	(960)
Other comprehensive loss	(4,991,640)	(155,150)
Comprehensive income (loss)	(4,969,467)	158,761
Less: comprehensive income attributable to noncontrolling interests	(975)	(2,333)
Comprehensive income (loss) attributable to Yahoo! Inc.	$ (4,970,442)	$ 156,428

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Unrealized gains (losses) on available-for-sale securities, taxes	$ 3,238,133	$ (898)
Reclassification adjustment for realized (gains) losses on available-for-sale securities included in net income, taxes	(50)	8
Foreign CTA gains (losses), net of taxes	582	(7,186)
Net investment hedge CTA gains (losses), taxes	(1,591)	8,432
Unrealized gains (losses) on cash flow hedges, taxes	376	304
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income, taxes	$ 189	$ 273

Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 22,173	$ 313,911
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	117,061	123,185
Amortization of intangible assets	34,478	34,349
Accretion of convertible notes discount	15,457	14,666
Stock-based compensation expense	118,401	109,181
Non-cash restructuring charges	(859)
Loss from sales of investments, assets, and other, net	34,308	3,550
Gain on sale of patents	(2,000)
Loss on Hortonworks warrants	11,909
Earnings in equity interests	(99,690)	(301,402)
Tax benefits from stock-based awards	32,822	57,667
Excess tax benefits from stock-based awards	(37,470)	(59,556)
Deferred income taxes	17,009	14,488
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	89,923	98,404
Prepaid expenses and other	(64,245)	(9,211)
Accounts payable	30,613	19,492
Accrued expenses and other liabilities	89,934	(240,175)
Income taxes payable related to sale of Alibaba Group ADSs	(3,282,293)
Deferred revenue	(65,002)	(39,488)
Net cash provided by (used in) operating activities	(2,937,471)	139,061
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment, net	(134,921)	(84,655)
Purchases of marketable securities	(712,818)	(912,097)
Proceeds from sales of marketable securities	172,352	168,926
Proceeds from maturities of marketable securities	2,359,767	281,662
Acquisitions, net of cash acquired	(23,073)	(21,661)
Proceeds from sales of patents	20,000
Purchases of intangible assets	(1,160)	(1,190)
Proceeds from settlement of derivative hedge contracts	19,627	2,801
Payments for settlement of derivative hedge contracts	(2,151)	(600)
Payments for equity investments in privately held companies		(10,399)
Other investing activities, net	(38)	(566)
Net cash (used in) provided by investing activities	1,697,585	(577,779)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	36,189	78,977
Repurchases of common stock	(203,771)	(449,578)
Excess tax benefits from stock-based awards	37,470	59,556
Tax withholdings related to net share settlements of restricted stock units	(97,426)	(125,403)
Other financing activities, net	(4,573)	(3,093)
Net cash used in financing activities	(232,111)	(439,541)
Effect of exchange rate changes on cash and cash equivalents	(17,444)	(1,315)
Net change in cash and cash equivalents	(1,489,441)	(879,574)
Cash and cash equivalents at beginning of period	2,664,098	2,077,590
Cash and cash equivalents at end of period	$ 1,174,657	$ 1,198,016

The Company And Summary Of Significant Accounting Policies

3 Months Ended

Mar. 31, 2015

The Company And Summary Of Significant Accounting Policies

Note 1 The Company And Summary Of Significant Accounting Policies

The Company. Yahoo! Inc., together with its consolidated subsidiaries (“Yahoo” or the “Company”), is a guide focused on informing, connecting, and entertaining our users. By creating highly personalized experiences for its users, the Company keeps people connected to what matters most to them, across devices and around the world. In turn, the Company creates value for advertisers by connecting them with the audiences that build their businesses. For advertisers, the opportunity to be a part of users’ digital habits across products and platforms is a powerful tool to engage audiences and build brand loyalty. Advertisers can build their businesses by advertising to targeted audiences on the Company’s online properties and services (“Yahoo Properties”) and through a distribution network of third-party entities (“Affiliates”) who integrate the Company’s advertising offerings into their Websites or other offerings (“Affiliate sites”). The Company manages and measures its business geographically, principally in the Americas, EMEA (Europe, Middle East, and Africa) and Asia Pacific.

Basis of Presentation. The condensed consolidated financial statements include the accounts of Yahoo! Inc. and its majority-owned or otherwise controlled subsidiaries. All significant intercompany accounts and transactions have been eliminated. Investments in entities in which the Company can exercise significant influence, but does not own a majority equity interest or otherwise control, are accounted for using the equity method and are included as investments in equity interests on the condensed consolidated balance sheets. The Company has included the results of operations of acquired companies from the date of the acquisition. Beginning in the three months ended March 31, 2015, the Company classifies editorial costs as cost of revenue — other rather than including such costs in sales and marketing expense. To conform to the current period presentation, the Company reclassified $13 million in certain website editorial costs previously included in sales and marketing expense to cost of revenue — other for the three months ended March 31, 2014. Also, beginning in the three months ended March 31, 2015, the Company classifies non-datacenter facilities-related costs within general and administrative expense. To conform to the current period presentation, the Company reclassified $13 million in facilities-related costs previously included in product development expense and $15 million previously included in sales and marketing expense to general and administrative expense for the three months ended March 31, 2014. Certain prior period amounts have been reclassified to conform to the current period presentation.

The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of only normal recurring items, which, in the opinion of management, are necessary for a fair statement of the results of operations for the periods shown. The results of operations for such periods are not necessarily indicative of the results expected for the full year or for any future periods.

The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses and the related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, the useful lives of long-lived assets including property and equipment and intangible assets, investment fair values, stock-based compensation, goodwill, income taxes, contingencies, and restructuring charges. The Company bases its estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, when these carrying values are not readily available from other sources. Actual results may differ from these estimates.

These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed consolidated balance sheet as of December 31, 2014 was derived from the Company’s audited financial statements for the year ended December 31, 2014, but does not include all disclosures required by U.S. GAAP. However, the Company believes the disclosures are adequate to make the information presented not misleading.

Cost of revenue — TAC. TAC consists of payments made to third parties that have integrated the Company’s advertising offerings into their Websites or other offerings and payments made to companies that direct consumer and business traffic to Yahoo Properties. TAC is either recorded as a reduction of revenue or cost of revenue. TAC related to the Company’s Search and Advertising Sales Agreement (as amended, the “Search Agreement”) with Microsoft Corporation (“Microsoft”) is recorded as a reduction of revenue. See Note 17 — “Search Agreement with Microsoft Corporation” for a description of the Search Agreement and License Agreement with Microsoft. TAC related to the Company’s other offerings is recorded as cost of revenue — TAC. The Company also has an agreement to compensate a third party, Mozilla Corporation (“Mozilla”), to make the Company the default search provider on certain of Mozilla’s products in the United States. The Company records these payments as cost of revenue – TAC.

Recent Accounting Pronouncements. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition” and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments in ASU 2014-09 are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with early application not permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s financial position, results of operations and cash flows.

Marketable Securities, Investments And Fair Value Disclosures

3 Months Ended

Mar. 31, 2015

Marketable Securities, Investments And Fair Value Disclosures

Note 2 Marketable Securities, Investments And Fair Value Disclosures

The following tables summarize the available-for-sale securities (in thousands):


	December 31, 2014
	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Government and agency securities	$	850,712	$	82	$	(792	)	$	850,002
Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit		6,711,683		612		(4,653	)		6,707,642
Alibaba Group equity securities		2,713,484		37,154,305		—			39,867,789
Hortonworks equity securities		26,246		77,783		—			104,029
Other corporate equity securities		230		430		—			660

Total available-for-sale marketable securities	$	10,302,355	$	37,233,212	$	(5,445	)	$	47,530,122


	March 31, 2015
	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Government and agency securities	$	817,974	$	392	$	(156	)	$	818,210
Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit		4,908,876		2,012		(1,443	)		4,909,445
Alibaba Group equity securities		2,713,484		29,214,501		—			31,927,985
Hortonworks equity securities		26,246		65,438		—			91,684
Other corporate equity securities		230		448		—			678

Total available-for-sale marketable securities	$	8,466,810	$	29,282,791	$	(1,599	)	$	37,748,002


	December 31, 2014		March 31, 2015
Reported as:
Short-term marketable securities	$	5,327,412	$	4,109,789
Long-term marketable securities		2,230,892		1,618,544
Investment in Alibaba Group		39,867,789		31,927,985
Other long-term assets and investments		104,029		91,684

Total	$	47,530,122	$	37,748,002

Short-term, highly liquid investments of $2.0 billion and $533 million as of December 31, 2014 and March 31, 2015, respectively, included in cash and cash equivalents on the condensed consolidated balance sheets are not included in the table above as the gross unrealized gains and losses were immaterial as the carrying value approximates fair value because of the short maturity of those instruments. Realized gains and losses from sales of available-for-sale marketable debt securities were not material for both the three months ended March 31, 2014 and 2015.

The remaining contractual maturities of available-for-sale marketable debt securities were as follows (in thousands):


	December 31, 2014		March 31, 2015
Due within one year	$	5,327,412	$	4,109,789
Due after one year through five years		2,230,892		1,618,544

Total available-for-sale marketable debt securities	$	7,558,304	$	5,728,333

The following tables show all available-for-sale marketable debt securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):


	December 31, 2014
	Less than 12 Months					12 Months or Longer					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Government and agency securities	$	744,948	$	(792	)	$	—	$	—		$	744,948	$	(792	)
Corporate debt securities, commercial paper, and bank certificates of deposit		2,601,288		(4,646	)		3,234		(7	)		2,604,522		(4,653	)

Total available-for-sale marketable debt securities	$	3,346,236	$	(5,438	)	$	3,234	$	(7	)	$	3,349,470	$	(5,445	)


	March 31, 2015
	Less than 12 Months					12 Months or Longer					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Government and agency securities	$	317,476	$	(156	)	$	—	$	—		$	317,476	$	(156	)
Corporate debt securities, commercial paper, and bank certificates of deposit		1,528,735		(1,440	)		8,642		(3	)		1,537,377		(1,443	)

Total available-for-sale marketable debt securities	$	1,846,211	$	(1,596	)	$	8,642	$	(3	)	$	1,854,853	$	(1,599	)

The Company’s investment portfolio includes equity securities of Alibaba Group Holdings Limited (“Alibaba Group”) and Hortonworks, Inc. (“Hortonworks”), as well as liquid high-quality fixed income debt securities including government, agency and corporate debt, money market funds, and time deposits with financial institutions. The fair value of any equity investment will vary over time and is subject to a variety of market risks including: macro-economic, regulatory, industry, company performance, and systemic risks of the equity markets overall. Consequently, the carrying value of the Company’s investment portfolio will vary over time as the value of its investment changes. Investments in both fixed rate and floating rate interest earning instruments carry a degree of interest rate risk. Fixed rate securities may have their fair value adversely impacted due to a rise in interest rates, while floating rate securities may produce less income than expected if interest rates fall. Fixed income securities may have their fair value adversely impacted due to a deterioration of the credit quality of the issuer. The longer the term of the securities, the more susceptible they are to changes in market rates. Investments are reviewed periodically to identify possible other-than-temporary impairment. The Company has no current requirement or intent to sell the securities in an unrealized loss position. The Company expects to recover up to (or beyond) the initial cost of investment for securities held.

The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of December 31, 2014 (in thousands):


	Fair Value Measurements at Reporting Date Using
Assets	Level 1		Level 2			Level 3		Total
Money market funds⁽¹⁾	$	373,822	$	—		$	—	$	373,822
Available-for-sale marketable debt securities:
Government and agency securities⁽¹⁾		—		850,002			—		850,002
Commercial paper and bank certificates of deposit⁽¹⁾		—		3,602,321			—		3,602,321
Corporate debt securities⁽¹⁾		—		3,327,017			—		3,327,017
Time deposits⁽¹⁾		—		1,361,165			—		1,361,165
Available-for-sale equity securities:
Other corporate equity securities		660		—			—		660
Alibaba Group equity securities		39,867,789		—			—		39,867,789
Hortonworks equity securities⁽²⁾		104,029		—			—		104,029
Hortonworks warrants		—		—			98,062		98,062
Foreign currency derivative contracts⁽³⁾		—		202,928			—		202,928

Financial assets at fair value	$	40,346,300	$	9,343,433		$	98,062	$	49,787,795

Liabilities
Foreign currency derivative contracts⁽³⁾		—		(6,157	)		—		(6,157	)

Total financial assets and liabilities at fair value	$	40,346,300	$	9,337,276		$	98,062	$	49,781,638

The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of March 31, 2015 (in thousands):


	Fair Value Measurements at Reporting Date Using
Assets	Level 1		Level 2			Level 3		Total
Money market funds⁽¹⁾	$	465,991	$	—		$	—	$	465,991
Available-for-sale marketable debt securities:
Government and agency securities⁽¹⁾		—		818,210			—		818,210
Commercial paper and bank certificates of deposit⁽¹⁾		—		1,983,908			—		1,983,908
Corporate debt securities⁽¹⁾		—		2,901,525			—		2,901,525
Time deposits⁽¹⁾		—		90,857			—		90,857
Available-for-sale equity securities:
Other corporate equity securities		678		—			—		678
Alibaba Group equity securities		31,927,985		—			—		31,927,985
Hortonworks equity securities⁽²⁾		91,684		—			—		91,684
Hortonworks warrants		—		—			86,153		86,153
Foreign currency derivative contracts⁽³⁾		—		205,406			—		205,406

Financial assets at fair value	$	32,486,338	$	5,999,906		$	86,153	$	38,572,397

Liabilities
Foreign currency derivative contracts⁽³⁾		—		(9,846	)		—		(9,846	)

Total financial assets and liabilities at fair value	$	32,486,338	$	5,990,060		$	86,153	$	38,562,551

(1)

The money market funds, government and agency securities, commercial paper and bank certificates of deposit, corporate debt securities, and time deposits are classified as part of either cash and cash equivalents or short or long-term marketable securities on the condensed consolidated balance sheets.

(2)	The Hortonworks equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets.

(3)

Foreign currency derivative contracts are classified as part of either other current or noncurrent assets or liabilities on the condensed consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were: $2.1 billion, including contracts designated as net investment hedges of $1.6 billion, as of December 31, 2014; and $2.4 billion, including contracts designated as net investment hedges of $1.9 billion, as of March 31, 2015.

The amount of cash and cash equivalents as of December 31, 2014 and March 31, 2015 included $702 million and $642 million, respectively, in cash.

The fair values of the Company’s Level 1 financial assets and liabilities are based on quoted prices in active markets for identical assets or liabilities. The fair values of the Company’s Level 2 financial assets and liabilities are obtained using quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets in markets that are not active; and inputs other than quoted prices (e.g., interest rates and yield curves). The Company utilizes a pricing service to assist in obtaining fair value pricing for the marketable debt securities. The fair value of this Level 3 financial asset was determined using a Black-Scholes model.

Activity between Levels of the Fair Value Hierarchy

During the year ended December 31, 2014 and the three months ended March 31, 2015, the Company did not make any transfers between Level 1, Level 2, and Level 3 assets or liabilities.

Hortonworks Warrants

The estimated fair value of the Hortonworks warrants was $98 million and $86 million as of December 31, 2014 and March 31, 2015, respectively. During the three months ended March 31, 2015, the Company recorded a loss of $12 million due to the decline in fair value of the Hortonworks warrants, which was included within other expense, net in the Company’s condensed consolidated statements of income. The fair value of the Company’s Level 3 financial asset was determined using a Black-Scholes model.

Assets and Liabilities at Fair Value on a Nonrecurring Basis

Convertible Senior Notes

In 2013, the Company issued $1.4375 billion aggregate principal amount of 0.00% Convertible Senior Notes due 2018 (the “Notes”). The Notes are carried at their original issuance value, net of unamortized debt discount, and are not marked to market each period. The approximate estimated fair value of the Notes as of both December 31, 2014 and March 31, 2015 was $1.2 billion. The fair value of the Notes was determined on the basis of quoted market prices observable in the market and is considered Level 2 in the fair value hierarchy. See Note 11 — “Convertible Notes” for additional information related to the Notes.

