Altaba (AABA) 10-K 29 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 12, 2016	Jun. 30, 2015
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	YHOO
Entity Registrant Name	YAHOO INC
Entity Central Index Key	1,011,006
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		946,811,547
Entity Public Float			$ 34,070,929,391

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents		$ 1,631,911	$ 2,664,098
Short-term marketable securities		4,225,112	5,327,412
Accounts receivable, net of allowance of $39,799 and $57,503 as of December 31, 2014 and 2015, respectively		1,047,504	1,032,704
Prepaid expenses and other current assets (includes restricted cash of $23,088 and $29,678 as of December 31, 2014 and 2015, respectively)		602,792	420,207
Total current assets		7,507,319	9,444,421
Long-term marketable securities		975,961	2,230,892
Property and equipment, net		1,547,323	1,487,684
Goodwill		808,114	5,152,570
Intangible assets, net		347,269	470,842
Other long-term assets and investments (includes restricted cash of $3,818 and $0 as of December 31, 2014 and 2015, respectively)		342,390	563,560
Investment in Alibaba Group		31,172,361	39,867,789
Investments in equity interests		2,503,229	2,489,578
Total assets		45,203,966	61,707,336
Current liabilities:
Accounts payable		208,691	238,018
Income taxes payable related to sale of Alibaba Group ADSs			3,282,293
Other accrued expenses and current liabilities		934,658	657,709
Deferred revenue		134,031	336,963
Total current liabilities		1,277,380	4,514,983
Convertible notes		1,233,485	1,170,423
Long-term deferred revenue		27,801	20,774
Other long-term liabilities		118,689	143,095
Deferred tax liabilities related to investment in Alibaba Group	[1]	12,611,867	16,154,906
Deferred and other long-term tax liabilities		855,324	917,563
Total liabilities		$ 16,124,546	$ 22,921,744
Commitments and contingencies (Note 12)
Yahoo! Inc. stockholders' equity:
Preferred stock, $0.001 par value; 10,000 shares authorized; none issued or outstanding
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 962,959 shares issued and 945,854 shares outstanding as of December 31, 2015		$ 959	$ 945
Additional paid-in capital		8,807,273	8,499,475
Treasury stock at cost, 12,933 shares as of December 31, 2014 and 17,105 shares as of December 31, 2015		(911,533)	(712,455)
Retained earnings		4,570,807	8,934,244
Accumulated other comprehensive income		16,576,031	22,019,628
Total Yahoo! Inc. stockholders' equity		29,043,537	38,741,837
Noncontrolling interests		35,883	43,755
Total equity		29,079,420	38,785,592
Total liabilities and equity		$ 45,203,966	$ 61,707,336
[1]	Deferred and other income tax liabilities are presented on a net basis by jurisdiction. The balances as of December 31, 2014 and December 31, 2015 include the deferred tax liabilities related to investment in Alibaba Group.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance		$ 57,503	$ 39,799
Restricted cash	[1]	29,678	23,088
Restricted cash		$ 0	$ 3,818	[2]
Preferred stock, par value		$ 0.001	$ 0.001
Preferred stock, shares authorized		10,000	10,000
Preferred stock, issued		0	0
Preferred stock, outstanding		0	0
Common stock, par value		$ 0.001	$ 0.001
Common stock, shares authorized		5,000,000	5,000,000
Common stock, shares issued		962,959	949,771
Common stock, shares outstanding		945,854	936,838
Treasury stock at cost, shares		17,105	12,933
[1]	The amount represents customer funds received by the Company in connection with its online e-commerce services in the Asia Pacific region that are restricted in a separate bank account.
[2]	The amount represents letters of credit secured with cash.

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue	$ 4,968,301	$ 4,618,133	$ 4,680,380
Operating expenses:
Cost of revenue-traffic acquisition costs	877,514	217,531	254,442
Cost of revenue-other	1,200,234	1,169,844	1,094,938
Sales and marketing	1,080,718	1,084,438	1,083,872
Product development	1,177,923	1,156,386	957,587
General and administrative	687,804	686,272	667,403
Amortization of intangibles	79,042	66,750	44,841
Gain on sales of patents	(11,100)	(97,894)	(79,950)
Asset impairment charge	44,381
Goodwill impairment charge	4,460,837	88,414	63,555
Intangibles impairment charge	15,423
Restructuring charges, net	104,019	103,450	3,766
Total operating expenses	9,716,795	4,475,191	4,090,454
Income (loss) from operations	(4,748,494)	142,942	589,926
Other income (expense), net	(75,782)	10,369,439	43,357
Income (loss) before income taxes and earnings in equity interests	(4,824,276)	10,512,381	633,283
(Provision) benefit for income taxes	89,598	(4,038,102)	(153,392)
Earnings in equity interests, net of tax	383,571	1,057,863	896,675
Net income (loss)	(4,351,107)	7,532,142	1,376,566
Net income attributable to noncontrolling interests	(7,975)	(10,411)	(10,285)
Net income (loss) attributable to Yahoo! Inc.	$ (4,359,082)	$ 7,521,731	$ 1,366,281
Net income (loss) attributable to Yahoo! Inc. common stockholders per share-basic	$ (4.64)	$ 7.61	$ 1.30
Net income (loss) attributable to Yahoo! Inc. common stockholders per share-diluted	$ (4.64)	$ 7.45	$ 1.26
Shares used in per share calculation-basic	939,141	987,819	1,052,705
Shares used in per share calculation-diluted	939,141	1,004,108	1,070,811
Stock-based compensation expense by function:
Stock-based compensation expense by function	$ 457,153	$ 420,174	$ 278,220
Cost of revenue - other
Stock-based compensation expense by function:
Stock-based compensation expense by function	32,010	42,155	15,545
Sales and marketing
Stock-based compensation expense by function:
Stock-based compensation expense by function	141,418	145,777	101,852
Product development
Stock-based compensation expense by function:
Stock-based compensation expense by function	190,454	139,056	83,396
General and administrative
Stock-based compensation expense by function:
Stock-based compensation expense by function	93,271	$ 93,186	$ 77,427
Restructuring charges, net
Stock-based compensation expense by function:
Stock-based compensation expense by function	$ 2,705

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income (loss)	$ (4,351,107)	$ 7,532,142	$ 1,376,566
Available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities, net of taxes of $(1,724), $(15,170,607) and $3,551,551 for 2013, 2014 and 2015, respectively	(5,166,595)	22,072,073	6,776
Reclassification adjustment for realized (gains) losses on available-for-sale securities included in net income, net of taxes of $479, $1,339 and $(104) for 2013, 2014 and 2015, respectively	174	(2,218)	(796)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	(5,166,421)	22,069,855	5,980
Foreign currency translation adjustments ("CTA"):
Foreign CTA gains (losses), net of taxes of $(19,754), $1,734 and $1,279 for 2013, 2014 and 2015, respectively	(279,135)	(363,013)	(577,711)
Net investment hedge CTA gains (losses), net of taxes of $(192,369), $(79,037) and $(1,941) for 2013, 2014 and 2015, respectively	3,333	130,904	317,459
Reclassification adjustment for realized (gains) losses included in CTA, net of taxes of $0, $30,325 and $0 for 2013, 2014, and 2015, respectively		(50,301)
Net foreign CTA gains (losses), net of tax	(275,802)	(282,410)	(260,252)
Cash flow hedges:
Unrealized gains (losses) on cash flow hedges, net of taxes of $(1,199), $(3,044) and $(490) for 2013, 2014 and 2015, respectively	(5,795)	5,704	3,492
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income, net of taxes of $575, $2,771 and $1,319 for 2013, 2014 and 2015, respectively	4,421	(5,259)	(2,080)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	(1,374)	445	1,412
Other comprehensive income (loss)	(5,443,597)	21,787,890	(252,860)
Comprehensive income (loss)	(9,794,704)	29,320,032	1,123,706
Less: comprehensive income attributable to noncontrolling interests	(7,975)	(10,411)	(10,285)
Comprehensive income (loss) attributable to Yahoo! Inc.	$ (9,802,679)	$ 29,309,621	$ 1,113,421

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrealized gains (losses) on available-for-sale securities, taxes	$ 3,551,551	$ (15,170,607)	$ (1,724)
Reclassification adjustment for realized (gains) losses on available-for-sale securities included in net income, taxes	(104)	1,339	479
Foreign CTA gains (losses), taxes	1,279	1,734	(19,754)
Net investment hedge CTA gains (losses), taxes	(1,941)	(79,037)	(192,369)
Reclassification adjustment for realized (gains) losses included in CTA, taxes	0	30,325	0
Unrealized gains (losses) on cash flow hedges, taxes	(490)	(3,044)	(1,199)
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income, taxes	$ 1,319	$ 2,771	$ 575