Other Investments

As of December 31, 2014 and March 31, 2015, the Company held approximately $82 million of investments in equity securities of privately-held companies that are accounted for using the cost method. These investments are included within other long-term assets and investments on the condensed consolidated balance sheets. Such investments are reviewed periodically for impairment using fair value measurements.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References+ Details

Consolidated Financial Statement Details

3 Months Ended

Mar. 31, 2015

Consolidated Financial Statement Details

Note 3 Consolidated Financial Statement Details

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income were as follows (in thousands):


	December 31, 2014			March 31, 2015
Unrealized gains on available-for-sale securities, net of tax	$	22,086,371		$	17,373,280
Unrealized gains (losses) on cash flow hedges, net of tax		445			(9,496	)
Foreign currency translation, net of tax		(67,188	)		(335,796	)

Accumulated other comprehensive income	$	22,019,628		$	17,027,988

Noncontrolling Interests

Noncontrolling interests were as follows (in thousands):


	December 31, 2014			March 31, 2015
Beginning noncontrolling interests	$	55,688		$	43,755
Distributions to noncontrolling interests		(22,344	)		—
Net income attributable to noncontrolling interests		10,411			975

Ending noncontrolling interests	$	43,755		$	44,730

Other Expense, Net

Other expense, net was as follows (in thousands):


	Three Months Ended
	March 31, 2014			March 31, 2015
Interest, dividend and investment income	$	5,437		$	8,845
Interest expense		(17,081	)		(17,570	)
Loss on Hortonworks warrants		—			(11,909	)
Other expense, net		(1,809	)		(10,429	)

Total other expense, net	$	(13,453	)	$	(31,063	)

Interest, dividend and investment income consists of income earned from cash in bank accounts, investments made in marketable debt securities and money market funds.

Interest expense is related to the Notes, interest expense on notes payable related to building obligations and capital lease obligations for data centers.

During the three months ended March 31, 2015, the Company recorded a loss of $12 million due to the decline in fair value of the Hortonworks warrants, which was included within other expense, net in the condensed consolidated statements of income.

Other expense, net consists of gains and losses from sales or impairments of marketable securities and/or investments in privately-held companies, foreign exchange gains and losses due to re-measurement of monetary assets and liabilities denominated in non-functional currencies, and unrealized and realized foreign currency transaction gains and losses, including gains and losses related to balance sheet hedges.

Other expense, net increased $9 million for the three months ended March 31, 2015, compared to the same period of 2014, primarily due to unrealized foreign exchange currency transaction losses of $36 million partially offset by foreign exchange gains from hedging activities of $24 million.

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2014 were as follows (in thousands):


	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
Realized gains on cash flow hedges, net of tax	$	(454	)	Revenue
Realized gains on available-for-sale securities, net of tax		(12	)	Other income, net

Total reclassifications for the period	$	(466	)

Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2015 were as follows (in thousands):


	Amount Reclassified from Accumulated Other Comprehensive Income		Affected Line Item in the Statement of Income
Realized losses on cash flow hedges, net of tax	$	1,660	Revenue
Realized losses on available-for-sale securities, net of tax		84	Other income, net

Total reclassifications for the period	$	1,744

Acquisitions

3 Months Ended

Mar. 31, 2015

Acquisitions

Note 4 Acquisitions

During the three months ended March 31, 2014, the Company acquired five companies, all of which were accounted for as business combinations. The total purchase price for these acquisitions was $23 million less cash acquired of $1 million, which resulted in a net cash outlay of $22 million. The purchase price for the assets and liabilities assumed was allocated based on their estimated fair values as follows: $9 million to amortizable intangibles; $1 million to cash acquired; and the remainder of $13 million to goodwill. Goodwill represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes.

During the three months ended March 31, 2015, the Company acquired one company which was accounted for as a business combination. The total purchase price for this acquisition was $23 million. The preliminary purchase price allocation of the assets acquired and liabilities assumed based on their estimated fair values was as follows: $5 million to amortizable intangibles; $2 million to net liabilities assumed; and the remainder of $20 million to goodwill. Goodwill represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes.

The Company’s business combinations completed during the three months ended March 31, 2014 and 2015 did not have a material impact on the Company’s condensed consolidated financial statements and therefore actual and proforma disclosures have not been presented.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Goodwill

3 Months Ended

Mar. 31, 2015

Goodwill

Note 5 Goodwill

The changes in the carrying amount of goodwill for the three months ended March 31, 2015 were as follows (in thousands):


	Americas⁽¹⁾			EMEA⁽²⁾			Asia Pacific⁽³⁾		Total
Net balance as of January 1, 2015	$	4,333,957		$	531,815		$	297,882	$	5,163,654
Acquisitions and other		(7,239	)		20,903			—		13,664
Foreign currency translation adjustments		(1,370	)		(36,124	)		446		(37,048	)

Net balance as of March 31, 2015	$	4,325,348		$	516,594		$	298,328	$	5,140,270

(1)	Gross goodwill balance for the Americas segment was $4.3 billion as of March 31, 2015.

(2)	Gross goodwill balance for the EMEA segment was $1.1 billion as of March 31, 2015. The EMEA segment includes accumulated impairment losses of $630 million as of March 31, 2015.

(3)	Gross goodwill balance for the Asia Pacific (“APAC”) segment was $457 million as of March 31, 2015. The APAC segment includes accumulated impairment losses of $159 million as of March 31, 2015.

Intangible Assets, Net

3 Months Ended

Mar. 31, 2015

Intangible Assets, Net

Note 6 Intangible Assets, Net

The following table summarizes the Company’s intangible assets, net (in thousands):


	December 31, 2014		March 31, 2015
	Net		Gross Carrying Amount		Accumulated Amortization^(*)			Net
Customer, affiliate, and advertiser related relationships	$	281,596	$	375,014	$	(105,631	)	$	269,383
Developed technology and patents		122,674		202,498		(93,068	)		109,430
Trade names, trademarks, and domain names		66,572		107,939		(44,883	)		63,056

Total intangible assets, net	$	470,842	$	685,451	$	(243,582	)	$	441,869

(*)	Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, increased total intangible assets by approximately $17 million as of March 31, 2015.

For both the three months ended March 31, 2014 and 2015, the Company recognized amortization expense for intangible assets of $34 million, including $16 million and $14 million in cost of revenue — other for the three months ended March 31, 2014 and 2015, respectively. Based on the current amount of intangibles subject to amortization, the estimated amortization expense for the remainder of 2015 and each of the succeeding years is as follows: nine months ending December 31, 2015: $98 million; 2016: $107 million; 2017: $98 million; 2018: $80 million; 2019: $43 million; and cumulatively thereafter: $1 million.

Basic and Diluted Net Income Attributable to Yahoo! Inc. Common Stockholders Per Share

3 Months Ended

Mar. 31, 2015

Basic and Diluted Net Income Attributable to Yahoo! Inc. Common Stockholders Per Share

Note 7 Basic And Diluted Net Income Attributable To Yahoo! Inc. Common Stockholders Per Share

Basic and diluted net income attributable to Yahoo! Inc. common stockholders per share is computed using the weighted average number of common shares outstanding during the period, excluding net income attributable to participating securities (restricted stock units granted under the Directors’ Stock Plan (the “Directors’ Plan”)). Diluted net income per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares are calculated using the treasury stock method and consist of unvested restricted stock and shares underlying unvested restricted stock units, the incremental common shares issuable upon the exercise of stock options, and shares to be purchased under the 1996 Employee Stock Purchase Plan (the “Employee Stock Purchase Plan”). The Company calculates potential tax windfalls and shortfalls by including the impact of pro forma deferred tax assets.

The Company takes into account the effect on consolidated net income per share of dilutive securities of entities in which the Company holds equity interests that are accounted for using the equity method.

Potentially dilutive securities representing approximately 2 million shares of common stock for both the three months ended March 31, 2014 and 2015 were excluded from the computation of diluted earnings per share for these periods because their effect would have been anti-dilutive.

The Company has the option to pay cash, issue shares of common stock or any combination thereof for the aggregate amount due upon conversion of the Notes. The Company’s intent is to settle the principal amount of the Notes in cash upon conversion. As a result, upon conversion of the Notes, only the amounts payable in excess of the principal amounts of the Notes are considered in diluted earnings per share under the treasury stock method.

The denominator for diluted net income per share does not include any effect from the note hedges. In future periods, the denominator for diluted net income per share will exclude any effect of the note hedges, if their effect would be anti-dilutive. In the event an actual conversion of any or all of the Notes occurs, the shares that would be delivered to the Company under the note hedges are designed to neutralize the dilutive effect of the shares that the Company would issue under the Notes. See Note 11 — “Convertible Notes” for additional information.

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):


	Three Months Ended
	March 31, 2014			March 31, 2015
*Basic:*
Numerator:
Net income attributable to Yahoo! Inc.	$	311,578		$	21,198
Less: Net income allocated to participating securities		(3	)		—

Net income attributable to Yahoo! Inc. common stockholders — basic	$	311,575		$	21,198

Denominator:
Weighted average common shares		1,009,890			934,748

Net income attributable to Yahoo! Inc. common stockholders per share — basic	$	0.31		$	0.02

*Diluted:*
Numerator:
Net income attributable to Yahoo! Inc.	$	311,578		$	21,198
Less: Net income allocated to participating securities		(3	)		—
Less: Effect of dilutive securities issued by equity investees		(12,365	)		(1,194	)

Net income attributable to Yahoo! Inc. common stockholders — diluted	$	299,210		$	20,004

Denominator:
Denominator for basic calculation		1,009,890			934,748
Weighted average effect of Yahoo! Inc. dilutive securities:
Restricted stock units		15,670			10,913
Stock options and employee stock purchase plan		5,860			2,315

Denominator for diluted calculation		1,031,420			947,976

Net income attributable to Yahoo! Inc. common stockholders per share — diluted	$	0.29		$	0.02

- Definition

The entire disclosure for earnings per share.

+ References+ Details

Investments In Equity Interests Accounted For Using The Equity Method Of Accounting

3 Months Ended

Mar. 31, 2015

Investments In Equity Interests Accounted For Using The Equity Method Of Accounting

Note 8 Investments In Equity Interests Accounted For Using The Equity Method Of Accounting

The following table summarizes the Company’s investments in equity interests accounted for using the equity method of accounting (dollars in thousands):


	December 31, 2014		Percent Ownership			March 31, 2015		Percent Ownership
Yahoo Japan	$	2,482,660		35.5	%	$	2,339,611		35.5	%
Other		6,918		20	%		6,590		20	%

Total	$	2,489,578				$	2,346,201

Equity Investment in Yahoo Japan

The investment in Yahoo Japan Corporation (“Yahoo Japan”) is accounted for using the equity method and the total investment, including net tangible assets, identifiable intangible assets, and goodwill, is classified as part of the investments in equity interests balance on the Company’s condensed consolidated balance sheets. The Company records its share of the results of Yahoo Japan, and any related amortization expense, one quarter in arrears within earnings in equity interests in the condensed consolidated statements of income.

The Company makes adjustments to the earnings in equity interests line in the condensed consolidated statements of income for any differences between U.S. GAAP and International Financial Reporting Standards (“IFRS”), the standards by which Yahoo Japan’s financial statements are prepared.

The fair value of the Company’s ownership interest in the common stock of Yahoo Japan, based on the quoted stock price, was approximately $8 billion as of March 31, 2015.

In the three months ended March 31, 2014, the Company sold data center assets and assigned a data center lease to Yahoo Japan for cash proceeds of $11 million and recorded a net gain of approximately $5 million.

The following tables present summarized financial information derived from Yahoo Japan’s consolidated financial statements, which are prepared on the basis of IFRS. The Company has made adjustments to the Yahoo Japan financial information to address differences between IFRS and U.S. GAAP that materially impact the summarized financial information below. Due to these adjustments, the Yahoo Japan summarized financial information presented below is not materially different than such information presented on the basis of U.S. GAAP.


	Three Months Ended
	December 31, 2013		December 31, 2014
	(In thousands)
Operating data:
Revenue	$	1,031,656	$	941,241
Gross profit	$	843,926	$	750,984
Income from operations	$	489,442	$	425,053
Net income	$	307,112	$	286,793
Net income attributable to Yahoo Japan	$	304,345	$	284,846


	September 30, 2014		December 31, 2014
	(In thousands)
Balance sheet data:
Current assets	$	6,161,126	$	5,693,613
Long-term assets	$	1,908,379	$	1,871,194
Current liabilities	$	1,948,540	$	1,725,200
Long-term liabilities	$	35,418	$	33,647
Noncontrolling interests	$	66,998	$	69,634

Under technology and trademark license and other commercial arrangements with Yahoo Japan, the Company records revenue from Yahoo Japan based on a percentage of advertising revenue earned by Yahoo Japan. The Company recorded revenue from Yahoo Japan of approximately $68 million and $60 million for the three months ended March 31, 2014 and 2015, respectively. As of December 31, 2014 and March 31, 2015, the Company had net receivable balances from Yahoo Japan of approximately $47 million and $39 million, respectively.

Alibaba Group

Equity Investment in Alibaba Group. Prior to the close of the initial public offering (“Alibaba Group IPO”) by Alibaba Group of American Depositary Shares (“ADSs”) in September 2014, the Company’s investment in Alibaba Group was accounted for using the equity method, and the total investment, including net tangible assets, identifiable intangible assets and goodwill, was classified as part of investments in equity interests on the Company’s consolidated balance sheets. Prior to the Alibaba Group IPO, the Company recorded its share of the results of Alibaba Group one quarter in arrears, within earnings in equity interests in the consolidated statements of income, including any related tax impacts related to the earnings in equity interest.

See Note 2 — “Marketable Securities, Investments and Fair Value Disclosures” for additional information.

Technology and Intellectual Property License Agreement (the “TIPLA”). As a result of the Alibaba Group IPO, the TIPLA will terminate on September 18, 2015 and Alibaba Group’s obligation to make royalty payments under the TIPLA ceased on September 24, 2014. The remaining TIPLA deferred revenue of $129 million is now being recognized ratably over the remaining term of the TIPLA through September 18, 2015. For the three months ended March 31, 2014 and 2015, the Company recognized approximately $68 million and $69 million, respectively, related to the TIPLA.

Spin-Off of Remaining Holdings in Alibaba Group. On January 27, 2015, Yahoo announced a plan for a spin-off of all of the Company’s remaining holdings in Alibaba Group into a newly formed independent registered investment company (referred to as “SpinCo”). The stock of SpinCo will be distributed pro rata to Yahoo stockholders, resulting in SpinCo becoming a separate publicly traded registered investment company. Following the completion of the transaction, SpinCo will own all of Yahoo’s remaining 384 million Alibaba Group shares, and Yahoo Small Business, a current operating business of Yahoo that will also be transferred to SpinCo as part of the transaction.

The completion of the transaction is expected to occur in the fourth quarter of 2015 after the expiration of the Company’s lock-up agreement relating to the Alibaba Group shares entered into in connection with the Alibaba Group IPO. The transaction is subject to certain conditions, including final approval by the Company’s Board of Directors, receipt of a favorable ruling from the Internal Revenue Service with respect to certain aspects of the transaction and a legal opinion with respect to the tax-free treatment of the transaction, under U.S. federal tax laws and regulations, the effectiveness of an applicable registration statement with the Securities and Exchange Commission and compliance with the requirements under the Investment Company Act of 1940, and other customary conditions.

The composition of SpinCo’s independent board of directors and management team, and other details of the transaction, including the distribution ratio, will be determined prior to the closing of the transaction.

Upon closing of the transaction, which is subject to the conditions specified above, the Company’s consolidated financial position will be materially impacted as the Alibaba Group shares and related deferred tax liabilities will be removed from the Company’s consolidated balance sheet with a corresponding reduction of its stockholders’ equity balance. The Company would no longer hold any Alibaba Group shares and would no longer record changes in fair value within comprehensive income (loss).

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References+ Details

Foreign Currency Derivative Financial Instruments

3 Months Ended

Mar. 31, 2015

Foreign Currency Derivative Financial Instruments

Note 9 Foreign Currency Derivative Financial Instruments

The Company uses derivative financial instruments, primarily forward contracts, to mitigate risk associated with adverse movements in foreign currency exchange rates.

The Company records all derivatives in the condensed consolidated balance sheets at fair value, with assets included in prepaid expenses and other current assets or other long-term assets, and liabilities included in accrued expenses and other current liabilities or other long-term liabilities. The Company’s accounting treatment for these instruments is based on whether or not the instruments are designated as a hedging instrument. The effective portions of net investment hedges are recorded in other comprehensive income as a part of the cumulative translation adjustment. The effective portions of cash flow hedges are recorded in accumulated other comprehensive income until the hedged item is recognized in revenue on the condensed consolidated statements of income when the underlying hedged revenue is recognized. Any ineffective portions of net investment hedges and cash flow hedges are recorded in other income, net on the Company’s condensed consolidated statements of income. For balance sheet hedges, changes in the fair value are recorded in other income, net on the Company’s condensed consolidated statements of income.

The Company enters into master netting arrangements, which are designed to reduce credit risk by permitting net settlement of transactions with the same counterparty. The Company presents its derivative assets and liabilities at their gross fair values on the condensed consolidated balance sheets. However, under the master netting arrangements with the respective counterparties of the foreign exchange contracts, subject to applicable requirements, the Company is allowed to net settle transactions. The Company is not required to pledge, and is not entitled to receive, cash collateral related to these derivative transactions.

Designated as Hedging Instruments

Net Investment Hedges. The Company hedges, on an after-tax basis, a portion of its net investment in Yahoo Japan with forward contracts and option contracts to reduce the risk that its investment in Yahoo Japan will be adversely affected by foreign currency exchange rate fluctuations. The total of the after-tax net investment hedge was less than the Yahoo Japan investment balance as of both December 31, 2014 and March 31, 2015. As such, the net investment hedge was considered to be effective.