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Common stockAccelerated Share Repurchases	Additional Paid-in Capital	Treasury stock	Treasury stockAccelerated Share Repurchases	Retained earnings	Accumulated other comprehensive income
Balance, beginning of year at Dec. 31, 2012		$ 1,187		$ 9,563,348	$ (1,368,043)		$ 5,792,459	$ 571,249
Common stock and stock-based awards issued				353,241
Repurchases of common stock					(3,344,396)
Net income (loss) attributable to Yahoo! Inc.	$ 1,366,281						1,366,281
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	5,980							5,980
Common stock issued		26
Stock-based compensation expense				294,408
Net change in unrealized gains (losses) on cash flow hedges, net of tax	1,412							1,412
Common stock retired		(198)
Tax (detriments) benefits from stock-based awards				49,061
Foreign currency translation adjustments, net of tax	(260,252)							(260,252)
Tax withholdings related to net share settlements of restricted stock awards				(139,815)
Retirement of treasury stock				(1,620,704)	4,512,211		(2,891,311)
Equity component of convertible senior notes, net				268,084
Purchase of note hedges				(205,706)
Issuance of warrants				124,775
Other				1,612
Balance, end of year at Dec. 31, 2013	13,074,909	$ 1,015		8,688,304	(200,228)		4,267,429	318,389
Balance, beginning of year at Dec. 31, 2012		1,115,233
Common stock and restricted stock issued		26,401
Restricted stock issued under compensation arrangements related to acquisitions		1,567
Repurchases of common stock		(128,863)
Balance, end of year at Dec. 31, 2013		1,014,338
Common stock and stock-based awards issued				306,608
Repurchases of common stock					(2,430,436)	$ (1,732,794)
Net income (loss) attributable to Yahoo! Inc.	7,521,731						7,521,731
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	22,069,855							22,069,855
Common stock issued		$ 24
Stock-based compensation expense				432,614
Treasury shares reissuance					4,189		(2,792)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	445							445
Common stock retired		(94)
Tax (detriments) benefits from stock-based awards				145,711
Foreign currency translation adjustments, net of tax	(282,410)							(369,061)
Tax withholdings related to net share settlements of restricted stock awards				(280,879)
Retirement of treasury stock				(794,596)	3,646,814		(2,852,124)
Other				1,713
Balance, end of year at Dec. 31, 2014	38,741,837	$ 945		8,499,475	(712,455)		8,934,244	22,019,628
Common stock and restricted stock issued		24,197
Repurchases of common stock		(61,838)	(39,859)
Balance, end of year at Dec. 31, 2014		936,838
Common stock and stock-based awards issued				58,778
Repurchases of common stock					(203,771)
Net income (loss) attributable to Yahoo! Inc.	(4,359,082)						(4,359,082)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	(5,166,421)							(5,166,421)
Common stock issued		$ 14
Stock-based compensation expense				464,586
Treasury shares reissuance					4,693		(4,355)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	(1,374)							(1,374)
Tax (detriments) benefits from stock-based awards				41,729
Foreign currency translation adjustments, net of tax	(275,802)							(275,802)
Tax withholdings related to net share settlements of restricted stock awards				(257,731)
Other				436
Balance, end of year at Dec. 31, 2015	$ 29,043,537	$ 959		$ 8,807,273	$ (911,533)		$ 4,570,807	$ 16,576,031
Common stock and restricted stock issued		12,824
Restricted stock issued under compensation arrangements related to acquisitions		468
Repurchases of common stock		(4,276)
Balance, end of year at Dec. 31, 2015		945,854

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (4,351,107)	$ 7,532,142	$ 1,376,566
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	472,894	475,031	532,485
Amortization of intangible assets	136,719	131,537	96,518
Accretion of convertible notes discount	63,061	59,838	4,846
Stock-based compensation expense	459,858	420,174	278,220
Non-cash asset impairment charge	44,381
Non-cash goodwill impairment charge	4,460,837	88,414	63,555
Non-cash intangibles impairment charge	15,423
Non-cash restructuring charges (reversals)	3,150	(3,394)	547
Non-cash accretion on marketable securities	47,218	30,878	36,985
Foreign exchange (gain) loss	4,376	15,978	(10,852)
Gain on sale of assets and other	(2,878)	(11,383)	(3,736)
Gain on sale of Alibaba Group ADSs		(10,319,437)
Gain on sales of patents	(11,100)	(97,894)	(79,950)
(Gain) loss on Hortonworks warrants	19,199	(98,062)
Earnings in equity interests	(383,571)	(1,057,863)	(896,675)
Dividend income related to Alibaba Group Preference Shares			(35,726)
Tax benefits from stock-based awards	41,729	145,711	49,061
Excess tax benefits from stock-based awards	(58,282)	(149,582)	(64,407)
Deferred income taxes	(42,341)	465,873	(84,302)
Dividends received from equity investees	142,045	83,685	135,058
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(39,065)	29,278	26,199
Prepaid expenses and other	21,842	(82,419)	27,401
Accounts payable	(59,965)	14,165	(7,764)
Accrued expenses and other liabilities	109,776	156,307	(98,853)
Incomes taxes payable related to sale of Alibaba Group ADSs	(3,282,293)	3,282,293
Deferred revenue	(195,328)	(194,920)	(149,929)
Net cash provided by (used in) operating activities	(2,383,422)	916,350	1,195,247
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(554,163)	(413,019)	(342,971)
Proceeds from sales of property and equipment	11,176	17,404	4,840
Purchases of marketable securities	(5,206,245)	(7,890,092)	(3,223,190)
Proceeds from sales of marketable securities	822,997	2,269,659	2,871,834
Proceeds from maturities of marketable securities	6,691,645	945,696	748,915
Proceeds from sale of Alibaba Group ADSs, net of underwriting discounts, commissions, and fees		9,404,974
Proceeds related to the redemption of Alibaba Group Preference Shares			800,000
Acquisitions, net of cash acquired	(175,693)	(859,036)	(1,247,544)
Proceeds from sales of patents	29,100	86,300	79,950
Purchases of intangible assets	(4,811)	(2,658)	(2,500)
Proceeds from settlement of derivative hedge contracts	147,179	254,496	312,266
Payments for settlement of derivative hedge contracts	(8,817)	(5,454)	(22,708)
Payments for equity investments in privately held companies		(74,399)	(4,226)
Other investing activities, net	(256)	4,630	2,113
Net cash (used in) provided by investing activities	1,752,112	3,738,501	(23,221)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	59,130	308,029	353,267
Repurchases of common stock	(203,771)	(4,163,227)	(3,344,396)
Proceeds from issuance of convertible notes			1,412,344
Payments for note hedges			(205,706)
Proceeds from issuance of warrants			124,775
Excess tax benefits from stock-based awards	58,282	149,582	64,407
Tax withholdings related to net share settlements of restricted stock units	(257,731)	(280,879)	(139,815)
Distributions to noncontrolling interests	(15,847)	(22,344)
Proceeds from credit facility borrowings			150,000
Repayment of credit facility borrowings			(150,000)
Other financing activities, net	(17,321)	(13,627)	(8,760)
Net cash used in financing activities	(377,258)	(4,022,466)	(1,743,884)
Effect of exchange rate changes on cash and cash equivalents	(23,619)	(45,877)	(18,330)
Net change in cash and cash equivalents	(1,032,187)	586,508	(590,188)
Cash and cash equivalents at beginning of period	2,664,098	2,077,590	2,667,778
Cash and cash equivalents at end of period	1,631,911	2,664,098	2,077,590
NON-CASH ACTIVITIES:
Change in non-cash acquisitions of property and equipment	$ (12,392)	$ (27,533)	$ 37,318

The Company And Summary Of Sign

The Company And Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
The Company And Summary Of Significant Accounting Policies	Note 1 The Company And Summary Of Significant Accounting Policies The Company. Basis of Presentation. At the beginning of 2015, the Company began classifying 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 nil and $89 million, respectively, in internal website editorial costs previously included in sales and marketing expense to cost of revenue—other for the years ended December 31, 2013 and 2014. Also, at the beginning of 2015, the Company began classifying non-data center facilities-related costs within general and administrative expense. To conform to the current period presentation, the Company reclassified $51 million and $51 million, respectively, in facilities-related costs previously included in product development expense and $47 million and $61 million, respectively, previously included in sales and marketing expense to general and administrative expense for the years ended December 31, 2013 and 2014. Prior to the adoption of Accounting Standard Update (“ASU”) 2015-16, “Business Combinations,” in the third quarter of 2015, the Company identified measurement-period adjustments of $11 million to previous purchase accounting estimates for acquisitions, which were primarily related to the finalization of tax and other adjustments. These adjustments were immaterial and applied retrospectively to the acquisition dates. Accordingly, the Company’s consolidated balance sheet as of December 31, 2014 has been updated to reflect the effects of the measurement-period adjustments. The Company revised the 2014 Consolidated Statement of Cash Flows to correct for a non-cash acquisition of property and equipment resulting in an increase in cash provided by operating activities of $23 million and a corresponding decrease in net cash provided by investing activities. 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, originally developed content, acquired content, 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. Concentration of Risk. The fair value of the equity investments in Alibaba Group and Hortonworks will vary over time and is subject to a variety of market risks including: company performance, macro-economic, regulatory, industry, 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 the Company’s investments in marketable securities, including Alibaba Group and Hortonworks changes. Accounts receivable are typically unsecured and are derived from revenue earned from customers. The Company performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. Historically, such losses have been within management’s expectations. The Company’s derivative instruments, including the convertible note hedge transactions, expose the Company to credit risk to the extent that its derivative counterparties become unable to meet their financial obligations under the terms of the agreements. The Company seeks to mitigate this risk by limiting its derivative counterparties to major financial institutions and by spreading the risk across several major financial institutions. In addition, the potential risk of loss with any one counterparty resulting from this type of credit risk is monitored on an ongoing basis. See “Note 9—Foreign Currency Derivative Financial Instruments” for additional information related to the Company’s derivative instruments. The Company also holds warrants in Hortonworks, which expose the Company to variability in fair value based on changes in the stock price as an input to the Black-Scholes model. Revenue under the Company’s Search and Advertising Sales Agreement (as amended, the “Search Agreement”) with Microsoft Corporation (“Microsoft”) represented approximately 31 percent, 35 percent, and 35 percent of the Company’s revenue for the years ended December 31, 2013, 2014 and, 2015, respectively, and no other individual customer accounted for 10 percent or more of the Company’s revenue for 2013, 2014, or 2015. As of December 31, 2014 and 2015, no one customer accounted for 10 percent or more of the accounts receivable balance. Comprehensive Income (loss). Foreign Currency. Cash and Cash Equivalents, Short- and Long-Term Marketable Securities. Operating cash deposits held with banks may exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risk by spreading such risk across multiple counterparties and monitoring the risk profiles of these counterparties. The Company’s marketable equity securities, including Alibaba Group and Hortonworks, are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income. The change in the classification of the Company’s investments in Alibaba Group and Hortonworks to available-for-sale marketable securities exposes the Company’s investment portfolio to increased equity price risk. The Company evaluates the marketable equity securities periodically for possible other-than-temporary impairment. A decline of fair value below cost basis is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire cost basis. In those instances, an impairment charge equal to the difference between the fair value and the cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell the marketable equity securities, an impairment is considered other-than-temporary if the Company does not expect to recover the entire cost basis; in those instances, a loss equal to the difference between fair value and the cost basis of the marketable equity security is recognized in earnings. Realized gains or losses and declines in value judged to be other-than-temporary, if any, on available-for-sale securities are reported in other income, net. The Company evaluates its marketable debt investments periodically for possible other-than-temporary impairment. A decline of fair value below amortized costs of debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. In those instances, an impairment charge equal to the difference between the fair value and the amortized cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell a debt security, an impairment is considered other-than-temporary if the Company does not expect to recover the entire amortized cost basis; in those instances, a credit loss equal to the difference between the present value of the cash flows expected to be collected based on credit risk and the amortized cost basis of the debt security is recognized in earnings. The Company has no current requirement or intent to sell a material portion of debt securities as of December 31, 2015. The Company expects to recover up to (or beyond) the initial cost of investment for securities held. In computing realized gains and losses on available-for-sale securities, the Company determines cost based on amounts paid, including direct costs such as commissions to acquire the security, using the specific identification method. During the years ended December 31, 2013, 2014 and 2015, gross realized gains and losses on available-for-sale marketable debt and equity securities were not material. Allowance for Doubtful Accounts. Foreign Currency Derivative Financial Instruments. For derivatives designated as cash flow hedges, the effective portion of the unrealized gains or losses on these forward contracts is recorded in accumulated other comprehensive income on the Company’s consolidated balance sheets and reclassified into revenue in the consolidated statements of operations when the underlying hedged revenue is recognized. If the cash flow hedges were to become ineffective, the ineffective portion would be immediately recorded in other income (expense), net in the Company’s consolidated statements of operations. 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 balance sheet hedges are used to partially offset the foreign currency exchange gains and losses generated by the re-measurement of certain assets and liabilities denominated in non-functional currency. Changes in the fair value of these derivatives are recorded in other income (expense), net on the Company’s consolidated statements of operations. The fair values of the balance sheet hedges are determined using quoted observable inputs. The Company recognizes all derivative instruments as other assets or liabilities on the Company’s consolidated balance sheets at fair value. See Note 9—“Foreign Currency Derivative Financial Instruments” for a full description of the Company’s derivative financial instrument activities and related accounting. Property and Equipment. Property and equipment to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. Determination of recoverability is based on the lowest level of identifiable estimated undiscounted future cash flows resulting from the use of the asset and its eventual disposition. Measurement of any impairment loss for long-lived assets that management expects to hold and use is based on the excess of the carrying value of the asset over its fair value. No impairments of such assets were identified during any of the periods presented. Capitalized Software and Labor. Goodwill. Intangible Assets. Originally Developed Content and Acquired Content. For originally developed content, the Company performs regular recoverability assessments on a program-by-program basis. If there are any events or changes in circumstances indicating that the Company should assess whether the fair value of originally developed content is less than its unamortized costs, the Company performs a fair value analysis using an expected cash flow approach. The amount by which the unamortized costs of the originally developed content exceed estimated fair value is charged to expense as an asset impairment. During the year ended December 31, 2015, the Company recorded an asset impairment charge of $16 million related to originally developed content. For acquired content, the Company compares the net realizable value on a program-by-program basis with the unamortized cost. The amount by which the unamortized costs of the acquired content exceed net realizable value is charged to expense as an asset impairment. During the year ended December 31, 2015, the Company recorded an asset impairment charge of $28 million related to acquired content, primarily driven by a reduction of forecasted revenues to be generated from advertising on Yahoo Properties. Investments in Equity Interests. The Company reviews its investments for other-than-temporary impairment whenever events or changes in business circumstances indicate that the carrying value of the investment may not be fully recoverable. Investments identified as having an indication of impairment are subject to further analysis to determine if the impairment is other-than-temporary and this analysis requires estimating the fair value of the investment. The determination of fair value of the investment involves considering factors such as the stock prices of public companies in which the Company has an equity investment, current economic and market conditions, the operating performance of the companies including current earnings trends and forecasted cash flows, and other company and industry specific information. Leasing. The Company establishes assets and liabilities for the estimated construction costs incurred under build-to-suit lease arrangements to the extent the Company is involved in the construction of structural improvements or take construction risk prior to commencement of a lease. Upon the right to control the facilities under build-to-suit leases, the Company assesses whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance. If the Company continues to be the deemed owner, the facilities are accounted for as finance leases. Income Taxes. Significant judgment is required in evaluating the Company’s uncertain tax positions and determining its provision for income taxes. The Company establishes liabilities for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. These liabilities are established when the Company believes that certain positions might be challenged despite its belief that its tax return positions are in accordance with applicable tax laws. The Company adjusts these liabilities when new information becomes available, such as the closing of a tax audit, new tax legislation, developments in case law or interactions with the tax authorities. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the effect of changes to liabilities for tax-related uncertainties that are considered appropriate, as well as the related net interest and penalties. Income taxes paid, net of refunds received, were $208 million, $90 million, and $3 billion in the years ended December 31, 2013, 2014, and 2015, respectively. Interest paid was not material in any of the years presented. See Note 16—“Income Taxes” for additional information. Revenue Recognition. 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 to the Search Agreement, the Revenue Share Rate increased to 93 percent, but Microsoft now receives its 7 percent revenue share before deduction of the Affiliate site’s share of revenue. The Affiliate site’s share of revenue is deducted from the Company’s 93 percent Revenue Share Rate. As the Company is not the primary obligor in the arrangement with the advertisers and publishers, the amounts paid to Affiliates are recorded as a reduction of revenue. See Note 19—“Search Agreement with Microsoft Corporation” for a description of the Search Agreement with Microsoft. The Company recognizes search revenue generated from mobile ads served through Yahoo Gemini to Yahoo Properties and Affiliate sites. The search revenue generated from mobile ads served through Yahoo Gemini that involve traffic supplied by Affiliates is reported gross of the TAC paid to Affiliates (reported as cost of revenue—TAC) as the Company performs the search service for advertisers. Accordingly, the Company is considered the primary obligor to the advertisers who are the customers of the search advertising service. In October 2015, Yahoo reached an agreement with Google that provides Yahoo with additional flexibility to choose among suppliers of search results and ads. Google’s offerings complement the search services provided by Microsoft and Yahoo Gemini (Yahoo’s marketplace for search and native advertising). The Company also generates search revenue from a revenue sharing arrangement with Yahoo Japan for search technology and services and records the related revenue as reported. The Company recognizes revenue from display advertising on Yahoo Properties and Affiliate sites as impressions of or clicks on display advertisements are delivered. Impressions are delivered when a sold advertisement appears in pages viewed by users. Clicks are delivered when a user clicks on a native advertisement. Arrangements for these services generally have terms of up to one year and in some cases the terms may be up to three years. For display advertising on Affiliate sites, the Company pays Affiliates from the revenue generated from the display of these advertisements on the Affiliate sites. Traffic acquisition costs (“TAC”) are payments made to Affiliates and payments made to companies that direct consumer and business traffic to Yahoo Properties. The display revenue derived from these arrangements that involve traffic supplied by Affiliates is reported gross of the TAC paid to Affiliates (reported as cost of revenue—TAC) when the Company is the primary obligor to the advertisers who are the customers of the display advertising service. From time-to-time, the Company may offer customized display advertising solutions to advertisers. These customized display advertising solutions combine the Company’s standard display advertising with customized content, customer insights, and campaign analysis which are separate units of accounting. Due to the unique nature of these products, the Company may not be able to establish selling prices based on historical stand-alone sales or third-party evidence; therefore, the Company may use its best estimate to establish selling prices. The Company establishes best estimates within a range of selling prices considering multiple factors including, but not limited to, class of advertiser, size of transaction, seasonality, margin objectives, observed pricing trends, available online inventory, industry pricing strategies, and market conditions. The Company believes the use of the best estimates of selling price allows revenue recognition in a manner consistent with the underlying economics of the transaction. Other revenue includes listings-based services revenue, transaction revenue, royalties, patent licenses and fees revenue. Listings-based services revenue is generated from a variety of consumer and business listings-based services, including classified advertising such as Yahoo Local and other services. The Company recognizes listings-based services revenue when the services are performed. Transaction revenue is generated from facilitating commercial transactions through Yahoo Properties, principally from Yahoo Small Business, Yahoo Travel, and Yahoo Shopping. The Company recognizes transaction revenue when there is evidence that qualifying transactions have occurred. The Company also receives royalties from Yahoo Japan which are recognized when earned. Alibaba Group’s obligation to make royalty payments under the Technology and Intellectual Property License Agreement (the “TIPLA”) ceased on September 24, 2014 as a result of the Alibaba Group’s initial public offering (the “Alibaba Group IPO”) of American Depositary Shares (“ADSs”) and the Company’s recognition of the remaining TIPLA deferred revenue was completed on September 18, 2015. See Note 8—“Investments In Equity Interests Accounted For Using The Equity Method Of Accounting” for additional information on the revenue recognized related to the TIPLA. Fees revenue consists of revenue generated from a variety of consumer and business fee-based services as well as services for small businesses. The Company recognizes fees revenue when the services are performed. In all cases, revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed, and collectability of the related fee is reasonably assured. The Company’s arrangements generally do not include a provision for cancellation, termination, or refunds that would significantly impact revenue recognition. The Company accounts for cash consideration given to customers, for which it does not receive a separately identifiable benefit and cannot reasonably estimate fair value, as a reduction of revenue. Current deferred revenue is comprised of contractual billings in excess of recognized revenue and payments received in advance of revenue recognition. Long-term deferred revenue includes amounts received for which revenue will not be earned within the next 12 months. Cost of revenue—TAC. Cost of revenue—other. Amortization of Intangibles. Product Development. Advertising Costs. Restructuring Charges. These restructuring initiatives require management to make estimates in several areas including: (i) expenses for severance and other employee separation costs; (ii) realizable values of assets made redundant, obsolete, or excessive; and (iii) the ability to generate sublease income and to terminate lease obligations at the estimated amounts. Stock-Based Compensation Expense. Calculating stock-based compensation expense related to stock options requires the input of highly subjective assumptions, including the expected term of the stock options, stock price volatility, and the pre-vesting forfeiture rate of stock awards. The Company estimates the expected life of options granted based on historical exercise patterns, which the Company believes are representative of future behavior. The Company estimates the volatility of its common stock on the date of grant based on the implied volatility of publicly traded options on its common stock, with a term of one year or greater. The Company believes that implied volatility calculated based on actively traded options on its common stock is a better indicator of expected volatility and future stock price trends than historical volatility. The assumptions used in calculating the fair value of stock-based awards represent the Company’s best estimates, but these estimates involve inherent uncertainties and the application of management judgment. As a result, if factors change and the Company uses different assumptions, the Company’s stock-based compensation expense could be materially different in the future. In addition, the Company is required to estimate the expected pre-vesting award forfeiture rate, as well as the probability that performance conditions that affect the vesting of certain awards will be achieved, and only recognizes expense for those shares expected to vest. The Company estimates the forfeiture rate based on historical experience of the Company’s stock-based awards that are granted and cancelled before vesting. See Note 14—“Employee Benefits” for additional information. The Company uses the “with and without” approach in determining the order in which tax attributes are utilized. As a result, the Company recognizes a tax benefit from stock-based awards in additional paid-in capital only if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized. When tax deductions from stock-based awards are less than the cumulative book compensation expense, the tax effect of the resulting difference (“shortfall”) is charged first to additional paid-in capital, to the extent of the Company’s pool of windfall tax benefits, with any remainder recognized in income tax expense. The Company determined that it had a sufficient windfall pool available through the end of 2015 to absorb any shortfalls. In addition, the Company accounts for the indirect effects of stock-based awards on other tax attributes, such as the research tax credit, through the consolidated statements of operations. Recent Accounting Pronouncements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations,” which simplifies the accounting for measurement-period adjustments by eliminating the requirement to restate prior period financial statements for measurement period adjustments. The new guidance requires the cumulative impact of measurement period adjustments, including the impact on prior periods, to be recognized in the reporting period in which the adjustment is identified. The ASU is effective for public companies for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted for any interim and annual financial statements that have not yet been issued. The Company evaluated the effects of the ASU 2015-16 and elected to early adopt the ASU during the third quarter of 2015. The ASU will be applied prospectively to the acquisitions which require adjustments to the provisional amounts that occurred during the open measurement periods, regardless of the acquisition date. In November 2015, the FASB issued ASU No. 2015-17, “Balance Sheet Classification of Deferred Taxes,” which requires entities to present deferred tax assets and deferred tax liabilities as noncurrent in a classified balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. This ASU is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, and entities are permitted to apply either prospectively or retrospectively; early adoption is permitted. The Company evaluated the effects of the ASU 2015-17 and elected to early adopt the ASU during the fourth quarter of 2015. The ASU was applied retrospectively to provide a consistent financial statement presentation for all deferred tax assets and liabilities for the years ended December 31, 2014 and December 31, 2015. To conform to the current period presentation, the Company reclassified $253 million and $8 million, respectively, which were previously included in prepaid expense and other current assets and other accrued expenses and current liabilities for the year ended December 31, 2014. As a result of the reclassifications, year-end balances of other long-term assets and investments increased by $9 million and deferred and other long-term tax liabilities decreased by $236 million for the year ended December 31, 2014. In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities”. The new standard principally affects accounting standards for equity investments, financial liabilities where the fair value option has been elected, and the presentation and disclosure requirements for financial instruments. Upon the effective date of the new standards, all equity investments in unconsolidated entities, other than those accounted for using the equity method of accounting, will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification and therefore, no changes in fair value will be reported in other comprehensive income for equity securities with readily determinable fair values. The new guidance on the classification and measurement will be effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and early adoption is permitted. The Company is in the process of evaluating the impact of the adoption of ASU 2016-01 on the consolidated financial statements and currently anticipates the new guidance would significantly impact its Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income as the Company’s marketable equity securities, due primarily to Alibaba Group and Hortonworks, are currently classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income. In February 2016, the FASB issued ASU 2016-02, “Leases” which, for operating leases, requires a lessee to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The standard also requires a lessee to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term, on a generally straight-line basis. The ASU is effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the effects that the adoption of ASU 2016-02 will have on the Company’s consolidated financial statements and anticipates the new guidance will significantly impact its consolidated financial statements given the Company has a significant number of leases.