Cash Flow Hedges. The Company entered into foreign currency forward contracts designated as cash flow hedges of varying maturities through December 31, 2015. All of the forward contracts designated as cash flow hedges that were settled were reclassified to revenue during the three months ended March 31, 2014 and 2015, respectively. All current outstanding cash flow hedges are expected to be reclassified into revenue during 2015. For the three months ended March 31, 2014 and 2015, the amounts recorded in other income (expense), net as a result of hedge ineffectiveness and the discontinuance of cash flow hedges because the forecasted transactions were no longer probable of occurring was not material.

Not Designated as Hedging Instruments

Balance Sheet Hedges. The Company hedges certain of its net recognized foreign currency assets and liabilities with foreign exchange forward contracts to reduce the risk that its earnings and cash flows will be adversely affected by changes in foreign currency exchange rates. These derivative instruments hedge assets and liabilities, including intercompany transactions, which are denominated in foreign currencies.

Notional amounts of the Company’s outstanding derivative contracts as of December 31, 2014 and March 31, 2015 were as follows (in millions):


	December 31, 2014		March 31, 2015
Derivatives designated as hedging instruments:
Net investment hedge forward and option contracts	$	1,647	$	1,917
Cash flow hedge forwards	$	222	$	162
Derivatives not designated as hedging instruments:
Balance sheet hedges	$	243	$	281

Foreign currency derivative activity for the three months ended March 31, 2014 was as follows (in millions):


	Beginning Fair Value		Settlement Payment (Receipt)			Gain (Loss) Recorded in Other Income, Net			Gain (Loss) Recorded in Other Comprehensive Income			Gain (Loss) Recorded in Revenue		Ending Fair Value
Derivatives designated as hedging instruments:
Net investment hedges	$	209	$	—		$	—		$	(22	)^(*)	$	—	$	187
Cash flow hedges		4		(1	)		(1	)		(2	)		1		1
Derivatives not designated as hedging instruments:
Balance sheet hedges		—		(1	)		(1	)		—			—		(2	)

(*)

This amount does not reflect the tax impact of $8 million recorded during the three months ended March 31, 2014. The $14 million after tax impact of the loss recorded within other comprehensive income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets.

Foreign currency derivative activity for the three months ended March 31, 2015 was as follows (in millions):


	Beginning Fair Value		Settlement Payment (Receipt)			Gain (Loss) Recorded in Other Income, Net			Gain (Loss) Recorded in Other Comprehensive Income			Gain (Loss) Recorded in Revenue			Ending Fair Value
Derivatives designated as hedging instruments:
Net investment hedges	$	185	$	—		$	—		$	4	^(*)	$	—		$	189
Cash flow hedges		8		(2	)		(1	)		(9	)		(1	)		(5	)
Derivatives not designated as hedging instruments:
Balance sheet hedges		4		(16	)		23			—			—			11

(*)

This amount does not reflect the tax impact of $1 million recorded during the three months ended March 31, 2015. The $3 million after tax impact of the gain recorded within other comprehensive income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets.

Foreign currency derivative contracts balance sheet location and ending fair value was as follows (in millions):


	Balance Sheet Location	December 31, 2014			March 31, 2015
Derivatives designated as hedging instruments:
Net investment hedges	Asset⁽¹⁾	$	190		$	191
	Liability⁽²⁾	$	(5	)	$	(2	)
Cash flow hedges	Asset⁽¹⁾	$	8		$	3
	Liability⁽²⁾	$	—		$	(8	)

Derivatives not designated as hedging instruments:
Balance sheet hedges	Asset⁽¹⁾	$	5		$	11
	Liability⁽²⁾	$	(1	)	$	—

(1)	Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets.

(2)	Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Credit Agreement

3 Months Ended

Mar. 31, 2015

Credit Agreement

Note 10 Credit Agreement

The Company’s credit agreement with Citibank, N.A., as Administrative Agent (as amended, the “Credit Agreement”) provides for a $750 million unsecured revolving credit facility, subject to increase of up to $250 million in accordance with its terms. The Credit Agreement terminates on October 8, 2015, unless extended by the parties. As of March 31, 2015, the Company was in compliance with the financial covenants in the Credit Agreement and no amounts were outstanding.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References+ Details

Convertible Notes

3 Months Ended

Mar. 31, 2015

Convertible Notes

Note 11 Convertible Notes

0.00% Convertible Senior Notes

As of March 31, 2015, the Company had $1.4 billion principal amount of Notes outstanding. The Notes are senior unsecured obligations of Yahoo, the Notes do not bear regular interest, and the principal amount of the Notes does not accrete. The Notes mature on December 1, 2018, unless previously purchased or converted in accordance with their terms prior to such date. The Company may not redeem the Notes prior to maturity. However, holders of the Notes may convert them at certain times and upon the occurrence of certain events in the future, as outlined in the indenture governing the Notes (the “Indenture”). Holders of the Notes who convert in connection with a “make-whole fundamental change,” as defined in the Indenture, may require Yahoo to purchase for cash all or any portion of their Notes at a purchase price equal to 100 percent of the principal amount, plus accrued and unpaid special interest as defined in the Indenture, if any. The Notes are convertible, subject to certain conditions, into shares of Yahoo common stock at an initial conversion rate of 18.7161 shares per $1,000 principal amount of Notes (which is equivalent to an initial conversion price of approximately $53.43 per share), subject to adjustment upon the occurrence of certain events. Upon conversion of the Notes, holders will receive cash, shares of Yahoo’s common stock or a combination thereof, at Yahoo’s election. The Company’s intent is to settle the principal amount of the Notes in cash upon conversion. If the conversion value exceeds the principal amount, the Company would deliver shares of its common stock with respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread). As of March 31, 2015, none of the conditions allowing holders of the Notes to convert had been met.

The Notes consist of the following (in thousands):


	December 31, 2014			March 31, 2015
Liability component:
Principal	$	1,437,500		$	1,437,500
Less: note discount		(267,077	)		(251,620	)

Net carrying amount	$	1,170,423		$	1,185,880

Equity component ^(*)	$	305,569		$	305,569

(*)	Recorded on the condensed consolidated balance sheets within additional paid-in capital.

The following table sets forth total interest expense recognized related to the Notes (in thousands):


	Three Months Ended March 31, 2014		Three Months Ended March 31, 2015
Accretion of convertible note discount	$	14,666	$	15,457

The fair value of the Notes, which was determined based on inputs that are observable in the market (Level 2), and the carrying value of debt instruments (carrying value excludes the equity component of the Notes classified in equity) was as follows (in thousands):


	December 31, 2014				March 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Convertible senior notes	$	1,175,240	$	1,170,423	$	1,217,250	$	1,185,880

Commitments And Contingencies

3 Months Ended

Mar. 31, 2015

Commitments And Contingencies

Note 12 Commitments And Contingencies

Lease Commitments. The Company leases office space and data centers under operating and capital lease agreements with original lease periods of up to 12 years which expire between 2015 and 2025.

A summary of gross and net lease commitments as of March 31, 2015 was as follows (in millions):


	Gross Operating Lease Commitments		Sublease Income			Net Operating Lease Commitments
Nine months ending December 31, 2015	$	104	$	(13	)	$	91
Years ending December 31,
2016		109		(11	)		98
2017		81		(8	)		73
2018		58		(6	)		52
2019		47		(3	)		44
2020		34		(1	)		33
Due after 5 years		108		(2	)		106

Total gross and net lease commitments	$	541	$	(44	)	$	497


	Capital Lease Commitment
Nine months ending December 31, 2015	$	14
Years ending December 31,
2016		15
2017		10
2018		9
2019		5
2020		—
Due after 5 years		—

Gross lease commitment	$	53

Less: interest		(9	)

Net lease commitment included in capital lease and other long-term liabilities	$	44

Affiliate Commitments. The Company is obligated to make payments, which represent traffic acquisition costs (“TAC”), to its Affiliates. As of March 31, 2015, these commitments totaled $1,962 million, of which $380 million will be payable in the remainder of 2015, $401 million will be payable in 2016, $400 million will be payable in 2017, $375 million will be payable in 2018, $375 million will be payable in 2019, and $31 million will be payable thereafter.

Non-cancelable Obligations. The Company is obligated to make payments under various non-cancelable arrangements with vendors and other business partners, principally for marketing, bandwidth, co-location, and content arrangements. As of March 31, 2015, these commitments totaled $202 million, of which $92 million will be payable in the remainder of 2015, $77 million will be payable in 2016, $20 million will be payable in 2017, $11 million will be payable in 2018, and $2 million will be payable in 2019.

Intellectual Property Rights. The Company is committed to make certain payments under various intellectual property arrangements of up to $20 million through 2023.

Other Commitments. In the ordinary course of business, the Company may provide indemnifications of varying scope and terms to customers, vendors, lessors, joint ventures and business partners, purchasers of assets or subsidiaries and other parties with respect to certain matters, including, but not limited to, losses arising out of the Company’s breach of agreements or representations and warranties made by the Company, services to be provided by the Company, intellectual property infringement claims made by third parties or, with respect to the sale, lease, or assignment of assets, or the sale of a subsidiary, matters related to the Company’s conduct of the business and tax matters prior to the sale, lease or assignment. In addition, the Company has entered into indemnification agreements with its directors and certain of its officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The Company has also agreed to indemnify certain former officers, directors, and employees of acquired companies in connection with the acquisition of such companies. The Company maintains director and officer insurance, which may cover certain liabilities arising from its obligation to indemnify its current and former directors and officers, and former directors and officers of acquired companies, in certain circumstances. It is not possible to determine the aggregate maximum potential loss under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Such indemnification agreements might not be subject to maximum loss clauses. Historically, the Company has not incurred material costs as a result of obligations under these agreements and it has not accrued any material liabilities related to such indemnification obligations in the Company’s condensed consolidated financial statements.

As of March 31, 2015, the Company did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Accordingly, the Company is not exposed to any financing, liquidity, market, or credit risk that could arise if the Company had such relationships. In addition, the Company identified no variable interests currently held in entities for which it is the primary beneficiary.

See Note 17—“Search Agreement with Microsoft Corporation” for a description of the Search Agreement and License Agreement with Microsoft.

Legal Contingencies

General. The Company is regularly involved in claims, suits, government investigations, and proceedings arising from the ordinary course of the Company’s business, including actions with respect to intellectual property claims, privacy, consumer protection, information security, data protection or law enforcement matters, tax matters, labor and employment claims, commercial claims, as well as actions involving content generated by users, stockholder derivative actions, purported class action lawsuits, and other matters.

Patent Matters. From time to time, third parties assert patent infringement claims against the Company. Currently, the Company is engaged in lawsuits regarding patent issues and has been notified of other potential patent disputes.

Stockholder and Securities Matters. Since May 31, 2011, several related stockholder derivative suits were filed in the Santa Clara County Superior Court (“California Derivative Litigation”) and the U.S. District Court for the Northern District of California (“Federal Derivative Litigation”) purportedly on behalf of the Company against certain officers and directors of the Company and third parties. The California Derivative Litigation was filed by plaintiffs Cinotto, Lassoff, Zucker, and Koo, and consolidated under the caption In re Yahoo! Inc. Derivative Shareholder Litigation on June 24, 2011 and September 12, 2011. The Federal Derivative Litigation was filed by plaintiffs Salzman, Tawila, and Iron Workers Mid-South Pension Fund and consolidated under the caption In re Yahoo! Inc. Shareholder Derivative Litigation on October 3, 2011. The plaintiffs allege breaches of fiduciary duties, corporate waste, mismanagement, abuse of control, unjust enrichment, misappropriation of corporate assets, or contribution, and seek damages, equitable relief, disgorgement, and corporate governance changes in connection with Alibaba Group’s restructuring of its subsidiary Alipay.com Co., Ltd. (“Alipay”) and related disclosures. On June 7, 2012, the courts approved stipulations staying the California Derivative Litigation pending resolution of the Federal Derivative Litigation, and deferring the Federal Derivative Litigation pending a ruling on the motion to dismiss filed by the defendants in the related stockholder class actions, which are discussed below. On December 16, 2013, the U.S. District Court for the Northern District of California granted the Company’s motion to stay the Federal Derivative Litigation pending resolution of the appeal filed by the plaintiffs in the related stockholder class actions.

Since June 6, 2011, two purported stockholder class actions were filed in the U.S. District Court for the Northern District of California against the Company and certain officers and directors of the Company by plaintiffs Bonato and the Twin Cities Pipe Trades Pension Trust. In October 2011, the District Court consolidated the two actions under the caption In re Yahoo! Inc. Securities Litigation and appointed the Pension Trust Fund for Operating Engineers as lead plaintiff. In a consolidated amended complaint filed December 15, 2011, the lead plaintiff purports to represent a class of investors who purchased the Company’s common stock between April 19, 2011 and July 29, 2011, and alleges that during that class period, defendants issued statements that were materially false or misleading because they did not disclose information relating to Alibaba Group’s restructuring of Alipay. The complaint purports to assert claims for relief for violation of Section 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and for violation of Rule 10b-5 thereunder, and seeks unspecified damages, injunctive and equitable relief, fees, and costs. On August 10, 2012, the court granted defendants’ motion to dismiss the consolidated amended complaint. Plaintiffs have appealed.

On April 22, 2015, a stockholder action captioned Cathy Buch v. David Filo, et al., was filed in the Delaware Court of Chancery against Yahoo and all current members of the Board of Directors. The complaint asserts both derivative claims, purportedly on behalf of Yahoo, and class action claims, purportedly on behalf of the plaintiff and all similarly situated stockholders, relating to the termination of, and severance payments made to, our former chief operating officer, Henrique de Castro. The plaintiff alleges that the board members breached their fiduciary duties by enabling or acquiescing in the payment of severance to Mr. de Castro, and by allowing Yahoo to make allegedly false and misleading statements regarding the value of his severance. The plaintiff has also asserted claims against Mr. de Castro. The plaintiff seeks to recoup the severance paid to Mr. de Castro, an equitable accounting, disgorgement in favor of Yahoo, monetary damages, declaratory relief, injunctive relief, and an award of attorneys’ fees and costs.

Mexico Matters. On November 16, 2011, plaintiffs Worldwide Directories, S.A. de C.V. (“WWD”), and Ideas Interactivas, S.A. de C.V. (“Ideas”) filed an action in the 49th Civil Court of Mexico against the Company, Yahoo! de Mexico, S.A. de C.V. (“Yahoo! Mexico”), Yahoo International Subsidiary Holdings, Inc., and Yahoo Hispanic Americas LLC. The complaint alleged claims of breach of contract, breach of promise, and lost profits in connection with various commercial contracts entered into among the parties between 2002 and 2004, relating to a business listings service, and alleged total damages of approximately $2.75 billion. On December 7, 2011, Yahoo! Mexico filed a counterclaim against WWD for payments of approximately $2.6 million owed to Yahoo! Mexico for services rendered. On April 10, 2012, plaintiffs withdrew their claim filed against Yahoo International Subsidiary Holdings, Inc. and Yahoo Hispanic Americas LLC.

On November 28, 2012, the 49th Civil Court of Mexico entered a non-final judgment against the Company and Yahoo! Mexico in the amount of USD $2.75 billion and a non-final judgment in favor of Yahoo! Mexico on its counterclaim against WWD in the amount of $2.6 million. The judgment against the Company and Yahoo! Mexico purported to leave open for determination in future proceedings certain other alleged damages that were not quantified in the judgment.

On December 12, 2012 and December 13, 2012, respectively, Yahoo! Mexico and the Company appealed the judgment to a three-magistrate panel of the Superior Court of Justice for the Federal District (the “Superior Court”). On May 15, 2013, the Superior Court reversed the judgment, overturned all monetary awards against the Company and reduced the monetary award against Yahoo! Mexico to $172,500. The Superior Court affirmed the award of $2.6 million in favor of Yahoo! Mexico on its counterclaim.

Plaintiffs appealed the Superior Court’s decision to the Mexican Federal Civil Collegiate Court for the First Circuit (“Civil Collegiate Court”). The Company appealed the Superior Court’s decision not to award it statutory costs in the underlying proceeding. Yahoo! Mexico appealed the Superior Court’s award of $172,500, the Superior Court’s decision not to award it additional moneys beyond the $2.6 million award on its counterclaims, and the Superior Court’s decision not to award it statutory costs. On January 14, 2015, the Civil Collegiate Court denied all of the appeals.

On February 16, 2015, plaintiffs filed a petition for review by the Supreme Court of Mexico, where review is limited to constitutional questions under Mexican law. The plaintiff’s petition was denied. Plaintiffs are seeking to reverse the denial through further review by the Supreme Court of Mexico. The Company believes there is no basis to reverse the denial in the matter; however, we cannot assure the ultimate outcome of the matter.