Marketable Securities Investmen

Marketable Securities Investments And Fair Value Disclosures	12 Months Ended
	Dec. 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 Gross Gross Estimated 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 December 31, 2015 Cost Gross Gross Estimated Government and agency securities $ 616,501 $ 24 $ (635 ) $ 615,890 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 4,589,799 292 (4,908 ) 4,585,183 Alibaba Group equity securities 2,713,483 28,458,878 — 31,172,361 Hortonworks equity securities 26,246 57,977 — 84,223 Other corporate equity securities 298 — (101 ) 197 Total available-for-sale marketable securities $ 7,946,327 $ 28,517,171 $ (5,644 ) $ 36,457,854 December 31, 2014 2015 Reported as: Short-term marketable securities $ 5,327,412 $ 4,225,112 Long-term marketable securities 2,230,892 975,961 Investment in Alibaba Group 39,867,789 31,172,361 Other long-term assets and investments 104,029 84,420 Total $ 47,530,122 $ 36,457,854 Short-term, highly liquid investments of $2 billion and $667 million as of December 31, 2014 and 2015, respectively, included in cash and cash equivalents on the 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 the years ended December 31, 2013, 2014 and 2015. The remaining contractual maturities of available-for-sale marketable debt securities were as follows (in thousands): December 31, 2014 2015 Due within one year $ 5,327,412 $ 4,225,112 Due after one year through five years 2,230,892 975,961 Total available-for-sale marketable debt securities $ 7,558,304 $ 5,201,073 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 Fair Unrealized Fair Value Unrealized 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 ) December 31, 2015 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Unrealized Fair Value Unrealized Government and agency securities $ 552,041 $ (635 ) $ — $ — $ 552,041 $ (635 ) Corporate debt securities, commercial paper, and bank certificates of deposit 2,415,347 (4,763 ) 99,214 (145 ) 2,514,561 (4,908 ) Total available-for-sale marketable debt securities $ 2,967,388 $ (5,398 ) $ 99,214 $ (145 ) $ 3,066,602 $ (5,543 ) The Company’s investment portfolio includes equity securities of Alibaba Group and Hortonworks, as well as liquid high-quality fixed income debt securities including government, agency and corporate debt, money market funds, commercial paper, certificates of deposit and time deposits with financial institutions. The fair value of any debt or equity security 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. Available-for-sale marketable debt securities 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 (2) 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 December 31, 2015 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 386,792 $ — $ — $ 386,792 Available-for-sale marketable debt securities: Government and agency securities (1) — 635,917 — 635,917 Commercial paper and bank certificates of deposit (1) — 1,844,494 — 1,844,494 Corporate debt securities (1) — 2,918,496 — 2,918,496 Time deposits (1) — 82,703 — 82,703 Available-for-sale equity securities: — — — Other corporate equity securities (2) 197 — — 197 Alibaba Group equity securities 31,172,361 — — 31,172,361 Hortonworks equity securities (2) 84,223 — — 84,223 Hortonworks warrants — — 78,861 78,861 Foreign currency derivative contracts (3) — 84,319 — 84,319 Financial assets at fair value $ 31,643,573 $ 5,565,929 $ 78,861 $ 37,288,363 Liabilities Foreign currency derivative contracts (3) — (5,661 ) — (5,661 ) Total financial assets and liabilities at fair value $ 31,643,573 $ 5,560,268 $ 78,861 $ 37,282,702 (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 consolidated balance sheets. (2) The Hortonworks equity securities and other corporate equity securities are classified as part of other long-term assets and investments on the consolidated balance sheets. (3) Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the 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 $1.5 billion, including contracts designated as net investment hedges of $1.2 billion, as of December 31, 2015. The amount of cash included in cash and cash equivalents as of December 31, 2014 and 2015 was $712 million and $965 million, respectively. 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 for the Company’s Level 3 financial asset was obtained using a Black-Scholes model. Activity between Levels of the Fair Value Hierarchy During the years ended December 31, 2014 and 2015, the Company did not make any transfers between Level 1, Level 2 and Level 3 assets or liabilities. Hortonworks Prior to the December 12, 2014 initial public offering of Hortonworks, the Company held an approximate 16 percent interest in Hortonworks with an investment balance of $26 million, which was accounted for as a cost method investment. Subsequent to the initial public offering, the Company owns 3.8 million unregistered shares. These shares were subject to a 6-months lock-up period which expired during 2015. These shares are accounted for as an available-for-sale security and had a fair value of $104 million and $84 million as of December 31, 2014 and 2015, respectively. The Company also holds warrants that vested upon the initial public offering of Hortonworks, which entitle the Company to purchase an aggregate of 3.7 million shares of Hortonworks common stock upon exercise of the warrants. The Company holds 6.5 million preferred warrants that are exercisable for 3.25 million shares of common stock at an exercise price of $0.01 per share, as well as 0.5 million common warrants that are exercisable for 0.5 million shares of common stock at an exercise price of $8.46 per share. These warrants had a fair value of $98 million and $79 million as of December 31, 2014 and 2015, respectively. The Company determined the estimated fair value of the warrants using the Black-Scholes model with the following assumptions: Preferred warrants Common warrants Years Ended December 31, Years Ended December 31, 2014 2015 2014 2015 Expected dividend yield 0 % 0 % 0 % 0 % Risk-free interest rate 1.71 % 1.78 % 2.20 % 2.25 % Expected volatility 46.0 % 46.0 % 46.0 % 46.0 % Expected life (in years) 5.50 4.50 8.44 7.44 During the year ended December 31, 2014, the Company recorded a gain of $57 million upon the initial public offering of Hortonworks through other comprehensive income on our consolidated balance sheet and a $41 million gain related to the mark to market of the warrants as of December 31, 2014, which was included within other income (expense), net in the consolidated statements of operations. During the year ended December 31, 2015, the Company recorded a loss of $19 million related to the mark to market of the respective warrants as of December 31, 2015, which was included within other income (expense), net in the Company’s consolidated statements of operations. Changes in the estimated fair value of the Hortonworks warrants are recorded through other income (expense), net in the Company’s consolidated statements of operations. Assets and Liabilities Measured 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 in 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 December 31, 2014 and December 31, 2015 were $1.2 billion and $1.3 billion, respectively. The estimated 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. Goodwill and Indefinite-Lived Intangible Assets The inputs used to measure the estimated fair value of goodwill and indefinite-lived intangible assets are classified as a Level 3 fair value measurement due to the significance of unobservable inputs using company-specific information. The valuation methodology used to estimate the fair value of goodwill and indefinite-lived intangible assets is discussed in Note 5—“Goodwill” and Note 6—“Intangible Assets, Net”. Other Investments As of December 31, 2014 and 2015, the Company held approximately $82 million and $83 million, respectively, 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 consolidated balance sheets. Such investments are reviewed periodically for impairment.