On September 10, 2014, the same plaintiffs in the Mexico litigation described above filed an action in U.S. District Court for the Southern District of New York against Yahoo! Inc., Yahoo! Mexico, Baker & McKenzie, and Baker & McKenzie, S.C. Plaintiffs allege that defendants conspired to influence the Mexican courts and “illegally obtain a favorable judgment” in the above litigation. Plaintiffs advance claims for relief under the Racketeer Influenced and Corrupt Organizations Act of 1970 (“RICO”), which provides for treble damages in certain cases, conspiracy to violate RICO, common-law fraud, and civil conspiracy. Their operative amended complaint seeks unspecified damages. The Company and Yahoo! Mexico have filed a motion to dismiss the amended complaint. The Company believes the plaintiffs’ claims in this action are without merit.

The Company has determined, based on current knowledge, that the amount or range of reasonably possible losses, including reasonably possible losses in excess of amounts already accrued, is not reasonably estimable with respect to certain matters described above. The Company has also determined, based on current knowledge, that the aggregate amount or range of losses that are estimable with respect to the Company’s legal proceedings, including the matters described above other than the Mexico matters, would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Amounts accrued as of March 31, 2015 were not material. The Company did not accrue for the judgment in Mexico, which was reversed as explained above. The ultimate outcome of legal proceedings involves judgments, estimates and inherent uncertainties, and cannot be predicted with certainty. In the event of a determination adverse to Yahoo, its subsidiaries, directors, or officers in these matters, the Company may incur substantial monetary liability, and be required to change its business practices. Either of these events could have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company may also incur substantial legal fees, which are expensed as incurred, in defending against these claims.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Stockholders' Equity And Employee Benefits

3 Months Ended

Mar. 31, 2015

Stockholders' Equity And Employee Benefits

Note 13 Stockholders’ Equity And Employee Benefits

Stock Options. The Company’s Stock Plan, the Directors’ Plan, and stock-based awards assumed through acquisitions (including stock-based commitments related to continued service of acquired employees, such as the holdback by Yahoo of shares of Yahoo common stock issued to Tumblr’s founder in connection with the Company’s acquisition of Tumblr in June 2013) are collectively referred to as the “Plans.” Stock option activity under the Company’s Plans for the three months ended March 31, 2015 is summarized as follows (in thousands, except per share amounts):


	Shares			Weighted Average Exercise Price Per Share
Outstanding at December 31, 2014⁽¹⁾		9,225		$	18.57
Options granted		—		$	—
Options assumed in acquisitions		—		$	—
Options exercised⁽²⁾		(584	)	$	16.41
Options expired		(530	)	$	18.95
Options cancelled/forfeited		(49	)	$	13.50

Outstanding at March 31, 2015⁽¹⁾		8,062		$	18.73

⁽¹⁾	Includes shares subject to performance-based stock options for which performance goals had not been set as of the date shown.

⁽²⁾	The Company generally issues new shares to satisfy stock option exercises.

As of March 31, 2015, there was $48 million of unamortized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted average period of 1.7 years.

The fair value of option grants is determined using the Black-Scholes option pricing model with the following weighted average assumptions:


	Stock Options			Purchase Plan
	Three Months Ended			Three Months Ended
	March 31, 2014			March 31, 2014
Expected dividend yield		0.0	%		0.0	%
Risk-free interest rate		1.5	%		0.1	%
Expected volatility		36.2	%		38.7	%
Expected life (in years)		4.00			0.24

Restricted Stock Units

Restricted stock unit activity under the Plans for the three months ended March 31, 2015 is summarized as follows (in thousands, except per share amounts):


	Shares			Weighted Average Grant Date Fair Value Per Share
Awarded and unvested at December 31, 2014⁽¹⁾		40,677		$	32.38
Granted⁽²⁾		11,634		$	43.83
Assumed in acquisitions		—		$	—
Vested		(5,655	)	$	26.20
Forfeited		(3,508	)	$	30.83

Awarded and unvested at March 31, 2015⁽¹⁾		43,148		$	36.41

⁽¹⁾	Includes the maximum number of shares issuable under the Company’s performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown.

⁽²⁾

Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the three months ended March 31, 2015 (including future-year tranches for which performance goals had not been set during the period); excludes tranches of previously granted performance-based restricted stock units for which performance goals were set during the three months ended March 31, 2015.

As of March 31, 2015, there was $969 million of unamortized stock-based compensation expense related to unvested restricted stock and restricted stock units, which is expected to be recognized over a weighted average period of 2.6 years.

During the three months ended March 31, 2014 and 2015, 8.5 million shares and 5.7 million shares, respectively, that were subject to previously granted restricted stock units vested. These vested restricted stock units were net share settled. During the three months ended March 31, 2014 and 2015, the Company withheld 3.3 million shares and 2.2 million shares, respectively, based upon the Company’s closing stock price on the vesting date, to satisfy the Company’s tax withholding obligation relating to the employees’ minimum statutory obligation for the applicable income and other employment taxes. The Company then remitted cash to the appropriate taxing authorities.

Total payments for the employees’ tax obligations to the relevant taxing authorities were $125 million and $97 million, respectively, for the three months ended March 31, 2014 and 2015 and are reflected as a financing activity within the condensed consolidated statements of cash flows. The payments were used for tax withholdings related to the net share settlements of restricted stock units. The payments had the effect of share repurchases by the Company as they reduced the number of shares that would have otherwise been issued on the vesting date and were recorded as a reduction of additional paid-in capital.

Performance Options. The financial performance stock options awarded by the Company in November 2012 to Ms. Mayer and Mr. Goldman include multiple performance periods. The number of stock options that ultimately vest for each performance period will range from 0 percent to 100 percent of the target amount for such period stated in each executive’s award agreement based on the Company’s performance relative to goals. The financial performance goals are established at the beginning of each performance period and the portion (or “tranche”) of the award related to each performance period is treated as a separate grant for accounting purposes. In March 2015, the Compensation Committee established performance goals under these stock options for the 2015 performance year. The 2015 financial performance metrics (and their weightings) under the performance stock options are GAAP revenue (one-third), revenue ex-TAC (one-third), and adjusted EBITDA (one-third). The grant date fair value of the 2015 tranche of the November 2012 financial performance stock options was $31 million, and is being recognized over the twelve-month service period. The Company began recording stock-based compensation expense for this tranche in March 2015, when the financial performance goals were established.

Performance RSUs. In March 2015, the Compensation Committee approved additional annual financial performance-based restricted stock unit (“RSU”) awards to Ms. Mayer and other senior officers, and established the 2015 annual performance goals for these awards as well as for the similar performance-based RSUs granted in February 2013 and February 2014. The 2013, 2014, and 2015 performance-based RSU awards are generally eligible to vest in equal annual target amounts over four years (three years for Ms. Mayer) based on the Company’s attainment of annual financial performance goals as well as the executive’s continued employment through each vesting date. The number of shares that ultimately vest each year will range from 0 percent to 200 percent of the annual target amount, based on the Company’s performance. Annual financial performance metrics and goals are established for these RSU awards at the beginning of each year and the tranche of each RSU award related to that year’s performance goal is treated as a separate annual grant for accounting purposes. The 2015 financial performance metrics (and their weightings) established for the performance RSUs are: GAAP revenue (one-third), revenue ex-TAC (one-third), and adjusted EBITDA (one-third). The grant date fair value of the first tranche of the March 2015 performance RSUs was $9 million, the grant date fair value of the second tranche of the February 2014 performance RSUs was $11 million, and the grant date fair value of the third tranche of the February 2013 performance RSUs was $19 million. These values are being recognized over the tranches’ twelve-month service periods. The Company began recording stock-based compensation expense for these tranches in March 2015, when the financial performance goals were established.

Stock Repurchases. In May 2012, the Board authorized a stock repurchase program allowing the Company to repurchase up to $5 billion of its outstanding shares of common stock. That repurchase program was exhausted during the first quarter of 2014. In November 2013, the Board authorized an additional stock repurchase program with an authorized level of $5 billion. The November 2013 program, according to its terms, will expire in December 2016. The aggregate amount available under the November 2013 repurchase program was approximately $726 million at March 31, 2015. In March 2015, the Board authorized an additional stock repurchase program with an authorized level of $2 billion. The March 2015 program, according to its terms, will expire in March 2018. The aggregate amount available under the March 2015 repurchase program was $2 billion at March 31, 2015. Repurchases under the repurchase programs may take place in the open market or in privately negotiated transactions, including structured and derivative transactions such as accelerated share repurchase transactions, and may be made under a Rule 10b5-1 plan. During the three months ended March 31, 2015, the Company repurchased approximately 4 million shares of its common stock under its stock repurchase programs at an average price of $47.65 per share for a total of $204 million.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References+ Details

Restructuring Charges, Net

3 Months Ended

Mar. 31, 2015

Restructuring Charges, Net

Note 14 Restructuring Charges, Net

Restructuring charges, net was comprised of the following (in thousands):


	Three Months Ended
	March 31, 2014			March 31, 2015
Employee severance pay and related costs	$	3,591		$	44,000
Non-cancelable lease, contract termination, and other charges		6,532			8,617
Reversals of previous charges		(636	)		(3,231	)
Non-cash accelerations of stock-based compensation expense		—			2,705
Other non-cash credits		—			(859	)

Restructuring charges, net	$	9,487		$	51,232

The Company has implemented various restructuring plans to reduce its cost structure, align resources with its product strategy and improve efficiency, which have resulted in workforce reductions and the consolidation of certain real estate facilities and data centers. For the three months ended March 31, 2014, the Company recorded expense of $5 million and $4 million related to the Americas and EMEA segments, respectively. For the three months ended March 31, 2015, the Company recorded expense of $41 million, $7 million, and $3 million related to the Americas, EMEA, and Asia Pacific segments, respectively. The amounts recorded during the three months ended March 31, 2015 were primarily related to severance and other related costs pursuant to a restructuring plan initiated by the Company in 2015.

The Company’s restructuring accrual activity for the three months ended March 31, 2015 is summarized as follows (in thousands):


Accrual balance as of December 31, 2014	$	83,608
Restructuring charges		51,232
Cash paid		(35,287	)
Non-cash accelerations of stock-based compensation expense		(2,705	)
Foreign currency translation and other adjustments		275

Accrual balance as of March 31, 2015	$	97,123

The $97 million restructuring liability as of March 31, 2015 consisted of $34 million for employee severance pay expenses, which the Company expects to pay out by the end of the third quarter of 2015, and $63 million relating to non-cancelable lease costs, which the Company expects to pay over the terms of the related obligations through the first quarter of 2019, less estimated sublease income.

Restructuring accruals by segment consisted of the following (in thousands):


	December 31, 2014		March 31, 2015
Americas	$	65,949	$	79,393
EMEA		16,797		14,927
Asia Pacific		862		2,803

Total restructuring accruals	$	83,608	$	97,123

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Income Taxes

3 Months Ended

Mar. 31, 2015

Income Taxes

Note 15 Income Taxes

The Company’s effective tax rate is the result of the mix of income earned in various tax jurisdictions that apply a broad range of income tax rates. Historically, the Company’s provision for income taxes has differed from the tax computed at the U.S. federal statutory income tax rate due to state taxes, the effect of non-U.S. operations, non-deductible stock-based compensation expense, non-deductible acquisition-related costs and adjustments to unrecognized tax benefits.

The effective tax rate reported for the three months ended March 31, 2015 was 35 percent compared to 25 percent for the same period in 2014. The rate in the period ended March 31, 2015 was equal to the U.S. federal statutory tax rate after an increase for non-deductible stock-based compensation expense and non-deductible acquisition-related costs, which was fully offset by foreign tax credits available for use. The rate in the period ended March 31, 2014 was lower than the U.S. federal statutory rate due to a reduction of tax reserves that was recorded as tax audit issues were favorably settled.

As of March 31, 2015, the Company does not anticipate repatriating its undistributed foreign earnings of approximately $3.0 billion. Those earnings are principally related to its equity method investment in Yahoo Japan. If those earnings were to be repatriated in the future, the Company may be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits). It is not practicable to determine the income tax liability that might be incurred if these earnings were to be repatriated.

The Company’s gross amount of unrecognized tax benefits as of March 31, 2015 was $1,019 million, of which $966 million is recorded on the condensed consolidated balance sheets. The gross unrecognized tax benefits as of March 31, 2015 decreased by $4 million from the recorded balance as of December 31, 2014.

The Company is in various stages of examination and appeal in connection with its taxes both in the U.S. and in foreign jurisdictions. Those audits generally span tax years 2005 through 2013. As of March 31, 2015, the Company’s 2011 and 2012 U.S. federal income tax returns are currently under examination. The Company has protested the proposed California Franchise Tax Board’s adjustments to the 2005 through 2008 returns, but no conclusions have been reached to date. While it is difficult to determine when the examinations will be settled or their final outcomes, certain audits in various jurisdictions related to multinational income tax issues are expected to be resolved in the foreseeable future. As a result, it is reasonably possible that the Company’s unrecognized tax benefits could be reduced by up to approximately $154 million in the next twelve months. The Company believes that it has adequately provided for any reasonably foreseeable adjustment and that any settlement will not have a material adverse effect on its consolidated financial position, results of operations, or cash flows.

The Company may have additional tax liabilities in China related to the sale to Alibaba Group of 523 million Alibaba Group shares that took place during the year ended December 31, 2012 and related to the sale of the 140 million Alibaba Group ADSs sold in the Alibaba Group IPO that took place during the year ended December 31, 2014. Any taxes assessed and paid in China are expected to be ultimately offset and recovered in the U.S. through the use of foreign tax credits with respect to the sale in 2012. Any taxes assessed and paid in China are expected to be ultimately offset and recovered in the U.S. with respect to the sale in 2014 through the use of foreign tax credits to the extent there is sufficient foreign source income.

Tax authorities from the Brazilian State of Sao Paulo have assessed certain indirect taxes against the Company’s Brazilian subsidiary, Yahoo! do Brasil Internet Ltda., related to online advertising services. The assessment is for calendar years 2008 through 2011 and, translated into U.S. dollars as of March 31, 2015, totals approximately $105 million. The Company currently believes the assessment is without merit. The Company believes the risk of loss is remote and has not recorded an accrual for the assessment.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Segments

3 Months Ended

Mar. 31, 2015

Segments

Note 16 Segments

The Company continues to manage its business geographically. The primary areas of measurement and decision-making are Americas, EMEA (Europe, Middle East, and Africa), and Asia Pacific. Management relies on an internal reporting process that provides revenue ex-TAC, which is defined as revenue less TAC, direct costs excluding TAC by segment, and consolidated income from operations for making decisions related to the evaluation of the financial performance of, and allocating resources to, the Company’s segments.

The following tables present summarized information by segment (in thousands):


	Three Months Ended
	March 31, 2014		March 31, 2015
Revenue by segment:
Americas	$	866,928	$	984,721
EMEA		91,570		81,086
Asia Pacific		174,232		160,163

Total Revenue	$	1,132,730	$	1,225,970

TAC by segment:
Americas	$	34,094	$	166,655
EMEA		9,193		11,704
Asia Pacific		2,622		4,780

Total TAC	$	45,909	$	183,139

Revenue ex-TAC by segment:
Americas	$	832,834	$	818,066
EMEA		82,377		69,382
Asia Pacific		171,610		155,383

Total Revenue ex-TAC		1,086,821		1,042,831

Direct costs by segment⁽¹⁾ :
Americas		59,688		55,730
EMEA		21,669		19,898
Asia Pacific		46,820		50,712
Global operating costs⁽²⁾		652,263		687,382
Gain on sale of patents		—		(2,000	)
Depreciation and amortization		157,534		151,535
Stock-based compensation expense		109,181		115,696
Restructuring charges, net		9,487		51,232

Income (loss) from operations	$	30,179	$	(87,354	)

(1)

Direct costs for each segment include certain cost of revenue-other and costs associated with the local sales teams. Prior to the fourth quarter of 2014, marketing, media, costs associated with Yahoo Properties and ad operation costs were managed locally and included as direct costs for each segment. Such costs are now included in global operating costs. Prior period amounts have been revised to conform to the current presentation.

(2)

Global operating costs include product development, marketing, real estate workplace, general and administrative, and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment. Beginning in the fourth quarter of 2014, marketing, media, costs associated with Yahoo Properties and other ad operation costs are managed globally and included as global costs. Prior period amounts have been revised to conform to the current presentation.


	Three Months Ended
	March 31, 2014		March 31, 2015
Capital expenditures, net:
Americas	$	63,977	$	122,382
EMEA		15,762		7,653
Asia Pacific		4,916		4,886

Total capital expenditures, net	$	84,655	$	134,921


	December 31, 2014		March 31, 2015
Property and equipment, net:
Americas:
U.S.	$	1,382,597	$	1,381,676
Other		787		628

Total Americas	$	1,383,384	$	1,382,304

EMEA		34,649		35,408
Asia Pacific		69,651		66,060

Total property and equipment, net	$	1,487,684	$	1,483,772

See Note 5 — “Goodwill” and Note 14 — “Restructuring Charges, Net” for additional information regarding segments.