Consolidated Financial Statemen

Consolidated Financial Statement Details	12 Months Ended
	Dec. 31, 2015
Consolidated Financial Statement Details	Note 3 Consolidated Financial Statement Details Prepaid Expenses and Other Current Assets As of December 31, prepaid expenses and other current assets consisted of the following (in thousands): 2014 2015 Prepaid expenses $ 132,306 $ 87,843 Foreign currency forward and option contract assets 122,648 84,136 Other receivables non-trade 85,893 167,198 Restricted cash (*) 23,088 29,678 Income tax receivables 44,998 220,996 Other 11,274 12,941 Total prepaid expenses and other current assets $ 420,207 $ 602,792 (*) The amount represents customer funds received by the Company in connection with its online e-commerce services in the Asia Pacific region that are restricted in a separate bank account. Property and Equipment, Net As of December 31, property and equipment, net consisted of the following (in thousands): 2014 2015 Land $ 215,740 $ 215,740 Buildings 780,688 840,083 Leasehold improvements (*) 210,876 252,985 Computers and equipment (*) 1,839,033 2,143,413 Capitalized software and labor 658,762 643,758 Furniture and fixtures 74,992 86,418 Assets not yet in use 125,555 83,164 3,905,646 4,265,561 Less: accumulated depreciation and amortization (*) (2,417,962 ) (2,718,238 ) Total property and equipment, net $ 1,487,684 $ 1,547,323 (*) The Company recorded assets under capital leases, primarily for computers and equipment and leasehold improvements, which had gross carrying values of $76 million and $82 million as of December 31, 2014 and December 31, 2015, respectively. Accumulated amortization related to these capital leases totaled $66 million and $75 million as of December 31, 2014 and December 31, 2015, respectively. Other Long-Term Assets and Investments As of December 31, other long-term assets and investments consisted of the following (in thousands): 2014 2015 Deferred income taxes $ 35,123 $ 21,745 Investments in privately-held companies 82,354 82,610 Hortonworks equity securities and warrants 202,091 163,084 Foreign currency forward and option contracts 80,280 183 Restricted cash (*) 3,818 — Other 159,894 74,768 Total other long-term assets and investments $ 563,560 $ 342,390 (*) The amount represents letters of credit secured with cash. Other Accrued Expenses and Current Liabilities As of December 31, other accrued expenses and current liabilities consisted of the following (in thousands): 2014 2015 Accrued content, connection, traffic acquisition, and other costs $ 172,913 $ 252,612 Accrued compensation and related expenses 373,749 310,111 Income taxes payable ( ) (264,993 ) 4,181 Accrued professional service expenses 49,651 40,914 Accrued sales and marketing related expenses 16,424 40,876 Accrued restructuring costs 47,356 40,283 Current liability for uncertain tax contingencies 2,179 12,586 Other 260,430 233,095 Total other accrued expenses and current liabilities $ 657,709 $ 934,658 (*) Income taxes payable reflect amounts owed to taxing authorities, net of tax payments and other credits resulting from current period deductions. The December 31, 2014 balance excludes the income taxes payable related to the sale of Alibaba Group ADSs which is separately presented on the consolidated balance sheet. Deferred and Other Long-Term Tax Liabilities As of December 31, deferred and other long-term tax liabilities consisted of the following (in thousands): 2014 2015 Deferred and other income tax liabilities (1) $ 15,952,744 $ 12,312,013 Long-term liability for uncertain tax contingencies (2) 1,119,725 1,155,178 Total deferred and other long-term tax contingencies $ 17,072,469 $ 13,467,191 Presented as: Deferred tax liabilities related to investment in Alibaba Group (1) $ 16,154,906 $ 12,611,867 Deferred and other long-term tax liabilities $ 917,563 $ 855,324 (1) Deferred and other income tax liabilities are presented on a net basis by jurisdiction. The balances as of December 31, 2014 and December 31, 2015 include the deferred tax liabilities related to investment in Alibaba Group. (2) Includes interest and penalties. Accumulated Other Comprehensive Income As of December 31, the components of accumulated other comprehensive income were as follows (in thousands): 2014 2015 Unrealized gains on available-for-sale securities, net of tax $ 22,084,960 $ 16,918,539 Unrealized gains (losses) on cash flow hedges, net of tax 1,856 482 Foreign currency translation, net of tax (67,188 ) (342,990 ) Accumulated other comprehensive income $ 22,019,628 $ 16,576,031 Noncontrolling Interests As of December 31, noncontrolling interests were as follows (in thousands): 2014 2015 Beginning noncontrolling interests $ 55,688 $ 43,755 Distributions to noncontrolling interests (22,344 ) (15,847 ) Net income attributable to noncontrolling interests 10,411 7,975 Ending noncontrolling interests $ 43,755 $ 35,883 Other Income (Expense), Net Other income (expense), net for 2013, 2014, and 2015 were as follows (in thousands): Years Ended December 31, 2013 2014 2015 Interest, dividend, and investment income $ 57,544 $ 26,309 $ 34,383 Interest expense (14,319 ) (68,851 ) (71,865 ) Gain on sale of Alibaba Group ADSs — 10,319,437 — Gain (loss) on Hortonworks warrants — 98,062 (19,201 ) Foreign exchange losses (6,197 ) (14,687 ) (22,226 ) Other 6,329 9,169 3,127 Total other income (expense), net $ 43,357 $ 10,369,439 $ (75,782 ) Interest, dividend, and investment income consists of income earned from cash and cash equivalents in bank accounts, marketable debt securities, and dividend income on the Alibaba Group Preference Shares prior to the redemption of such shares in May 2013. Interest expense is related to the Notes and notes payable related to building and capital lease obligations for data centers. Gain on sale of Alibaba Group ADSs during the year ended December 31, 2014 is attributable to the pre-tax gain related to the sale of 140 million ADSs of Alibaba Group in the Alibaba Group IPO on September 24, 2014. During the year ended December 31, 2014, the Company recorded a gain of $57 million upon the initial public offering of Hortonworks and a $41 million gain related to the mark to market of the warrants as of December 31, 2014, which were included within other income (expense), net in the consolidated statements of operations. During the year ended December 31, 2015, the Company recorded a loss of $19 million related to the mark to market of the respective warrants as of December 31, 2015, which was included within other income (expense), net in the Company’s consolidated statements of operations. Changes in the estimated fair value of the Hortonworks warrants will be recorded through other income (expense), net in the Company’s consolidated statements of operations. See Note 2—“Marketable Securities, Investments and Fair Value Disclosures” for additional information. Foreign exchange losses consists of 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 consists of gains from other non-operational items. Reclassifications Out of Accumulated Other Comprehensive Income Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2013 were as follows (in thousands): Amount Affected Line Item in the Realized gains on cash flow hedges, net of tax $ (2,080 ) Revenue Realized gains on available-for-sale securities, net of tax (796 ) Other income (expense), net Total reclassifications for the period $ (2,876 ) Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2014 were as follows (in thousands): Amount Affected Line Item in the Realized gains on cash flow hedges, net of tax $ (5,259 ) Revenue Realized gains on available-for-sale securities, net of tax (2,218 ) Other income (expense), net Foreign currency translation adjustments (“CTA”): Disposal of a portion of the investment in Alibaba Group, net of $30 million in tax (50,301 ) Other income (expense), net Total reclassifications for the period $ (57,778 ) Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2015 were as follows (in thousands): Amount Affected Line Item in the Realized losses on cash flow hedges, net of tax $ 4,421 Revenue Realized losses on available-for-sale securities, net of tax 174 Other income (expense), net Total reclassifications for the period $ 4,595