Enterprise Wide Disclosures

The following table presents revenue for groups of similar services (in thousands):


	Three Months Ended
	March 31, 2014		March 31, 2015
Search	$	444,767	$	531,666
Display		453,224		463,733
Other		234,739		230,571

Total revenue	$	1,132,730	$	1,225,970



	Three Months Ended

	March 31, 2014		March 31, 2015
Revenue:
U.S.	$	833,658	$	963,511
International		299,072		262,459

Total revenue	$	1,132,730	$	1,225,970

Revenue is attributed to individual countries according to the online property that generated the revenue. No single foreign country was material to revenue for the three months ended March 31, 2014 and 2015.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Search Agreement With Microsoft Corporation

3 Months Ended

Mar. 31, 2015

Search Agreement With Microsoft Corporation

Note 17 Search Agreement With Microsoft Corporation

On December 4, 2009, the Company entered into the Search Agreement with Microsoft. On February 18, 2010, the Company received regulatory clearance from both the U.S. Department of Justice and the European Commission and on February 23, 2010 the Company commenced implementation of the Search Agreement on a market-by-market basis.

On April 15, 2015, the Company and Microsoft entered into the Eleventh Amendment to the Search Agreement (the “Eleventh Amendment”) pursuant to which the terms of the Search Agreement were amended. Previously under the Search Agreement, Microsoft was the exclusive algorithmic and paid search services provider to Yahoo on personal computers for Yahoo Properties and for search services provided by Yahoo to Affiliate Sites. Microsoft was the non-exclusive provider on mobile devices. Pursuant to the Eleventh Amendment, Microsoft will provide such services on a non-exclusive basis for Yahoo Properties and Affiliate sites on personal computers. Commencing on May 1, 2015, Yahoo agrees to request paid search results from Microsoft for 51 percent of its search queries originating from personal computers accessing Yahoo Properties and its Affiliate sites (the “Volume Commitment”) and will display only Microsoft’s paid search results on such search result pages.

Previously under the Search Agreement, the Company was entitled to receive a percentage of the revenue (the “Revenue Share Rate”) generated from Microsoft’s services on Yahoo Properties and on Affiliate sites after deduction of the Affiliate sites’ share of revenue and certain Microsoft costs. The Revenue Share Rate was 88 percent for the first five years of the Search Agreement and then increased to 90 percent on February 23, 2015. Pursuant to the Eleventh Amendment, the Revenue Share Rate increased to 93 percent, but Microsoft now receives its 7 percent share before deduction of the Affiliate site’s share of revenue.

Additionally, pursuant to the Eleventh Amendment, the Company will now have the ability in response to queries on both personal computers and mobile to request algorithmic listings only, paid listings only or both algorithmic and paid listings from Microsoft. To the extent the Company requests algorithmic listings only or requests paid listings but elects not to display such paid listings, the Company will pay Microsoft serving costs but not a revenue share. In other cases and with respect to the Volume Commitment, the Revenue Share Rate will apply.

Previously under the Search Agreement, Yahoo had sales exclusivity for both the Company’s and Microsoft’s premium advertisers. Pursuant to the Eleventh Amendment, this sales exclusivity will terminate on July 1, 2015. The Company and Microsoft will develop a plan to transition premium advertisers for Microsoft’s paid search services to Microsoft commencing on July 1, 2015 and to be completed by January 31, 2016.

The term of the Search Agreement remains 10 years from its commencement date, February 23, 2010, subject to earlier termination as provided in the Search Agreement. Pursuant to the Eleventh Amendment, on or after October 1, 2015, either the Company or Microsoft may terminate the Search Agreement by delivering a written notice of termination to the other party. The Search Agreement will remain in effect for four months from the date of the termination notice to provide for a transition period, however, the Company’s Volume Commitment will not apply in the third and fourth months of this transition period.

The Company reports as revenue the revenue share it receives from Microsoft under the Search Agreement as the Company is not the primary obligor in the arrangement with the advertisers and publishers. The underlying search advertising services are provided by Microsoft. Approximately 36 percent and 39 percent of the Company’s revenue for the three months ended March 31, 2014 and 2015, respectively, was attributable to the Search Agreement.

Under the Search Agreement, Microsoft continues to be obligated to guarantee Yahoo’s revenue per search on Yahoo Properties in Taiwan and Hong Kong for 18 months after the transition of paid search services to Microsoft’s platform in those markets, which was completed during the fourth quarter of 2013. This guarantee will expire during the second quarter of 2015.

As of December 31, 2014 and March 31, 2015, the Company had collected total amounts of $52 million and $8 million, respectively, on behalf of Microsoft and Affiliates, which was included in cash and cash equivalents with a corresponding liability in accrued expenses and other current liabilities. The Company’s uncollected revenue share in connection with the Search Agreement was $330 million and $296 million, which is included in accounts receivable, net, as of December 31, 2014 and March 31, 2015, respectively. There were no amounts classified as a part of prepaid expenses and other current assets on our condensed consolidated balance sheets as of December 31, 2014 and March 31, 2015 related to reimbursements not yet received from Microsoft.

On December 9, 2010, in connection with entering into the Search Agreement, the Company also entered into a License Agreement with Microsoft (as amended, the “License Agreement. Under the License Agreement, Microsoft acquired an exclusive 10-year license to the Company’s core search technology and has the ability to integrate this technology into its existing Web search platforms. Pursuant to the Eleventh Amendment, the exclusive licenses granted to Microsoft under the License Agreement became non-exclusive. The Company also agreed pursuant to the Eleventh Amendment to license certain sales tools to Microsoft to use solely in connection with Microsoft’s paid search services pursuant to the terms of the License Agreement.

The Company And Summary Of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Basis of Presentation	*Basis of Presentation*. The condensed consolidated financial statements include the accounts of Yahoo! Inc. and its majority-owned or otherwise controlled subsidiaries. All significant intercompany accounts and transactions have been eliminated. Investments in entities in which the Company can exercise significant influence, but does not own a majority equity interest or otherwise control, are accounted for using the equity method and are included as investments in equity interests on the condensed consolidated balance sheets. The Company has included the results of operations of acquired companies from the date of the acquisition. Beginning in the three months ended March 31, 2015, the Company classifies editorial costs as cost of revenue — other rather than including such costs in sales and marketing expense. To conform to the current period presentation, the Company reclassified $13 million in certain website editorial costs previously included in sales and marketing expense to cost of revenue — other for the three months ended March 31, 2014. Also, beginning in the three months ended March 31, 2015, the Company classifies non-datacenter facilities-related costs within general and administrative expense. To conform to the current period presentation, the Company reclassified $13 million in facilities-related costs previously included in product development expense and $15 million previously included in sales and marketing expense to general and administrative expense for the three months ended March 31, 2014. Certain prior period amounts have been reclassified to conform to the current period presentation. The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of only normal recurring items, which, in the opinion of management, are necessary for a fair statement of the results of operations for the periods shown. The results of operations for such periods are not necessarily indicative of the results expected for the full year or for any future periods. The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses and the related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, the useful lives of long-lived assets including property and equipment and intangible assets, investment fair values, stock-based compensation, goodwill, income taxes, contingencies, and restructuring charges. The Company bases its estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, when these carrying values are not readily available from other sources. Actual results may differ from these estimates. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed consolidated balance sheet as of December 31, 2014 was derived from the Company’s audited financial statements for the year ended December 31, 2014, but does not include all disclosures required by U.S. GAAP. However, the Company believes the disclosures are adequate to make the information presented not misleading.
Cost of revenue - TAC	*Cost of revenue — TAC*. TAC consists of payments made to third parties that have integrated the Company’s advertising offerings into their Websites or other offerings and payments made to companies that direct consumer and business traffic to Yahoo Properties. TAC is either recorded as a reduction of revenue or cost of revenue. TAC related to the Company’s Search and Advertising Sales Agreement (as amended, the “Search Agreement”) with Microsoft Corporation (“Microsoft”) is recorded as a reduction of revenue. See Note 17 — “Search Agreement with Microsoft Corporation” for a description of the Search Agreement and License Agreement with Microsoft. TAC related to the Company’s other offerings is recorded as cost of revenue — TAC. The Company also has an agreement to compensate a third party, Mozilla Corporation (“Mozilla”), to make the Company the default search provider on certain of Mozilla’s products in the United States. The Company records these payments as cost of revenue – TAC.
Recent Accounting Pronouncements	*Recent Accounting Pronouncements*. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition” and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments in ASU 2014-09 are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with early application not permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s financial position, results of operations and cash flows.

Marketable Securities, Investments And Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2015

Schedule of Available for Sale Securities

The following tables summarize the available-for-sale securities (in thousands):


	December 31, 2014
	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Government and agency securities	$	850,712	$	82	$	(792	)	$	850,002
Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit		6,711,683		612		(4,653	)		6,707,642
Alibaba Group equity securities		2,713,484		37,154,305		—			39,867,789
Hortonworks equity securities		26,246		77,783		—			104,029
Other corporate equity securities		230		430		—			660

Total available-for-sale marketable securities	$	10,302,355	$	37,233,212	$	(5,445	)	$	47,530,122


	March 31, 2015
	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Government and agency securities	$	817,974	$	392	$	(156	)	$	818,210
Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit		4,908,876		2,012		(1,443	)		4,909,445
Alibaba Group equity securities		2,713,484		29,214,501		—			31,927,985
Hortonworks equity securities		26,246		65,438		—			91,684
Other corporate equity securities		230		448		—			678

Total available-for-sale marketable securities	$	8,466,810	$	29,282,791	$	(1,599	)	$	37,748,002

Schedule of Available for Sale Securities by Balance Sheet Location


	December 31, 2014		March 31, 2015
Reported as:
Short-term marketable securities	$	5,327,412	$	4,109,789
Long-term marketable securities		2,230,892		1,618,544
Investment in Alibaba Group		39,867,789		31,927,985
Other long-term assets and investments		104,029		91,684

Total	$	47,530,122	$	37,748,002

Schedule of Available for Sale Marketable Securities by Contractual Maturities

The remaining contractual maturities of available-for-sale marketable debt securities were as follows (in thousands):


	December 31, 2014		March 31, 2015
Due within one year	$	5,327,412	$	4,109,789
Due after one year through five years		2,230,892		1,618,544

Total available-for-sale marketable debt securities	$	7,558,304	$	5,728,333

Available for Sale Marketable Securities in Unrealized Loss Position


	December 31, 2014
	Less than 12 Months					12 Months or Longer					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Government and agency securities	$	744,948	$	(792	)	$	—	$	—		$	744,948	$	(792	)
Corporate debt securities, commercial paper, and bank certificates of deposit		2,601,288		(4,646	)		3,234		(7	)		2,604,522		(4,653	)

Total available-for-sale marketable debt securities	$	3,346,236	$	(5,438	)	$	3,234	$	(7	)	$	3,349,470	$	(5,445	)


	March 31, 2015
	Less than 12 Months					12 Months or Longer					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Government and agency securities	$	317,476	$	(156	)	$	—	$	—		$	317,476	$	(156	)
Corporate debt securities, commercial paper, and bank certificates of deposit		1,528,735		(1,440	)		8,642		(3	)		1,537,377		(1,443	)

Total available-for-sale marketable debt securities	$	1,846,211	$	(1,596	)	$	8,642	$	(3	)	$	1,854,853	$	(1,599	)

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis

The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of December 31, 2014 (in thousands):


	Fair Value Measurements at Reporting Date Using
Assets	Level 1		Level 2			Level 3		Total
Money market funds⁽¹⁾	$	373,822	$	—		$	—	$	373,822
Available-for-sale marketable debt securities:
Government and agency securities⁽¹⁾		—		850,002			—		850,002
Commercial paper and bank certificates of deposit⁽¹⁾		—		3,602,321			—		3,602,321
Corporate debt securities⁽¹⁾		—		3,327,017			—		3,327,017
Time deposits⁽¹⁾		—		1,361,165			—		1,361,165
Available-for-sale equity securities:
Other corporate equity securities		660		—			—		660
Alibaba Group equity securities		39,867,789		—			—		39,867,789
Hortonworks equity securities⁽²⁾		104,029		—			—		104,029
Hortonworks warrants		—		—			98,062		98,062
Foreign currency derivative contracts⁽³⁾		—		202,928			—		202,928

Financial assets at fair value	$	40,346,300	$	9,343,433		$	98,062	$	49,787,795

Liabilities
Foreign currency derivative contracts⁽³⁾		—		(6,157	)		—		(6,157	)

Total financial assets and liabilities at fair value	$	40,346,300	$	9,337,276		$	98,062	$	49,781,638

The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of March 31, 2015 (in thousands):


	Fair Value Measurements at Reporting Date Using
Assets	Level 1		Level 2			Level 3		Total
Money market funds⁽¹⁾	$	465,991	$	—		$	—	$	465,991
Available-for-sale marketable debt securities:
Government and agency securities⁽¹⁾		—		818,210			—		818,210
Commercial paper and bank certificates of deposit⁽¹⁾		—		1,983,908			—		1,983,908
Corporate debt securities⁽¹⁾		—		2,901,525			—		2,901,525
Time deposits⁽¹⁾		—		90,857			—		90,857
Available-for-sale equity securities:
Other corporate equity securities		678		—			—		678
Alibaba Group equity securities		31,927,985		—			—		31,927,985
Hortonworks equity securities⁽²⁾		91,684		—			—		91,684
Hortonworks warrants		—		—			86,153		86,153
Foreign currency derivative contracts⁽³⁾		—		205,406			—		205,406

Financial assets at fair value	$	32,486,338	$	5,999,906		$	86,153	$	38,572,397

Liabilities
Foreign currency derivative contracts⁽³⁾		—		(9,846	)		—		(9,846	)

Total financial assets and liabilities at fair value	$	32,486,338	$	5,990,060		$	86,153	$	38,562,551

(1)

(2)	The Hortonworks equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets.

(3)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References+ Details

Consolidated Financial Statement Details (Tables)

3 Months Ended

Mar. 31, 2015

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income were as follows (in thousands):


	December 31, 2014			March 31, 2015
Unrealized gains on available-for-sale securities, net of tax	$	22,086,371		$	17,373,280
Unrealized gains (losses) on cash flow hedges, net of tax		445			(9,496	)
Foreign currency translation, net of tax		(67,188	)		(335,796	)

Accumulated other comprehensive income	$	22,019,628		$	17,027,988

Noncontrolling Interests

Noncontrolling interests were as follows (in thousands):


	December 31, 2014			March 31, 2015
Beginning noncontrolling interests	$	55,688		$	43,755
Distributions to noncontrolling interests		(22,344	)		—
Net income attributable to noncontrolling interests		10,411			975

Ending noncontrolling interests	$	43,755		$	44,730

Other Expense, Net

Other expense, net was as follows (in thousands):


	Three Months Ended
	March 31, 2014			March 31, 2015
Interest, dividend and investment income	$	5,437		$	8,845
Interest expense		(17,081	)		(17,570	)
Loss on Hortonworks warrants		—			(11,909	)
Other expense, net		(1,809	)		(10,429	)

Total other expense, net	$	(13,453	)	$	(31,063	)

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2014 were as follows (in thousands):


	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
Realized gains on cash flow hedges, net of tax	$	(454	)	Revenue
Realized gains on available-for-sale securities, net of tax		(12	)	Other income, net

Total reclassifications for the period	$	(466	)

Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2015 were as follows (in thousands):


	Amount Reclassified from Accumulated Other Comprehensive Income		Affected Line Item in the Statement of Income
Realized losses on cash flow hedges, net of tax	$	1,660	Revenue
Realized losses on available-for-sale securities, net of tax		84	Other income, net

Total reclassifications for the period	$	1,744

Goodwill (Tables)

3 Months Ended

Mar. 31, 2015

Schedule Of Goodwill

The changes in the carrying amount of goodwill for the three months ended March 31, 2015 were as follows (in thousands):


	Americas⁽¹⁾			EMEA⁽²⁾			Asia Pacific⁽³⁾		Total
Net balance as of January 1, 2015	$	4,333,957		$	531,815		$	297,882	$	5,163,654
Acquisitions and other		(7,239	)		20,903			—		13,664
Foreign currency translation adjustments		(1,370	)		(36,124	)		446		(37,048	)

Net balance as of March 31, 2015	$	4,325,348		$	516,594		$	298,328	$	5,140,270

(1)	Gross goodwill balance for the Americas segment was $4.3 billion as of March 31, 2015.

(2)	Gross goodwill balance for the EMEA segment was $1.1 billion as of March 31, 2015. The EMEA segment includes accumulated impairment losses of $630 million as of March 31, 2015.

(3)	Gross goodwill balance for the Asia Pacific (“APAC”) segment was $457 million as of March 31, 2015. The APAC segment includes accumulated impairment losses of $159 million as of March 31, 2015.

Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2015

Intangible Assets, Net

The following table summarizes the Company’s intangible assets, net (in thousands):


	December 31, 2014		March 31, 2015
	Net		Gross Carrying Amount		Accumulated Amortization^(*)			Net
Customer, affiliate, and advertiser related relationships	$	281,596	$	375,014	$	(105,631	)	$	269,383
Developed technology and patents		122,674		202,498		(93,068	)		109,430
Trade names, trademarks, and domain names		66,572		107,939		(44,883	)		63,056

Total intangible assets, net	$	470,842	$	685,451	$	(243,582	)	$	441,869

(*)	Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, increased total intangible assets by approximately $17 million as of March 31, 2015.

Basic and Diluted Net Income Attributable to Yahoo! Inc. Common Stockholders Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Computation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):


	Three Months Ended
	March 31, 2014			March 31, 2015
*Basic:*
Numerator:
Net income attributable to Yahoo! Inc.	$	311,578		$	21,198
Less: Net income allocated to participating securities		(3	)		—

Net income attributable to Yahoo! Inc. common stockholders — basic	$	311,575		$	21,198

Denominator:
Weighted average common shares		1,009,890			934,748

Net income attributable to Yahoo! Inc. common stockholders per share — basic	$	0.31		$	0.02

*Diluted:*
Numerator:
Net income attributable to Yahoo! Inc.	$	311,578		$	21,198
Less: Net income allocated to participating securities		(3	)		—
Less: Effect of dilutive securities issued by equity investees		(12,365	)		(1,194	)

Net income attributable to Yahoo! Inc. common stockholders — diluted	$	299,210		$	20,004

Denominator:
Denominator for basic calculation		1,009,890			934,748
Weighted average effect of Yahoo! Inc. dilutive securities:
Restricted stock units		15,670			10,913
Stock options and employee stock purchase plan		5,860			2,315

Denominator for diluted calculation		1,031,420			947,976

Net income attributable to Yahoo! Inc. common stockholders per share — diluted	$	0.29		$	0.02

Investments In Equity Interests Accounted For Using The Equity Method Of Accounting (Tables)

3 Months Ended

Mar. 31, 2015

Investments in Equity Interests Accounted for Using Equity Method of Accounting

The following table summarizes the Company’s investments in equity interests accounted for using the equity method of accounting (dollars in thousands):


	December 31, 2014		Percent Ownership			March 31, 2015		Percent Ownership
Yahoo Japan	$	2,482,660		35.5	%	$	2,339,611		35.5	%
Other		6,918		20	%		6,590		20	%

Total	$	2,489,578				$	2,346,201

Yahoo Japan

Condensed Financial Information


	Three Months Ended
	December 31, 2013		December 31, 2014
	(In thousands)
Operating data:
Revenue	$	1,031,656	$	941,241
Gross profit	$	843,926	$	750,984
Income from operations	$	489,442	$	425,053
Net income	$	307,112	$	286,793
Net income attributable to Yahoo Japan	$	304,345	$	284,846


	September 30, 2014		December 31, 2014
	(In thousands)
Balance sheet data:
Current assets	$	6,161,126	$	5,693,613
Long-term assets	$	1,908,379	$	1,871,194
Current liabilities	$	1,948,540	$	1,725,200
Long-term liabilities	$	35,418	$	33,647
Noncontrolling interests	$	66,998	$	69,634

Foreign Currency Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Notional Amounts of Company's Outstanding Forward Contracts

Notional amounts of the Company’s outstanding derivative contracts as of December 31, 2014 and March 31, 2015 were as follows (in millions):


	December 31, 2014		March 31, 2015
Derivatives designated as hedging instruments:
Net investment hedge forward and option contracts	$	1,647	$	1,917
Cash flow hedge forwards	$	222	$	162
Derivatives not designated as hedging instruments:
Balance sheet hedges	$	243	$	281

Schedule of Foreign Exchange Contracts

Foreign currency derivative activity for the three months ended March 31, 2014 was as follows (in millions):


	Beginning Fair Value		Settlement Payment (Receipt)			Gain (Loss) Recorded in Other Income, Net			Gain (Loss) Recorded in Other Comprehensive Income			Gain (Loss) Recorded in Revenue		Ending Fair Value
Derivatives designated as hedging instruments:
Net investment hedges	$	209	$	—		$	—		$	(22	)^(*)	$	—	$	187
Cash flow hedges		4		(1	)		(1	)		(2	)		1		1
Derivatives not designated as hedging instruments:
Balance sheet hedges		—		(1	)		(1	)		—			—		(2	)

(*)

Foreign currency derivative activity for the three months ended March 31, 2015 was as follows (in millions):


	Beginning Fair Value		Settlement Payment (Receipt)			Gain (Loss) Recorded in Other Income, Net			Gain (Loss) Recorded in Other Comprehensive Income			Gain (Loss) Recorded in Revenue			Ending Fair Value
Derivatives designated as hedging instruments:
Net investment hedges	$	185	$	—		$	—		$	4	^(*)	$	—		$	189
Cash flow hedges		8		(2	)		(1	)		(9	)		(1	)		(5	)
Derivatives not designated as hedging instruments:
Balance sheet hedges		4		(16	)		23			—			—			11

(*)

Foreign Currency Derivative Contracts Balance Sheet Location and Ending Fair Value

Foreign currency derivative contracts balance sheet location and ending fair value was as follows (in millions):


	Balance Sheet Location	December 31, 2014			March 31, 2015
Derivatives designated as hedging instruments:
Net investment hedges	Asset⁽¹⁾	$	190		$	191
	Liability⁽²⁾	$	(5	)	$	(2	)
Cash flow hedges	Asset⁽¹⁾	$	8		$	3
	Liability⁽²⁾	$	—		$	(8	)

Derivatives not designated as hedging instruments:
Balance sheet hedges	Asset⁽¹⁾	$	5		$	11
	Liability⁽²⁾	$	(1	)	$	—

(1)	Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets.

(2)	Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

Convertible Notes (Tables)

3 Months Ended

Mar. 31, 2015

Schedule of Notes

The Notes consist of the following (in thousands):


	December 31, 2014			March 31, 2015
Liability component:
Principal	$	1,437,500		$	1,437,500
Less: note discount		(267,077	)		(251,620	)

Net carrying amount	$	1,170,423		$	1,185,880

Equity component ^(*)	$	305,569		$	305,569

(*)	Recorded on the condensed consolidated balance sheets within additional paid-in capital.

Interest Expense Recognized Related To Notes

The following table sets forth total interest expense recognized related to the Notes (in thousands):


	Three Months Ended March 31, 2014		Three Months Ended March 31, 2015
Accretion of convertible note discount	$	14,666	$	15,457

Fair Value and Carrying Value of Notes


	December 31, 2014				March 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Convertible senior notes	$	1,175,240	$	1,170,423	$	1,217,250	$	1,185,880

Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2015

Lease Commitments

A summary of gross and net lease commitments as of March 31, 2015 was as follows (in millions):


	Gross Operating Lease Commitments		Sublease Income			Net Operating Lease Commitments
Nine months ending December 31, 2015	$	104	$	(13	)	$	91
Years ending December 31,
2016		109		(11	)		98
2017		81		(8	)		73
2018		58		(6	)		52
2019		47		(3	)		44
2020		34		(1	)		33
Due after 5 years		108		(2	)		106

Total gross and net lease commitments	$	541	$	(44	)	$	497

Capital Lease Commitment


	Capital Lease Commitment
Nine months ending December 31, 2015	$	14
Years ending December 31,
2016		15
2017		10
2018		9
2019		5
2020		—
Due after 5 years		—

Gross lease commitment	$	53

Less: interest		(9	)

Net lease commitment included in capital lease and other long-term liabilities	$	44

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References+ Details

Stockholders' Equity And Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2015

Schedule of Stock Based Compensation Activity


	Shares			Weighted Average Exercise Price Per Share
Outstanding at December 31, 2014⁽¹⁾		9,225		$	18.57
Options granted		—		$	—
Options assumed in acquisitions		—		$	—
Options exercised⁽²⁾		(584	)	$	16.41
Options expired		(530	)	$	18.95
Options cancelled/forfeited		(49	)	$	13.50

Outstanding at March 31, 2015⁽¹⁾		8,062		$	18.73

⁽¹⁾	Includes shares subject to performance-based stock options for which performance goals had not been set as of the date shown.

⁽²⁾	The Company generally issues new shares to satisfy stock option exercises.

Schedule of Assumptions used to Calculate Fair Value of Options Granted and Shares Purchased in Employee Stock Purchase Plan

The fair value of option grants is determined using the Black-Scholes option pricing model with the following weighted average assumptions:


	Stock Options			Purchase Plan
	Three Months Ended			Three Months Ended
	March 31, 2014			March 31, 2014
Expected dividend yield		0.0	%		0.0	%
Risk-free interest rate		1.5	%		0.1	%
Expected volatility		36.2	%		38.7	%
Expected life (in years)		4.00			0.24

Schedule of Restricted Stock Units Activity

Restricted stock unit activity under the Plans for the three months ended March 31, 2015 is summarized as follows (in thousands, except per share amounts):


	Shares			Weighted Average Grant Date Fair Value Per Share
Awarded and unvested at December 31, 2014⁽¹⁾		40,677		$	32.38
Granted⁽²⁾		11,634		$	43.83
Assumed in acquisitions		—		$	—
Vested		(5,655	)	$	26.20
Forfeited		(3,508	)	$	30.83

Awarded and unvested at March 31, 2015⁽¹⁾		43,148		$	36.41

⁽¹⁾	Includes the maximum number of shares issuable under the Company’s performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown.

⁽²⁾

Restructuring Charges, Net (Tables)

3 Months Ended

Mar. 31, 2015

Restructuring Charges, Net

Restructuring charges, net was comprised of the following (in thousands):


	Three Months Ended
	March 31, 2014			March 31, 2015
Employee severance pay and related costs	$	3,591		$	44,000
Non-cancelable lease, contract termination, and other charges		6,532			8,617
Reversals of previous charges		(636	)		(3,231	)
Non-cash accelerations of stock-based compensation expense		—			2,705
Other non-cash credits		—			(859	)

Restructuring charges, net	$	9,487		$	51,232

Restructuring Accrual Activity

The Company’s restructuring accrual activity for the three months ended March 31, 2015 is summarized as follows (in thousands):


Accrual balance as of December 31, 2014	$	83,608
Restructuring charges		51,232
Cash paid		(35,287	)
Non-cash accelerations of stock-based compensation expense		(2,705	)
Foreign currency translation and other adjustments		275

Accrual balance as of March 31, 2015	$	97,123

Restructuring Accruals by Segment

Restructuring accruals by segment consisted of the following (in thousands):


	December 31, 2014		March 31, 2015
Americas	$	65,949	$	79,393
EMEA		16,797		14,927
Asia Pacific		862		2,803

Total restructuring accruals	$	83,608	$	97,123

Segments (Tables)

3 Months Ended

Mar. 31, 2015

Segment Information

The following tables present summarized information by segment (in thousands):


	Three Months Ended
	March 31, 2014		March 31, 2015
Revenue by segment:
Americas	$	866,928	$	984,721
EMEA		91,570		81,086
Asia Pacific		174,232		160,163

Total Revenue	$	1,132,730	$	1,225,970

TAC by segment:
Americas	$	34,094	$	166,655
EMEA		9,193		11,704
Asia Pacific		2,622		4,780

Total TAC	$	45,909	$	183,139

Revenue ex-TAC by segment:
Americas	$	832,834	$	818,066
EMEA		82,377		69,382
Asia Pacific		171,610		155,383

Total Revenue ex-TAC		1,086,821		1,042,831

Direct costs by segment⁽¹⁾ :
Americas		59,688		55,730
EMEA		21,669		19,898
Asia Pacific		46,820		50,712
Global operating costs⁽²⁾		652,263		687,382
Gain on sale of patents		—		(2,000	)
Depreciation and amortization		157,534		151,535
Stock-based compensation expense		109,181		115,696
Restructuring charges, net		9,487		51,232

Income (loss) from operations	$	30,179	$	(87,354	)

(1)

(2)

Capital Expenditures by Segment


	Three Months Ended
	March 31, 2014		March 31, 2015
Capital expenditures, net:
Americas	$	63,977	$	122,382
EMEA		15,762		7,653
Asia Pacific		4,916		4,886

Total capital expenditures, net	$	84,655	$	134,921

Property and Equipment Net


	December 31, 2014		March 31, 2015
Property and equipment, net:
Americas:
U.S.	$	1,382,597	$	1,381,676
Other		787		628

Total Americas	$	1,383,384	$	1,382,304

EMEA		34,649		35,408
Asia Pacific		69,651		66,060

Total property and equipment, net	$	1,487,684	$	1,483,772

Enterprise Wide Disclosures Revenues for Groups of Similar Services

The following table presents revenue for groups of similar services (in thousands):


	Three Months Ended
	March 31, 2014		March 31, 2015
Search	$	444,767	$	531,666
Display		453,224		463,733
Other		234,739		230,571

Total revenue	$	1,132,730	$	1,225,970



	Three Months Ended

	March 31, 2014		March 31, 2015
Revenue:
U.S.	$	833,658	$	963,511
International		299,072		262,459

Total revenue	$	1,132,730	$	1,225,970

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References+ Details

Company and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Organization and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - other	$ 285,263	$ 293,603
Selling and and marketing	275,357	302,325
General and administrative	173,513	164,623
Product development	326,747	268,264
Scenario, Adjustment \| Editorial Costs
Organization and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - other		13,000
Scenario, Adjustment \| Facilities Related Costs
Organization and Summary of Significant Accounting Policies [Line Items]
General and administrative		13,000
Scenario, Adjustment \| Sales and marketing
Organization and Summary of Significant Accounting Policies [Line Items]
General and administrative		15,000
Scenario, Previously Reported \| Editorial Costs
Organization and Summary of Significant Accounting Policies [Line Items]
Selling and and marketing		(13,000)
Scenario, Previously Reported \| Facilities Related Costs
Organization and Summary of Significant Accounting Policies [Line Items]
Product development		(13,000)
Scenario, Previously Reported \| Sales and marketing
Organization and Summary of Significant Accounting Policies [Line Items]
Selling and and marketing		$ (15,000)

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References+ Details

Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 8,466,810	$ 10,302,355
Gross Unrealized Gains	29,282,791	37,233,212
Gross Unrealized Losses	(1,599)	(5,445)
Estimated Fair Value, Total available-for-sale marketable securities	37,748,002	47,530,122
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	817,974	850,712
Gross Unrealized Gains	392	82
Gross Unrealized Losses	(156)	(792)
Estimated Fair Value, Total available-for-sale marketable securities	818,210	850,002
Corporate Debt Securities, Commercial Paper, Time Deposits, And Bank Certificates Of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	4,908,876	6,711,683
Gross Unrealized Gains	2,012	612
Gross Unrealized Losses	(1,443)	(4,653)
Estimated Fair Value, Total available-for-sale marketable securities	4,909,445	6,707,642
Corporate Equity Securities \| Alibaba Group
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	2,713,484	2,713,484
Gross Unrealized Gains	29,214,501	37,154,305
Estimated Fair Value, Total available-for-sale marketable securities	31,927,985	39,867,789
Corporate Equity Securities \| Hortonworks, Inc
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	26,246	26,246
Gross Unrealized Gains	65,438	77,783
Estimated Fair Value, Total available-for-sale marketable securities	91,684	104,029
Corporate Equity Securities \| Other corporate equity securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	230	230
Gross Unrealized Gains	448	430
Estimated Fair Value, Total available-for-sale marketable securities	$ 678	$ 660

Available for Sale Securities by Balance Sheet Location (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Short-term marketable securities	$ 4,109,789	$ 5,327,412
Long-term marketable securities	1,618,544	2,230,892
Investment in Alibaba Group	31,927,985	39,867,789
Other long-term assets and investments	91,684	104,029
Total	$ 37,748,002	$ 47,530,122

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References+ Details

Marketable Securities Investments and Fair Value Disclosures - Additional Information (Detail) (USD $)							3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015 Cash and Cash Equivalents	Dec. 31, 2014 Cash and Cash Equivalents	Mar. 31, 2015 Other long-term assets	Dec. 31, 2014 Other long-term assets	Mar. 31, 2015 Convertible Senior Notes	Dec. 31, 2013 Convertible Senior Notes	Mar. 31, 2015 Other income, net Hortonworks, Inc	Mar. 31, 2015 Fair Value Measurements At Reporting Date Using Total Hortonworks, Inc	Dec. 31, 2014 Fair Value Measurements At Reporting Date Using Total Hortonworks, Inc	Mar. 31, 2015 Fair Value Measurements At Reporting Date Using Level 2 Convertible Senior Notes	Dec. 31, 2014 Fair Value Measurements At Reporting Date Using Level 2 Convertible Senior Notes
Highly Liquid Investments [Line Items]
Short-term investments			$ 533,000,000	$ 2,000,000,000
Cash deposited with commercial banks	642,000,000	702,000,000
Warrants										86,153,000	98,062,000
Loss due to decline in fair value of warrants									(12,000,000)
Fair value of the convertible senior notes												1,217,250,000	1,175,240,000
Principal amount								1,437,500,000
Convertible senior notes percent							0.00%	0.00%
Maturity date, convertible senior note							Dec. 01, 2018	Dec. 01, 2018
Other investments held at cost					$ 82,000,000	$ 82,000,000