Acquisitions And Dispositions

Acquisitions And Dispositions	12 Months Ended
	Dec. 31, 2015
Acquisitions And Dispositions	Note 4 Acquisitions And Dispositions The following table summarizes acquisitions (including business combinations and asset acquisitions) completed during the three years ended December 31, 2015 (in millions): Purchase Goodwill Amortizable 2013 Tumblr $ 990 $ 749 $ 263 Other acquisitions $ 279 $ 170 $ 95 2014 Flurry $ 270 $ 194 $ 55 BrightRoll $ 581 $ 417 $ 113 Other acquisitions $ 66 $ 39 $ 18 2015 Polyvore $ 161 $ 131 $ 19 Other acquisition $ 23 $ 22 $ 5 At the completion date of each acquisition, the Company recorded goodwill where the purchase price exceeded the fair value of the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is tested for impairment at the reporting unit level on an annual basis and more frequently if impairment indicators are present. As a result of the impairment testing performed on its reporting units as of October 31, 2015, the majority of the goodwill originating from these acquisitions was subsequently impaired. See Note 5—“Goodwill” for results of the goodwill impairment test. Transactions completed in 2013 Tumblr. The purchase price exceeded the fair value of the net tangible and identifiable intangible assets acquired and, as a result, the Company recorded goodwill in connection with this transaction. Under the terms of the agreement, the Company acquired all of the equity interests (including all outstanding vested options) in Tumblr. Tumblr stockholders and vested optionholders were paid in cash, outstanding Tumblr unvested options and restricted stock units were assumed and converted into equivalent awards covering Yahoo common stock and a portion of the Tumblr shares held by its founder were exchanged for Yahoo common stock. The total purchase price of approximately $990 million consisted mainly of cash consideration. The allocation of the purchase price of the assets acquired and liabilities assumed based on their fair values was as follows (in thousands): Cash and marketable securities acquired $ 16,587 Other tangible assets acquired 76,566 Amortizable intangible assets: Developed technology 23,700 Customer contracts and related relationships 182,400 Tradename 56,500 Goodwill 748,979 Total assets acquired 1,104,732 Liabilities assumed (114,521 ) Total $ 990,211 In connection with the acquisition, the Company is recognizing stock-based compensation expense of $70 million over a period of up to four years. This amount is comprised of assumed unvested stock options and restricted stock units (which had an aggregate fair value of $29 million at the acquisition date), and Yahoo common stock issued to Tumblr’s founder (which had a fair value of $41 million at the acquisition date). The Yahoo common stock issued to Tumblr’s founder is subject to holdback and will be released over four years provided he remains an employee of the Company. In addition, the transaction resulted in cash consideration of $40 million to be paid to Tumblr’s founder over four years, also provided that he remains an employee of the Company. Such cash payments are being recognized as compensation expense over the four-year service period. The amortizable intangible assets have useful lives not exceeding six years and a weighted average useful life of six years. The purchase price exceeded the estimated fair value of the tangible and identifiable intangible assets and liabilities acquired and, as a result of the allocation, the Company recorded goodwill of $749 million in connection with this transaction. Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired and is not deductible for tax purposes. This acquisition brings a community of users to the Yahoo Network by deploying Yahoo’s personalization technology and search infrastructure to deliver relevant content to the Tumblr user base. Other Acquisitions—Business Combinations. Transactions completed in 2014 Flurry. The total purchase price of approximately $270 million consisted of cash consideration. Under the terms of the agreement, the Company acquired all of the equity interests (including all outstanding vested options) of Flurry. Outstanding Flurry unvested options were assumed and converted into equivalent awards for Yahoo common stock valued at $4 million, which is being recognized as stock-based compensation expense as the options vest over periods of up to four years. In connection with the acquisition, the Company issued restricted stock units valued at $23 million, which are being recognized as stock-based compensation expense as the restricted stock units vest over four years. The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 12,139 Other tangible assets acquired 51,235 Amortizable intangible assets: Developed technology 7,100 Customer contracts and related relationships 47,600 Other 720 Goodwill 194,081 Total assets acquired 312,875 Liabilities assumed (43,205 ) Total $ 269,670 The amortizable intangible assets have useful lives not exceeding five years and a weighted average useful life of five years. The purchase price exceeded the estimated fair value of the tangible and identifiable intangible assets and liabilities acquired and, as a result of the allocation, the Company recorded goodwill of $194 million in connection with this transaction. Goodwill represents the excess of the purchase price over the estimated fair value of the net tangible and identifiable intangible assets acquired and is not deductible for tax purposes. BrightRoll. The purchase price of $581 million exceeded the estimated fair value of the net tangible and identifiable intangible assets and liabilities acquired and, as a result, the Company recorded goodwill of $417 million in connection with this transaction. Under the terms of the agreement, the Company acquired all of the equity interests (including all outstanding vested options) in BrightRoll and BrightRoll stockholders and vested option holders were paid in cash. Outstanding BrightRoll unvested options were assumed and converted into equivalent awards for Yahoo common stock valued at $25 million, which is being recognized as stock-based compensation expense as the options vest over periods of up to four years. In connection with the acquisition, the Company issued restricted stock units to employees valued at $78 million, which is being recognized as stock-based compensation expense as the restricted stock units vest over four years related to continuing employment. In addition, the transaction resulted in cash consideration of $54 million to be paid to BrightRoll’s founder over three years, also provided that he remains an employee of the Company. Such cash payments are being recognized as compensation expense over the three-year service period. The total purchase price of approximately $581 million consisted mainly of cash consideration. The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 41,899 Accounts receivable, net 99,330 Other tangible assets acquired 55,923 Amortizable intangible assets: Developed technology 19,400 Customer contracts and related relationships 85,600 Other 8,100 Goodwill 416,580 Total assets acquired 726,832 Liabilities assumed (145,667 ) Total $ 581,165 The amortizable intangible assets have useful lives not exceeding seven years and a weighted average useful life of five years. The purchase price exceeded the estimated fair value of the tangible and identifiable intangible assets and liabilities acquired and, as a result of the allocation, the Company recorded goodwill of $417 million in connection with this transaction. Goodwill represents the excess of the purchase price over the estimated fair value of the net tangible and identifiable intangible assets acquired and is not deductible for tax purposes. Other Acquisitions—Business Combinations. Transactions completed in 2015 Polyvore. The total purchase price of approximately $161 million consisted of cash consideration. Under the terms of the agreement, the Company acquired all of the equity interests (including all outstanding vested options) of Polyvore. Outstanding Polyvore unvested options were assumed and converted into equivalent awards for Yahoo common stock valued at $7 million, which is being recognized as stock-based compensation expense as the options vest over periods of up to four years. In connection with the acquisition, the Company is also recognizing stock-based compensation expense of $15 million over a period of four years. This amount is comprised of Yahoo common stock issued to the founders (which had a fair value of $15 million at the acquisition date). The Yahoo common stock held in escrow is issued to the founders and is subject to forfeiture and will be released over four years provided they remain employees of the Company. The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 6,019 Other tangible assets acquired 12,057 Amortizable intangible assets: Developed technology 17,550 Tradename 1,150 Customer contracts and related relationships 225 Goodwill 131,084 Total assets acquired 168,085 Liabilities assumed (7,503 ) Total $ 160,582 The amortizable intangible assets have useful lives not exceeding five years and a weighted average useful life of three years. The purchase price of $161 million exceeded the estimated fair value of the tangible and identifiable intangible assets and liabilities acquired and, as a result of the allocation, the Company recorded goodwill of $131 million in connection with this transaction. Goodwill represents the excess of the purchase price over the estimated fair value of the net tangible and identifiable intangible assets acquired and is not deductible for tax purposes. The entire goodwill amount was recorded in the Americas segment. Other Acquisitions— The Company’s business combinations completed during the years ended December 31, 2013, 2014 and 2015 did not have a material impact on the Company’s consolidated statements of operations and therefore proforma disclosures have not been presented. Patent Sale and License Agreement During 2014, the Company entered into a patent sale and license agreement for total cash consideration of $460 million. The total consideration was allocated based on the estimated relative fair value of each of the elements of the agreement: $61 million was allocated to the sale of patents (“Sold Patents”), $135 million to the license to existing patents (“Existing Patents”) and $264 million to the license of patents developed or acquired in the next five years (“Capture Period Patents”). The Company recorded $61 million as a gain on the Sold Patents during 2014. The gain on sale of these patents is recorded as a part of gain on sales of patents in the consolidated statements of operations. The amounts allocated to the license of the Existing Patents are being recorded as revenue over the four-year payment period under the license when payments are due. The amounts allocated to the Capture Period Patents are being recorded as revenue over the five-year capture period. The Company recognized $43 million and $86 million in revenue related to the Existing Patents and the Capture Period Patents during the years ended December 31, 2014 and 2015, respectively. Patent Sale Agreements During 2013 and 2014, the Company entered into patent sale agreements with a wholly-owned affiliate of Alibaba Group pursuant to which the Company sold certain patents for aggregate consideration of $70 million and $23.5 million, respectively. The gains on sales of these patents are recorded as a part of gain on sales of patents in the consolidated statements of operations. During 2014, the Company entered into a patent sale agreement with Yahoo Japan pursuant to which the Company sold certain patents for aggregate consideration of $18 million. The gain on sale of these patents of $12 million is recorded as a part of gain on sales of patents in the consolidated statements of operations. During 2015, the Company sold certain patents and recorded a gain on sales of patents of approximately $11 million.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2015
Goodwill	Note 5 Goodwill The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2015 were as follows (in thousands): Americas (1) EMEA (2) Asia Pacific (3) Total Net balance as of January 1, 2014 $ 3,802,334 $ 546,856 $ 330,458 $ 4,679,648 Acquisitions and related adjustments 522,156 110,857 (607 ) 632,406 Goodwill impairment charge — (79,135 ) (9,279 ) (88,414 ) Foreign currency translation adjustments (2,271 ) (46,109 ) (22,690 ) (71,070 ) Net balance as of December 31, 2014 $ 4,322,219 $ 532,469 $ 297,882 $ 5,152,570 Acquisitions and related adjustments 130,450 21,606 — 152,056 Goodwill impairment charge (3,929,576 ) (531,261 ) — (4,460,837 ) Foreign currency translation adjustments (4,207 ) (22,814 ) (8,654 ) (35,675 ) Net balance as of December 31, 2015 $ 518,886 $ — $ 289,228 $ 808,114 (1) Gross goodwill balances for the Americas segment were $3.8 billion as of January 1, 2014 and $4.4 billion as of December 31, 2015. The Americas segment includes accumulated impairment losses of $3.9 billion as of December 31, 2015. (2) Gross goodwill balances for the EMEA segment were $1.1 billion as of January 1, 2014 and $1.2 billion as of December 31, 2015. The EMEA segment includes accumulated impairment losses of $551 million as of January 1, 2014, and $1.2 billion as of December 31, 2015. (3) Gross goodwill balances for the Asia Pacific segment were $480 million as of January 1, 2014 and $448 million as of December 31, 2015. The Asia Pacific segment includes accumulated impairment losses of $150 million as of January 1, 2014 and $159 million as of December 31, 2015. Goodwill Impairment Testing Goodwill is not amortized but is evaluated for impairment annually (as of October 31) or whenever the Company identifies certain triggering events or circumstances that would more likely than not reduce the estimated fair value of a reporting unit below its carrying amount. Events or circumstances that might indicate an interim evaluation is warranted include, among other things, unexpected adverse business conditions, regulatory changes, loss of key personnel and reporting unit and macro-economic factors such as deterioration in general economic conditions, limitations on accessing capital, fluctuations in foreign exchange rates, or other developments in equity and credit markets. Goodwill is tested for impairment at the reporting unit level, which is one level below the Company’s operating segments. The Company identified U.S. & Canada, Latin America, and Tumblr as the reporting units below the Americas operating segment; Europe and Middle East as the reporting units below the EMEA operating segment; and Taiwan, Hong Kong, Australia & New Zealand, India & Southeast Asia as the reporting units below the Asia Pacific operating segment. These operating segments are the same as the Company’s reportable segments. To test for impairment, the Company uses the two-step quantitative test. Step One The first step of the quantitative test involves comparing the estimated fair value of the Company’s reporting units to their carrying values, including goodwill. In 2015, the estimated fair values of the reporting units for all reporting units identified, except for Tumblr and Latin America, were estimated using a combination of a market approach and an income approach, giving equal weighting to each. This combination is deemed to be the most indicative of the reporting units’ estimated fair value in an orderly transaction between market participants and is consistent with the methodology used for the goodwill impairment test in prior years. For the Tumblr reporting unit, the fair value was estimated using an income approach which was deemed to be the most indicative of fair value in an orderly transaction between market participants. For the Latin America reporting unit, the fair value was estimated using the market approach as the income approach yielded negative cash flows and was not deemed to be comparable. Under the market approach, the Company utilizes publicly-traded comparable company information to determine revenue and earnings multiples that are used to value our reporting units. Under the income approach, the Company determines fair value based on estimated future cash flows of each reporting unit discounted by an estimated weighted-average cost of capital, reflecting the overall level of inherent risk of a reporting unit and the rate of return an outside investor would expect to earn. The Company bases cash flow projections for each reporting unit using a forecast of cash flows and a terminal value based on the Perpetuity Growth Model. The forecast and related assumptions were derived from the most recent annual financial forecast for which the planning process commenced in the fourth quarter of 2015. The estimated fair values of the Company’s Taiwan, Hong Kong, and Australia & New Zealand reporting units exceeded their estimated carrying values and therefore goodwill in those reporting units was not impaired. In 2015, the carrying value exceeded the fair value for the following reporting units: U.S. & Canada, Europe, Tumblr and Latin America. Step Two For any reporting units, where the carrying value exceeds the estimated fair value, as determined in step one, the Company performs step two to measure the amount of impairment, if any. The second step of the quantitative test is performed by comparing the carrying value of the goodwill in the reporting unit to its implied fair value. The implied fair value is calculated by allocating all of the assets and liabilities of the reporting unit, including any unrecognized intangible assets, in a hypothetical analysis that calculates the implied fair value of goodwill in the same manner as if the reporting unit was being acquired in a business combination. An impairment charge is recognized for the excess of the carrying value of goodwill over its implied fair value. As identified above, in step one, in 2015, the carrying value of the U.S. & Canada, Europe, Tumblr and Latin America reporting units exceeded the estimated fair value. The Company completed an assessment of the implied fair value of these reporting units, which resulted in an impairment of all goodwill for the U.S. & Canada, Europe, and Latin America reporting units and a partial impairment for the Tumblr reporting unit. The Company recorded goodwill impairment charges of $3,692 million, $531 million, $230 million and $8 million, associated with the U.S. & Canada, Europe, Tumblr, and Latin America reporting units, respectively, for the year ended December 31, 2015. The impairments were a result of a combination of factors, including a sustained decrease in our market capitalization in fourth quarter of 2015 and lower estimated projected revenue and profitability in the near term. The lower estimated projected cash flows and higher discount rates were used to estimate the fair value of each reporting unit affected by such changes. The remaining goodwill as of December 31, 2015 was $808 million, of which $519 million relates to the Tumblr reporting unit. Given the partial impairment recorded in the Tumblr reporting unit in 2015, it is reasonably possible that changes in judgments, assumptions and estimates the Company made in assessing the fair value of goodwill could cause the Company to consider some portion or all of the remaining goodwill of the Tumblr reporting unit to become impaired. In addition, a future decline in market conditions and/or changes in the Company’s market share could negatively impact the market comparables, estimated future cash flows and discount rates used in the market and income approaches to determine the fair value of the reporting unit and could result in an impairment charge in the foreseeable future. In 2014, as a result of the annual goodwill impairment test, the Company concluded that the carrying value of the Middle East reporting unit, included in the EMEA reportable segment, and the carrying value of the India & Southeast Asia reporting unit included in the Asia Pacific reportable segment both exceeded their respective fair values. As required by the second step of the impairment test, the Company performed an allocation of the fair value to all the assets and liabilities of the reporting unit, including identifiable intangible assets, based on their estimated fair values, to determine the implied fair value of goodwill. Accordingly, the Company recorded a goodwill impairment charge related to the Middle East and India & Southeast Asia reporting units of $79 million and $9 million, respectively, during the quarter ended December 31, 2014 for the difference between the carrying value of the goodwill in the reporting unit and its implied fair value with no goodwill remaining in either reporting unit. The impairment resulted from a decline in business conditions in the Middle East and India & Southeast Asia during the latter half of 2014. In 2013, as a result of the annual goodwill impairment test, the Company concluded that the carrying value of the Middle East reporting unit, included in the EMEA reportable segment, exceeded its fair value. The Company recorded a goodwill impairment charge of approximately $64 million during the quarter ended December 31, 2013 for the difference between the carrying value of the goodwill in the reporting unit and its implied fair value with goodwill remaining of $77 million. The impairment resulted from a decline in business conditions in the Middle East during the latter half of 2013.

Intangible Assets, Net

Intangible Assets, Net	12 Months Ended
	Dec. 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 Gross Carrying Accumulated Net Customer, affiliate, and advertiser related relationships $ 369,914 $ (88,318 ) $ 281,596 Developed technology and patents 206,422 (83,748 ) 122,674 Tradenames, trademarks, and domain names 107,841 (41,269 ) 66,572 Total intangible assets, net $ 684,177 $ (213,335 ) $ 470,842 December 31, 2015 Gross Carrying Accumulated Net Customer, affiliate, and advertiser related relationships $ 355,568 $ (135,513 ) $ 220,055 Developed technology and patents 170,289 (83,380 ) 86,909 Tradenames, trademarks, and domain names 67,119 (26,814 ) 40,305 Total intangible assets, net $ 592,976 $ (245,707 ) $ 347,269 (*) Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million for the both years ended as of December 31, 2014 and 2015. The intangible assets have estimated useful lives as follows: • Customer, affiliate, and advertiser related relationships—two to six years; • Developed technology and patents—one to six years; and • Tradenames, trademarks, and domain names—one to seven years. The Company recognized amortization expense for intangible assets of $97 million, $132 million, and $137 million for 2013, 2014, and 2015, respectively, including $52 million, $65 million, and $58 million, respectively, included in cost of revenue-other. Based on the current amount of intangibles subject to amortization, the estimated amortization expense for each of the succeeding years is as follows: 2016: $114 million; 2017: $104 million; 2018: $84 million; 2019: $44 million; 2020 and cumulatively thereafter: $1 million. Intangibles Impairment Testing The Company reviews identifiable intangible assets to be held and used for impairment whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. Determination of recoverability is based on the lowest level of identifiable estimated undiscounted cash flows resulting from use of the asset and its eventual disposition. Intangible assets with indefinite useful lives are not amortized but are reviewed for impairment whenever events or changes in circumstances indicate that it is more likely than not that the fair value is less than its carrying amount. If the Company determines that an intangible asset with an indefinite life is more likely than not impaired, a quantitative test comparing the fair value of the indefinite-lived purchased intangible asset with its carrying amount is performed. The Company estimates the fair value of indefinite-lived purchased intangible assets using an income approach. Measurement of any impairment losses on both definite-lived and indefinite-lived intangible assets are based on the excess of the carrying value of the asset over its fair value. In the fourth quarter of 2015, the Company reviewed both definite-lived and indefinite-lived intangible assets for impairment. No impairment was identified for definite-lived intangibles. For indefinite-lived intangibles, the Company performed a quantitative test comparing the fair value of the indefinite-lived intangible assets with their carrying amount and recorded an impairment charge of $15 million related to certain indefinite-lived intangible assets in the EMEA segment.

Basic And Diluted Net Income (L

Basic And Diluted Net Income (Loss) Attributable To Yahoo! Inc. Common Stockholders Per Share	12 Months Ended
	Dec. 31, 2015
Basic And Diluted Net Income (Loss) Attributable To Yahoo! Inc. Common Stockholders Per Share	Note 7 Basic And Diluted Net Income (Loss) Attributable To Yahoo! Inc. Common Stockholders Per Share Basic and diluted net income (loss) 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 (loss) 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 deferred tax assets. The Company takes into account the effect on consolidated net income (loss) per share of dilutive securities of entities in which the Company holds equity interests that are accounted for using the equity method. For 2013 and 2014, potentially dilutive securities representing approximately 10 million and 3 million shares of common stock, respectively, 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 (loss) per share also does not include any effect from the note hedges. In future periods, the denominator for diluted net income (loss) 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 (loss) per share (in thousands, except per share amounts): Years Ended December 31, 2013 2014 2015 Basic: Numerator: Net income (loss) attributable to Yahoo! Inc. $ 1,366,281 $ 7,521,731 $ (4,359,082 ) Less: Net income allocated to participating securities (28 ) (68 ) — Net income (loss) attributable to Yahoo! Inc. common stockholders—basic $ 1,366,253 $ 7,521,663 $ (4,359,082 ) Denominator: Weighted average common shares 1,052,705 987,819 939,141 Net income (loss) attributable to Yahoo! Inc. common stockholders per share—basic $ 1.30 $ 7.61 $ (4.64 ) Diluted: Numerator: Net income (loss) attributable to Yahoo! Inc. $ 1,366,281 $ 7,521,731 $ (4,359,082 ) Less: Net income allocated to participating securities (28 ) (67 ) — Less: Effect of dilutive securities issued by equity investees (16,656 ) (43,689 ) — Net income (loss) attributable to Yahoo! Inc. common stockholders—diluted $ 1,349,597 $ 7,477,975 $ (4,359,082 ) Denominator: Denominator for basic calculation 1,052,705 987,819 939,141 Weighted average effect of Yahoo! Inc. dilutive securities: Restricted stock units 14,097 12,365 — Stock options and employee stock purchase plan (*) 4,009 3,924 — Denominator for diluted calculation 1,070,811 1,004,108 939,141 Net income (loss) attributable to Yahoo! Inc. common stockholders per share—diluted $ 1.26 $ 7.45 $ (4.64 ) (*) At the beginning of the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees. See Note 14—“Employee Benefits” for additional information.

Investments In Equity Interests

Investments In Equity Interests Accounted For Using The Equity Method Of Accounting	12 Months Ended
	Dec. 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 using the equity method of accounting as of December 31, 2014 and 2015 (dollars in thousands): December 31, Percent December 31, Percent Yahoo Japan $ 2,482,660 35.5 % $ 2,496,657 35.5 % Other 6,918 20 % 6,572 20 % Total $ 2,489,578 $ 2,503,229 Yahoo Japan During April 1996, the Company signed a joint venture agreement with Softbank, as amended in September 1997, which formed Yahoo Japan. Yahoo Japan was formed to establish and manage a local version of Yahoo in Japan. The investment in 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 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 consolidated statements of operations. The Company makes adjustments to the earnings in equity interests line in the consolidated statements of operations for any material differences between U.S. GAAP and International Financial Reporting Standards (“IFRS”) issued by the International Accounting Standards Board, 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 $8.3 billion as of December 31, 2015. During the years ended December 31, 2013, 2014 and 2015, the Company received cash dividends from Yahoo Japan in the amounts of $77 million, $84 million, and $142 million, net of withholding taxes, respectively, which were recorded as reductions to the Company’s investment in Yahoo Japan. During the year ended December 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. Any other differences between U.S. GAAP and IFRS did not have any material impact on the Yahoo Japan summarized financial information presented below (in thousands): Twelve Months Ended September 30, 2013 2014 2015 Operating data: Revenue $ 4,296,522 $ 4,046,412 $ 3,769,410 Gross profit $ 3,577,001 $ 3,262,450 $ 2,983,880 Income from operations $ 2,150,644 $ 1,896,368 $ 1,609,403 Net income $ 1,365,443 $ 1,236,583 $ 1,092,657 Net income attributable to Yahoo Japan $ 1,355,457 $ 1,225,221 $ 1,092,048 September 30, 2014 2015 Balance sheet data: Current assets $ 6,095,559 $ 6,150,688 Long-term assets $ 1,973,946 $ 2,430,699 Current liabilities $ 1,948,540 $ 2,003,960 Long-term liabilities $ 35,418 $ 245,834 Noncontrolling interests $ 66,998 $ 165,601 Since acquiring its equity interest in Yahoo Japan, the Company has recorded cumulative earnings in equity interests, net of dividends received and related taxes on dividends, of $3.3 billion and $3.7 billion as of December 31, 2014 and 2015, respectively. 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 $264 million, $253 million, and $228 million, respectively, for the years ended December 31, 2013, 2014, and 2015. As of December 31, 2014 and 2015, the Company had net receivable balances from Yahoo Japan of approximately $47 million and $37 million, respectively. Alibaba Group Equity Investment in Alibaba Group. Technology and Intellectual Property License Agreement.