Available for Sale Securities by Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Due within one year	$ 4,109,789	$ 5,327,412
Due after one year through five years	1,618,544	2,230,892
Total available-for-sale marketable debt securities	$ 5,728,333	$ 7,558,304

Available for Sale Marketable Debt Securities in Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 1,846,211	$ 3,346,236
Less than 12 Months, Unrealized Loss	(1,596)	(5,438)
12 Months or Longer, Fair Value	8,642	3,234
12 Months or Longer, Unrealized Loss	(3)	(7)
Total, Fair Value	1,854,853	3,349,470
Total, Unrealized Loss	(1,599)	(5,445)
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	317,476	744,948
Less than 12 Months, Unrealized Loss	(156)	(792)
Total, Fair Value	317,476	744,948
Total, Unrealized Loss	(156)	(792)
Corporate Debt Securities, Commercial Paper, and Bank Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,528,735	2,601,288
Less than 12 Months, Unrealized Loss	(1,440)	(4,646)
12 Months or Longer, Fair Value	8,642	3,234
12 Months or Longer, Unrealized Loss	(3)	(7)
Total, Fair Value	1,537,377	2,604,522
Total, Unrealized Loss	$ (1,443)	$ (4,653)

Fair Value of Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Fair Value Measurements At Reporting Date Using Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets at fair value

$ 32,486,338

$ 40,346,300

Total financial assets and liabilities at fair value

32,486,338

40,346,300

Fair Value Measurements At Reporting Date Using Level 1 | Money Market Funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Money market funds

465,991

^[1]

373,822

^[1]

Fair Value Measurements At Reporting Date Using Level 1 | Corporate Equity Securities | Other corporate equity securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

678

660

Fair Value Measurements At Reporting Date Using Level 1 | Corporate Equity Securities | Alibaba Group

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

31,927,985

39,867,789

Fair Value Measurements At Reporting Date Using Level 1 | Corporate Equity Securities | Hortonworks, Inc

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

91,684

^[2]

104,029

^[2]

Fair Value Measurements At Reporting Date Using Level 2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets at fair value

5,999,906

9,343,433

Total financial assets and liabilities at fair value

5,990,060

9,337,276

Fair Value Measurements At Reporting Date Using Level 2 | Government and agency securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

818,210

^[1]

850,002

^[1]

Fair Value Measurements At Reporting Date Using Level 2 | Commercial Paper And Bank Certificates Of Deposit

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

1,983,908

^[1]

3,602,321

^[1]

Fair Value Measurements At Reporting Date Using Level 2 | Corporate Debt Securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

2,901,525

^[1]

3,327,017

^[1]

Fair Value Measurements At Reporting Date Using Level 2 | Time Deposits

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

90,857

^[1]

1,361,165

^[1]

Fair Value Measurements At Reporting Date Using Level 2 | Foreign Currency Derivative Contracts

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Foreign currency derivative contracts, assets

205,406

^[3]

202,928

^[3]

Foreign currency derivative contracts, liabilities

(9,846)

^[3]

(6,157)

^[3]

Fair Value Measurements At Reporting Date Using Level 3

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets at fair value

86,153

98,062

Total financial assets and liabilities at fair value

86,153

98,062

Fair Value Measurements At Reporting Date Using Level 3 | Hortonworks, Inc

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Warrants

86,153

98,062

Fair Value Measurements At Reporting Date Using Total

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets at fair value

38,572,397

49,787,795

Total financial assets and liabilities at fair value

38,562,551

49,781,638

Fair Value Measurements At Reporting Date Using Total | Hortonworks, Inc

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Warrants

86,153

98,062

Fair Value Measurements At Reporting Date Using Total | Money Market Funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Money market funds

465,991

^[1]

373,822

^[1]

Fair Value Measurements At Reporting Date Using Total | Government and agency securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

818,210

^[1]

850,002

^[1]

Fair Value Measurements At Reporting Date Using Total | Commercial Paper And Bank Certificates Of Deposit

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

1,983,908

^[1]

3,602,321

^[1]

Fair Value Measurements At Reporting Date Using Total | Corporate Debt Securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

2,901,525

^[1]

3,327,017

^[1]

Fair Value Measurements At Reporting Date Using Total | Time Deposits

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

90,857

^[1]

1,361,165

^[1]

Fair Value Measurements At Reporting Date Using Total | Corporate Equity Securities | Other corporate equity securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

678

660

Fair Value Measurements At Reporting Date Using Total | Corporate Equity Securities | Alibaba Group

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

31,927,985

39,867,789

Fair Value Measurements At Reporting Date Using Total | Corporate Equity Securities | Hortonworks, Inc

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale securities

91,684

^[2]

104,029

^[2]

Fair Value Measurements At Reporting Date Using Total | Foreign Currency Derivative Contracts

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Foreign currency derivative contracts, assets

205,406

^[3]

202,928

^[3]

Foreign currency derivative contracts, liabilities

$ (9,846)

^[3]

$ (6,157)

^[3]

[1]	The money market funds, government and agency securities, commercial paper and bank certificates of deposit, corporate debt securities, and time deposits are classified as part of either cash and cash equivalents or short or long-term marketable securities on the condensed consolidated balance sheets.
[2]	The Hortonworks equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets.
[3]	Foreign currency derivative contracts are classified as part of either other current or noncurrent assets or liabilities on the condensed consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were: $2.1 billion, including contracts designated as net investment hedges of $1.6 billion, as of December 31, 2014; and $2.4 billion, including contracts designated as net investment hedges of $1.9 billion, as of March 31, 2015.

Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains on available-for-sale securities, net of tax	$ 17,373,280	$ 22,086,371
Unrealized gains (losses) on cash flow hedges, net of tax	(9,496)	445
Foreign currency translation, net of tax	(335,796)	(67,188)
Accumulated other comprehensive income	$ 17,027,988	$ 22,019,628

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References+ Details

Noncontrolling Interests (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Beginning noncontrolling interests	$ 43,755	$ 55,688	$ 55,688
Distributions to noncontrolling interests			(22,344)
Net income attributable to noncontrolling interests	975	2,333	10,411
Ending noncontrolling interests	$ 44,730		$ 43,755

Other Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of Other Income (Expense) [Line Items]
Interest, dividend and investment income	$ 8,845	$ 5,437
Interest expense	(17,570)	(17,081)
Loss on Hortonworks warrants	(11,909)
Other expense, net	(10,429)	(1,809)
Total other expense, net	$ (31,063)	$ (13,453)

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References+ Details

Consolidated Financial Statement Details - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Financial Statement Details [Line Items]
Increase in other expense	$ 9
Unrealized foreign exchange currency transaction losses	(36)
Foreign exchange gains from hedging activities	24
Hortonworks, Inc \| Other income, net
Financial Statement Details [Line Items]
Loss due to decline in fair value of warrants	$ (12)

Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 1,225,970	$ 1,132,730
Other income, net	(31,063)	(13,453)
Net income attributable to Yahoo! Inc.	21,198	311,578
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Yahoo! Inc.	1,744	(466)
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	1,660	(454)
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Net Realized Investment Gains (Losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 84	$ (12)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Business combination, cash consideration paid net of cash acquired	$ 23,073,000	$ 21,661,000
Goodwill	5,140,270,000		5,163,654,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, number of entities acquired	1	5
Business combination, total purchase price	23,000,000	23,000,000
Business combination, cash acquired		1,000,000
Business combination, cash consideration paid net of cash acquired		21,661,000
Business combination, amortizable intangible assets	5,000,000	9,000,000
Business combination, cash acquired		1,000,000
Goodwill	20,000,000	13,000,000
Business combination, net assumed liabilities	$ 2,000,000

Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Goodwill [Line Items]

Beginning balance

$ 5,163,654

Acquisitions and other

13,664

Foreign currency translation adjustments

(37,048)

Ending balance

5,140,270

Americas Segment

Goodwill [Line Items]

Beginning balance

4,333,957

^[1]

Acquisitions and other

(7,239)

^[1]

Foreign currency translation adjustments

(1,370)

^[1]

Ending balance

4,325,348

^[1]

Europe Middle East Africa Segment

Goodwill [Line Items]

Beginning balance

531,815

^[2]

Acquisitions and other

20,903

^[2]

Foreign currency translation adjustments

(36,124)

^[2]

Ending balance

516,594

^[2]

Asia Pacific Segment

Goodwill [Line Items]

Beginning balance

297,882

^[3]

Foreign currency translation adjustments

446

^[3]

Ending balance

$ 298,328

^[3]

[1]	Gross goodwill balance for the Americas segment was $4.3 billion as of March 31, 2015.
[2]	Gross goodwill balance for the EMEA segment was $1.1 billion as of March 31, 2015. The EMEA segment includes accumulated impairment losses of $630 million as of March 31, 2015.
[3]	Gross goodwill balance for the Asia Pacific ("APAC") segment was $457 million as of March 31, 2015. The APAC segment includes accumulated impairment losses of $159 million as of March 31, 2015.

Goodwill (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Americas Segment
Goodwill [Line Items]
Gross Goodwill Balance	$ 4,300
Europe Middle East Africa Segment
Goodwill [Line Items]
Gross Goodwill Balance	1,100
Accumulated goodwill impairment	630
Asia Pacific Segment
Goodwill [Line Items]
Gross Goodwill Balance	457
Accumulated goodwill impairment	$ 159

Intangible Assets Net (Detail) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]

Gross Carrying Amount

$ 685,451

Accumulated Amortization

(243,582)

^[1]

Net

441,869

470,842

Customer, Affiliate And Advertiser Related Relationships

Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]

Gross Carrying Amount

375,014

Accumulated Amortization

(105,631)

^[1]

Net

269,383

281,596

Developed Technology And Patents

Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]

Gross Carrying Amount

202,498

Accumulated Amortization

(93,068)

^[1]

Net

109,430

122,674

Trade Names, Trademarks, And Domain Names

Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]

Gross Carrying Amount

107,939

Accumulated Amortization

(44,883)

^[1]

Net

$ 63,056

$ 66,572

[1]	Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, increased total intangible assets by approximately $17 million as of March 31, 2015.

Intangible Assets Net - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 34,478,000	$ 34,349,000
Amortization expense in cost of revenue - other	14,000,000	16,000,000
Estimated amortization expense for the remainder of 2015	98,000,000
Estimated amortization expense 2016	107,000,000
Estimated amortization expense 2017	98,000,000
Estimated amortization expense 2018	80,000,000
Estimated amortization expense 2019	43,000,000
Estimated amortization expense cumulatively thereafter	$ 1,000,000

Basic and Diluted Net Income Attributable to Yahoo Inc. Common Stockholders Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	2	2

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References+ Details

Computation of Basic and Diluted Net Income per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income attributable to Yahoo! Inc.	$ 21,198	$ 311,578
Less: Net income allocated to participating securities		(3)
Net income attributable to Yahoo! Inc. common stockholders - basic	21,198	311,575
Weighted average common shares	934,748	1,009,890
Net income attributable to Yahoo! Inc. common stockholders per share - basic	$ 0.02	$ 0.31
Net income attributable to Yahoo! Inc.	21,198	311,578
Less: Net income allocated to participating securities		(3)
Less: Effect of dilutive securities issued by equity investees	(1,194)	(12,365)
Net income attributable to Yahoo! Inc. common stockholders - diluted	$ 20,004	$ 299,210
Denominator for basic calculation	934,748	1,009,890
Denominator for diluted calculation	947,976	1,031,420
Net income attributable to Yahoo! Inc. common stockholders per share - diluted	$ 0.02	$ 0.29
Restricted Stock Units (RSUs)
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares	10,913	15,670
Stock Options and Employee Stock Purchase Plan
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares	2,315	5,860

Investments in Equity Interests (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 2,346,201	$ 2,489,578
Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	2,339,611	2,482,660
Percent ownership of common stock as of balance sheet date	35.50%	35.50%
Other
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 6,590	$ 6,918
Percent ownership of common stock as of balance sheet date	20.00%	20.00%

Investments in Equity Interests Accounted For Using the Equity Method of Accounting - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified			3 Months Ended				0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015 Yahoo Japan	Mar. 31, 2014 Yahoo Japan	Mar. 31, 2015 Alibaba Group	Mar. 31, 2014 Alibaba Group	Jan. 27, 2015 Alibaba Group SpinCo
Schedule of Equity Method Investments [Line Items]
Fair value of the company's ownership interest in the common stock of Yahoo Japan			$ 8,000,000,000
Cash proceeds from sale of data center assets				11,000,000
Net gain on sale of data center assets				5,000,000
Revenue received through commercial arrangements with Yahoo Japan			60,000,000	68,000,000
Net receivables balance from Yahoo Japan			39,000,000	47,000,000
Deferred revenue	270,886,000	336,963,000			129,000,000
Royalty received					$ 69,000,000	$ 68,000,000
Alibaba Group shares to be held by SpinCo upon completion of Spin-off							384

- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column E

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph Column C

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column C

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.Column C.3,4)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.Column C.7)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column E.2,3)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 5

-Subparagraph (SX 210.12-13.Column C.6)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611282-123010

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph Column C

-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph 3, 4

-Article 12

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph 2, 3

-Article 12

Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph 6

-Article 12

Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 7

-Article 12

+ Details

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References+ Details

Yahoo Japan Condensed Financial Information Operating Data (Detail) (Yahoo Japan, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Revenue	$ 941,241	$ 1,031,656
Gross profit	750,984	843,926
Income from operations	425,053	489,442
Net income	286,793	307,112
Net income attributable to Yahoo Japan	$ 284,846	$ 304,345

- Definition

The amount of gross profit (loss) reported by an equity method investment of the entity.

+ References+ Details

- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References+ Details

Yahoo Japan Condensed Financial Information Balance Sheet Data (Detail) (Yahoo Japan, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Current assets	$ 5,693,613	$ 6,161,126
Long-term assets	1,871,194	1,908,379
Current liabilities	1,725,200	1,948,540
Long-term liabilities	33,647	35,418
Noncontrolling interests	$ 69,634	$ 66,998

- Definition

The amount of current assets reported by an equity method investment of the entity.

+ References+ Details

- Definition

The amount of current liabilities reported by an equity method investment of the entity.

+ References+ Details

- Definition

Amount of equity attributable to noncontrolling interests of an equity method investment of the entity.

+ References+ Details

- Definition

The amount of noncurrent assets reported by an equity method investment of the entity.

+ References+ Details

- Definition

The amount of noncurrent liabilities reported by an equity method investment of the entity.

+ References+ Details

Notional Amounts of Outstanding Forward Contracts (Detail) (Foreign Currency Derivative Contracts, USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative notional amount	$ 2,400	$ 2,100
Net Investment Hedging
Derivative [Line Items]
Derivative notional amount	1,900	1,600
Designated as Hedging Instrument \| Net Investment Hedging
Derivative [Line Items]
Derivative notional amount	1,917	1,647
Designated as Hedging Instrument \| Cash Flow Hedges
Derivative [Line Items]
Derivative notional amount	162	222
Not Designated as Hedging Instrument \| Balance Sheet Hedges
Derivative [Line Items]
Derivative notional amount	$ 281	$ 243

Foreign Currency Forward Contracts Activity (Detail) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Balance Sheet Hedges | Not Designated as Hedging Instrument

Derivative [Line Items]

Beginning Fair Value

$ 4

Settlement Payment (Receipt)

(16)

(1)

Gain (Loss) Recorded in Other Income, Net

(1)

Ending Fair Value

(2)

Cash Flow Hedges | Designated as Hedging Instrument

Derivative [Line Items]

Beginning Fair Value

Settlement Payment (Receipt)

(2)

(1)

Gain (Loss) Recorded in Other Income, Net

(1)

Gain (Loss) Recorded in Other Comprehensive Income

(9)

(2)

Gain (Loss) Recorded in Revenue

(1)

Ending Fair Value

(5)

Net Investment Hedging | Designated as Hedging Instrument

Derivative [Line Items]

Beginning Fair Value

185

209

Gain (Loss) Recorded in Other Comprehensive Income

^[1]

(22)

^[2]

Ending Fair Value

$ 189

$ 187

[1]	This amount does not reflect the tax impact of $1 million recorded during the three months ended March 31, 2015. The $3 million after tax impact of the gain recorded within other comprehensive income was included in accumulated other comprehensive income on the Company's condensed consolidated balance sheets.
[2]	This amount does not reflect the tax impact of $8 million recorded during the three months ended March 31, 2014. The $14 million after tax impact of the loss recorded within other comprehensive income was included in accumulated other comprehensive income on the Company's condensed consolidated balance sheets.

Foreign Currency Forward Contracts Activity (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Net investment hedge CTA, tax	$ (1,591)	$ 8,432
Net investment hedge CTA, net of tax	2,634	(14,049)
Derivatives Designated as Hedging Instruments \| Net Investment Hedging
Derivative [Line Items]
Net investment hedge CTA, tax	(1,000)	8,432
Net investment hedge CTA, net of tax	$ 2,634	$ (14,049)

Foreign Currency Forward Contracts Balance Sheet Location and Ending Fair Value (Detail) (Foreign Currency Derivative Contracts, USD $)
In Millions, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Designated as Hedging Instrument | Net Investment Hedging | Assets

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value asset

$ 191

^[1]

$ 190

^[1]

Designated as Hedging Instrument | Net Investment Hedging | Liabilities

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value liability

(2)

^[2]

(5)

^[2]

Designated as Hedging Instrument | Cash Flow Hedges | Assets

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value asset

^[1]

Designated as Hedging Instrument | Cash Flow Hedges | Liabilities

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value liability

(8)

^[2]

Not Designated as Hedging Instrument | Balance Sheet Hedges | Assets

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value asset

^[1]

Not Designated as Hedging Instrument | Balance Sheet Hedges | Liabilities

Derivatives, Fair Value [Line Items]

Foreign currency forward contract, fair value liability

$ (1)

^[2]

[1]	Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets.
[2]	Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

Credit Agreement - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 750,000,000
Unsecured revolving credit facility, additional commitment	250,000,000
Unsecured revolving credit facility, outstanding	$ 0
After Amendment2
Line of Credit Facility [Line Items]
Unsecured revolving credit facility expiration date	Oct. 08, 2015

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References+ Details

Convertible Notes - Additional Information (Detail) (Convertible Senior Notes, USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes percent	0.00%	0.00%
Net carrying amount	$ 1,185,880,000		$ 1,170,423,000
Conversion rate per $1,000 principal amount of Notes	18.7161
Purchase price of notes as percentage of principal amount, plus accrued and unpaid interest	100.00%
Convertible note, par amount	$ 1,000
Initial conversion price	$ 53.43
Maturity date, convertible senior note	Dec. 01, 2018	Dec. 01, 2018

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References+ Details

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details

Schedule of Notes (Detail) (Convertible Senior Notes, USD $)
In Thousands, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Convertible Senior Notes

Debt Instrument [Line Items]

Principal

$ 1,437,500

Less: note discount

(251,620)

(267,077)

Net carrying amount

1,185,880

1,170,423

Equity component

$ 305,569

^[1]

$ 305,569

^[1]

[1]	Recorded on the condensed consolidated balance sheets within additional paid-in capital.

- Definition

+ References+ Details

Interest Expense Recognized Related To Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule Of Interest Expenses [Line Items]
Accretion of convertible note discount	$ 15,457	$ 14,666
Convertible Senior Notes
Schedule Of Interest Expenses [Line Items]
Accretion of convertible note discount	$ 15,457	$ 14,666

Fair Value and Carrying Value of Notes (Detail) (Convertible Senior Notes, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying Value	$ 1,185,880	$ 1,170,423
Fair Value Measurements At Reporting Date Using Level 2
Debt Instrument [Line Items]
Fair Value	$ 1,217,250	$ 1,175,240

- Definition

+ References+ Details

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended			3 Months Ended								0 Months Ended
	May 15, 2013	Nov. 16, 2011	Mar. 31, 2015 LegalMatter	May 15, 2013	Dec. 07, 2011	Mar. 31, 2015 Maximum	Mar. 31, 2015 Minimum	Mar. 31, 2015 Payable In 2015	Mar. 31, 2015 Payable In 2016	Mar. 31, 2015 Payable In 2017	Mar. 31, 2015 Payable In 2018	Mar. 31, 2015 Payable In 2019	Mar. 31, 2015 Due Thereafter	Nov. 28, 2012 Non-Final Judgment	Nov. 28, 2012 Non-Final Judgment
Commitments and Contingencies Disclosure [Line Items]
Operating and capital lease agreements, original lease period						12 years
Operating and capital lease agreements, expiry year						2025	2015
Affiliate commitments			$ 1,962,000,000					$ 380,000,000	$ 401,000,000	$ 400,000,000	$ 375,000,000	$ 375,000,000	$ 31,000,000
Non-cancelable commitments			202,000,000
Payable in remainder 2015			92,000,000
Payable in 2016			77,000,000
Payable in 2017			20,000,000
Payable in 2018			11,000,000
Payable in 2019			2,000,000
Intellectual property arrangements through 2023			20,000,000
Intellectual property arrangements, expiration year			2023
Number of purported stockholder class action suits filed			2
Alleged total damages		2,750,000,000												2,750,000,000
Counterclaim filed for payments of services rendered				2,600,000	2,600,000										2,600,000
Loss Contingency	$ 172,500

Lease Commitments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Commitments and Contingencies Disclosure [Line Items]
Gross operating lease commitments, Nine months ending December 31, 2015	$ 104
Gross operating lease commitments, years ending December 31, 2016	109
Gross operating lease commitments, 2017	81
Gross operating lease commitments, 2018	58
Gross operating lease commitments, 2019	47
Gross operating lease commitments, 2020	34
Gross operating lease commitments, due after 5 years	108
Total gross operating lease commitments	541
Sublease income, Nine months ending December 31, 2015	(13)
Sublease income, years ending December 31, 2016	(11)
Sublease income, 2017	(8)
Sublease income, 2018	(6)
Sublease income, 2019	(3)
Sublease income, 2020	(1)
Sublease income, due after 5 years	(2)
Total sublease income	(44)
Net operating lease commitments, Nine months ending December 31, 2015	91
Net operating lease commitments, years ending December 31, 2016	98
Net operating lease commitments, 2017	73
Net operating lease commitments, 2018	52
Net operating lease commitments, 2019	44
Net operating lease commitments, 2020	33
Net operating lease commitments, due after 5 years	106
Total net operating lease commitments	$ 497

Capital Lease Commitment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Schedule of Capital Lease Obligations [Line Items]
Nine months ending December 31, 2015	$ 14
Years ending December 31, 2016	15
2017	10
2018	9
2019	5
2020
Due after 5 years
Gross lease commitment	53
Less: interest	(9)
Net lease commitment included in capital lease and other long-term liabilities	$ 44

Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Outstanding stock options, Beginning balance

9,225

^[1]

Stock options granted during the period

Stock options assumed in acquisitions during the period

Stock options exercised during the period

(584)

^[2]

Stock options expired during the period

(530)

Stock options cancelled/forfeited during the period

(49)

Outstanding stock options, Ending balance

8,062

^[1]

Weighted average exercise price of options outstanding, Beginning balance

$ 18.57

^[1]

Weighted-average exercise price of shares granted during period

$ 0

Weighted-average exercise price of shares assumed in acquisitions during period

$ 0

Weighted-average exercise price of shares exercised during period

$ 16.41

^[2]

Weighted-average exercise price of shares expired during period

$ 18.95

Weighted-average exercise price of shares cancelled/forfeited during period

$ 13.50

Weighted average exercise price of options outstanding, Ending balance

$ 18.73

^[1]

[1]	Includes shares subject to performance-based stock options for which performance goals had not been set as of the date shown.
[2]	The Company generally issues new shares to satisfy stock option exercises.

Stockholders' Equity and Employee Benefits - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	May 31, 2012 May 2012 Plan	Mar. 31, 2015 November 2013 Plan	Nov. 30, 2013 November 2013 Plan	Mar. 31, 2015 Stock Repurchase Program	Mar. 31, 2015 March 2015 Plan	Mar. 31, 2015 GAAP Revenue	Mar. 31, 2015 Revenue ex-TAC	Mar. 31, 2015 Ebitda Performance RSUs	Mar. 31, 2015 Stock Options	Mar. 31, 2015 Restricted Stock Awards And Units	Mar. 31, 2015 Restricted Stock Units (RSUs)	Mar. 31, 2014 Restricted Stock Units (RSUs)	Mar. 31, 2015 Performance Based Stock Options First Tranche	Mar. 31, 2015 Performance Based Stock Options GAAP Revenue	Mar. 31, 2015 Performance Based Stock Options Adjusted EBITDA	Mar. 31, 2015 Performance Based Stock Options Revenue ex-TAC	Mar. 31, 2015 Performance Based Restricted Stock Units	Mar. 31, 2015 Performance Based Restricted Stock Units First Tranche	Mar. 31, 2015 Performance Based Restricted Stock Units Second Tranche	Mar. 31, 2015 Performance Based Restricted Stock Units Share-based Compensation Award, Tranche Three [Member]	Mar. 31, 2015 Minimum Performance Based Stock Options	Mar. 31, 2015 Minimum Performance Based Restricted Stock Units	Mar. 31, 2015 Maximum Performance Based Stock Options	Mar. 31, 2015 Maximum Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense											$ 48,000,000	$ 969,000,000
Stock-based compensation, recognition period											1 year 8 months 12 days	2 years 7 months 6 days			12 months				12 months
Vested													5,700,000	8,500,000
Shares withheld to settle employees' minimum statutory obligation for applicable income and other employment taxes													2,200,000	3,300,000
Payments made to taxing authorities for employees' tax obligations	97,426,000	125,403,000
Stock awards vesting percentage for each performance period																							0.00%	0.00%	100.00%	200.00%
Financial performance metrics for stock option awards																33.3333%	33.3333%	33.3333%
Stock options grant date fair value															31,000,000
Financial performance metrics for restricted stock units awards								33.3333%	33.3333%	33.3333%
Restricted stock units grant date fair value																				9,000,000	11,000,000	19,000,000
Treasury stock acquired repurchase authorization value			5,000,000,000		5,000,000,000		2,000,000,000
Stock repurchase program expiration date				2016-12			2018-03
Remaining authorized purchase capacity				726,000,000			2,000,000,000
Repurchases of common stock, shares						4,000,000
Average purchase price per share of common stock repurchased during the period						$ 47.65
Repurchases of common stock, value						$ 204,000,000

Weighted Average Assumptions Used to Calculate Fair Value of Options Granted (Detail)	3 Months Ended
	Mar. 31, 2014
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%
Risk-free interest rate	1.50%
Expected volatility	36.20%
Expected life (in years)	4 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%
Risk-free interest rate	0.10%
Expected volatility	38.70%
Expected life (in years)	2 months 27 days

Restricted Stock Units Activity (Detail) (Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awarded and unvested, Beginning balance

40,677

^[1]

Granted

11,634

^[2]

Assumed in acquisitions

Vested

(5,655)

Forfeited

(3,508)

Awarded and unvested, Ending balance

43,148

^[1]

Weighted-average grant date fair value per share, Beginning balance

$ 32.38

^[1]

Weighted-average grant date fair value per share, granted shares

$ 43.83

^[2]

Weighted-average grant date fair value per share, assumed in acquisitions

$ 0

Weighted-average grant date fair value per share, vested shares

$ 26.20

Weighted-average grant date fair value per share, forfeited shares

$ 30.83

Weighted-average grant date fair value per share, Ending balance

$ 36.41

^[1]

[1]

Includes the maximum number of shares issuable under the Company's performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown.

[2]

Restructuring Charges (Reversals), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Employee severance pay and related costs	$ 44,000	$ 3,591
Non-cancelable lease, contract termination, and other charges	8,617	6,532
Reversals of previous charges	(3,231)	(636)
Non-cash accelerations of stock-based compensation expense	2,705
Other non-cash credits	(859)
Restructuring charges, net	$ 51,232	$ 9,487

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References+ Details

Restructuring Charges (Reversals), Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 51,232	$ 9,487
Restructuring liability	97,123		83,608
Americas Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	41,000	5,000
Restructuring liability	79,393		65,949
Europe Middle East Africa Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	7,000	4,000
Restructuring liability	14,927		16,797
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	3,000
Restructuring liability	2,803		862
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liability	34,000
Non-Cancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 63,000

Restructuring Accrual Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 83,608
Restructuring charges	51,232	9,487
Cash paid	(35,287)
Non-cash accelerations of stock-based compensation expense	(2,705)
Foreign currency translation and other adjustments	275
Ending balance	$ 97,123

Restructuring Accruals by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 97,123	$ 83,608
Americas Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	79,393	65,949
Europe Middle East Africa Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	14,927	16,797
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 2,803	$ 862

Income Taxes - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014 Alibaba Group	Dec. 31, 2012 Alibaba Group
Income Taxes [Line Items]
Effective tax rate	35.00%	25.00%
Undistributed earnings of foreign subsidiaries	$ 3,000,000,000
Unrecognized tax benefits	1,019,000,000
Unrecognized tax benefits recorded on condensed consolidated balance sheets	966,000,000
Increase (decrease) in gross unrecognized tax benefit	(4,000,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	(154,000,000)
Number of ADSs sold at initial public offering			140
Sale of investments in equity interests, shares				523
Indirect tax assessed, not accrued	$ 105,000,000

Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Segment Reporting Information [Line Items]

Revenue

$ 1,225,970

$ 1,132,730

TAC

183,139

45,909

Revenue ex-TAC

1,042,831

1,086,821

Global operating costs

687,382

^[1]

652,263

^[1]

Gain on sale of patents

(2,000)

Depreciation and amortization

151,535

157,534

Stock-based compensation expense

115,696

109,181

Restructuring charges, net

51,232

9,487

Income (loss) from operations

(87,354)

30,179

Americas Segment

Segment Reporting Information [Line Items]

Revenue

984,721

866,928

TAC

166,655

34,094

Revenue ex-TAC

818,066

832,834

Direct costs by segment

55,730

^[2]

59,688

^[2]

Restructuring charges, net

41,000

5,000

Europe Middle East Africa Segment

Segment Reporting Information [Line Items]

Revenue

81,086

91,570

TAC

11,704

9,193

Revenue ex-TAC

69,382

82,377

Direct costs by segment

19,898

^[2]

21,669

^[2]

Restructuring charges, net

7,000

4,000

Asia Pacific Segment

Segment Reporting Information [Line Items]

Revenue

160,163

174,232

TAC

4,780

2,622

Revenue ex-TAC

155,383

171,610

Direct costs by segment

50,712

^[2]

46,820

^[2]

Restructuring charges, net

$ 3,000

[1]

[2]

Capital Expenditures by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 134,921	$ 84,655
Americas Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	122,382	63,977
Europe Middle East Africa Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	7,653	15,762
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 4,886	$ 4,916

Property and Equipment Net by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 1,483,772	$ 1,487,684
Americas Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	1,382,304	1,383,384
Americas Segment \| United States
Segment Reporting Information [Line Items]
Total property and equipment, net	1,381,676	1,382,597
Americas Segment \| Other Americas
Segment Reporting Information [Line Items]
Total property and equipment, net	628	787
Europe Middle East Africa Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	35,408	34,649
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 66,060	$ 69,651

Revenues for Groups of Similar Services (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue from External Customer [Line Items]
Total revenue	$ 1,225,970	$ 1,132,730
Search
Revenue from External Customer [Line Items]
Total revenue	531,666	444,767
Display
Revenue from External Customer [Line Items]
Total revenue	463,733	453,224
Other
Revenue from External Customer [Line Items]
Total revenue	230,571	234,739
United States
Revenue from External Customer [Line Items]
Total revenue	963,511	833,658
International
Revenue from External Customer [Line Items]
Total revenue	$ 262,459	$ 299,072

Search Agreement with Microsoft Corporation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended		12 Months Ended	3 Months Ended	0 Months Ended
	Feb. 23, 2015	Dec. 09, 2010	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2015 Taiwan and Hong Kong	Apr. 15, 2015 Subsequent Event
Search Agreement With Microsoft Corporation [Line Items]
Percentage of search queries originating from personal computers accessing Yahoo Properties and its Affiliate sites that a payment request can be made							51.00%
Revenue share rate from Microsoft's services under the Search Agreement, to be received in first five years			88.00%
Revenue share rate from Microsoft's services under the Search Agreement effective February 23, 2015	90.00%
Revenue share rate from Microsoft's services under the Eleventh agreement							93.00%
Microsoft revenue share rate before deduction of affiliate site's share of revenue							7.00%
Term of search agreement with Microsoft, years			10 years
Revenue attributable to Search Agreement			39.00%	36.00%
Term of guarantee Yahoo's revenue per search						18 months
Revenue collected from Search Agreement			$ 8		$ 52
Uncollected Search Agreement revenue			$ 296		$ 330
Term of license of core search technology with Microsoft, years		10 years

Fair Value of Financial Assets and Liabilities (Parenthetical) (Detail) (Foreign Currency Derivative Contracts, USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contract, notional amount	$ 2,400	$ 2,100
Net Investment Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contract, notional amount	$ 1,900	$ 1,600