Foreign Currency Derivative Fin

Foreign Currency Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2015
Foreign Currency Derivative Financial Instruments	Note 9 Foreign Currency Derivative Financial Instruments The Company uses derivative financial instruments, primarily forward contracts and option contracts, to mitigate risk associated with adverse movements in foreign currency exchange rates. The Company records all derivatives in the 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 consolidated statements of operations when the underlying hedged revenue is recognized. Any ineffective portions of net investment hedges and cash flow hedges are recorded in other income (expense), net on the Company’s consolidated statements of operations. For balance sheet hedges, changes in the fair value are recorded in other income (expense), net on the Company’s consolidated statements of operations. The Company enters into master netting arrangements, which are designed to reduce credit risk by permitting net settlement of foreign exchange contracts with the same counterparty, subject to applicable requirements. The Company presents its derivative assets and liabilities at their gross fair values on the consolidated balance sheets. 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. Cash Flow Hedges. Not Designated as Hedging Instruments Balance Sheet Hedges. Notional amounts of the Company’s outstanding derivative contracts as of December 31, 2013, 2014 and 2015 (in millions) were as follows: December 31, 2013 2014 2015 Derivatives designated as hedging instruments: Net investment hedge forward and option contracts $ 1,341 $ 1,647 $ 1,150 Cash flow hedge forwards $ 56 $ 222 $ 75 Derivatives not designated as hedging instruments: Balance sheet hedges $ 393 $ 243 $ 225 Foreign currency derivative activity for the year ended December 31, 2014 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 209 $ (234 ) $ — $ 210 (*) $ — $ 185 Cash flow hedges $ 4 $ (4 ) $ (1 ) $ 1 $ 8 $ 8 Derivatives not designated as hedging instruments: Balance sheet hedges $ — $ (12 ) $ 16 $ — $ — $ 4 (*) This amount does not reflect the tax impact of $79 million recorded during the twelve months ended December 31, 2014. The $131 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company’s consolidated balance sheets as of December 31, 2014. Foreign currency derivative activity for the year ended December 31, 2015 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 185 $ (117 ) $ 1 $ 5 (*) $ — $ 74 Cash flow hedges $ 8 $ — $ (1 ) $ (2 ) $ (3 ) $ 2 Derivatives not designated as hedging instruments: Balance sheet hedges $ 4 $ (21 ) $ 19 $ — $ — $ 2 (*) This amount does not reflect the tax impact of $2 million recorded during the twelve months ended December 31, 2015. The $3 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company’s consolidated balance sheets as of December 31, 2015. Foreign currency derivative contracts balance sheet location and ending fair value was as follows (in millions): Balance Sheet December 31, December 31, Derivatives designated as hedging instruments: Net investment hedges Asset (1) $ 190 $ 79 Liability (2) $ (5 ) $ (5 ) Cash flow hedges Asset (1) $ 8 $ 2 Liability (2) $ — $ — Derivatives not designated as hedging instruments: Balance sheet hedges Asset (1) $ 5 $ 3 Liability (2) $ (1 ) $ (1 ) (1) Included in prepaid expenses and other current assets or other long-term assets and investments on the consolidated balance sheets. (2) Included in accrued expenses and other current liabilities or other long-term liabilities on the consolidated balance sheets. See the Foreign Currency and Derivative Financial Instruments section within Note 1—“The Company and Summary of Significant Accounting Policies” for additional information.

Credit Agreement

Credit Agreement	12 Months Ended
	Dec. 31, 2015
Credit Agreement	Note 10 Credit Agreement The Company’s credit agreement with Citibank, N.A., as Administrative Agent entered into on October 19, 2012 (as amended on October 10, 2013, October 9, 2014, and July 24, 2015, 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 July 22, 2016, unless extended by the parties. Borrowings under the Credit Agreement, as amended, will continue to bear interest at a rate equal to, at the option of the Company, either (a) a customary London interbank offered rate (a “Eurodollar Rate”), or (b) a customary base rate (a “Base Rate”), in each case plus an applicable margin. The applicable margins for borrowings under the Credit Agreement, as amended, will be based upon the leverage ratio of the Company and range from 1.00 percent to 1.25 percent with respect to Eurodollar Rate borrowings and 0 percent to 0.25 percent with respect to Base Rate borrowings. As of December 31, 2015, the Company was in compliance with the financial covenants in the Credit Agreement and no amounts were outstanding.

Convertible Notes

Convertible Notes	12 Months Ended
	Dec. 31, 2015
Convertible Notes	Note 11 Convertible Notes 0.00% Convertible Senior Notes As of December 31, 2015, the Company had $1.4 billion principal amount of Notes outstanding. In 2013, the Company issued the Notes. The Notes were sold under a purchase agreement, dated November 20, 2013, with J.P. Morgan Securities LLC and Goldman, Sachs & Co., as representatives of the several initial purchasers named therein (collectively, the “Initial Purchasers”). The Notes were sold to the Initial Purchasers for resale to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. In connection with the issuance of the Notes, the Company entered into an indenture (the “Indenture”) with respect to the Notes with The Bank of New York Mellon Trust Company, N.A., as trustee. Under the Indenture, the Notes are senior unsecured obligations of Yahoo, the Notes do not bear regular interest. 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 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. Certain corporate events described in the Indenture may increase the conversion rate for holders who elect to convert their Notes in connection with such corporate event should they occur. 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 will deliver shares of its common stock in respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread). The conversion spread will be included in the denominator for the computation of diluted net income per common share, using the treasury stock method. As of December 31, 2015, none of the conditions allowing holders of the Notes to convert had been met. In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the estimated fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the face value of the Notes as a whole. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense over the term of the Notes using the effective interest method with an effective interest rate of 5.26 percent per annum. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the Note issuance, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Issuance costs attributable to the $1.4 billion liability component are being amortized to expense over the term of the Notes, and issuance costs attributable to the $306 million equity component were included with the equity component in stockholders’ equity. Additionally, the Company recorded a deferred tax liability of $37 million on a portion of the equity component transaction costs which are deductible for tax purposes. The Notes consist of the following (in thousands): December 31, December 31, Liability component: Principal $ 1,437,500 $ 1,437,500 Less: note discount (267,077 ) (204,015 ) Net carrying amount $ 1,170,423 $ 1,233,485 Equity component(*) $ 305,569 $ 305,569 (*) Recorded on the consolidated balance sheet within additional paid-in capital. The following table sets forth total interest expense recognized related to the Notes (in thousands): Years Ended December 31, 2013 2014 2015 Accretion of convertible note discount $ 4,846 $ 59,838 $ 63,061 The estimated 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 (the carrying value excludes the equity component of the Notes classified in equity) were as follows (in thousands): December 31, 2014 December 31, 2015 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 1,175,240 $ 1,170,423 $ 1,250,124 $ 1,233,485 Note Hedge Transactions and Warrant Transactions The Company entered into note hedge transactions with certain option counterparties (the “Option Counterparties”) to reduce the potential dilution with respect to Yahoo’s common stock upon conversion of the Notes or offset any cash payment the Company is required to make in excess of the principal amount of converted Notes. For the year ended December 31, 2013, the Company paid $206 million for the note hedge transactions. Separately, the Company also entered into privately negotiated warrant transactions with the Option Counterparties giving them the right to purchase common stock from the Company. The warrant transactions will have a dilutive effect with respect to Yahoo’s common stock to the extent that the market price per share of its common stock exceeds the strike price of $71.24 per share of the warrants on or prior to the expiration date of the warrants. The warrants begin to expire in March 2019. For the year ended December 31, 2013, the Company received $125 million in proceeds from the issuance of warrants. The note hedges and warrants are not marked to market. The value of the note hedges and warrants were initially recorded in stockholders’ equity and continue to be classified as stockholders’ equity.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments And Contingencies	Note 12 Commitments And Contingencies Lease Commitments. In December 2014, the Company entered into a 10-year lease agreement for three buildings in Los Angeles, California. As of December 31, 2015, the total expected minimum operating lease commitment is $40 million for two buildings and $20 million in construction liabilities for one building which is accounted for as a build-to-suit lease. The Company has the option to renew the lease for two consecutive renewal terms of either five years or seven years each. Rent expense for all operating leases was approximately $77 million, $86 million, and $77 million for 2013, 2014, and 2015, respectively. Many of the Company’s leases contain one or more of the following options which the Company can exercise at the end of the initial lease term: (i) renewal of the lease for a defined number of years at the then fair market rental rate or at a slight discount to the fair market rental rate; (ii) purchase of the property at the then fair market value; or (iii) right of first offer to lease additional space that becomes available. A summary of gross and net lease commitments as of December 31, 2015 was as follows (in millions): Gross Operating Sublease Net Operating Years ending December 31, 2016 $ 121 $ (13 ) $ 108 2017 91 (11 ) 80 2018 63 (8 ) 55 2019 48 (6 ) 42 2020 35 (3 ) 32 Due after 5 years 104 (5 ) 99 Total gross and net lease commitments $ 462 $ (46 ) $ 416 Capital Years ending December 31, 2016 $ 15 2017 10 2018 9 2019 5 2020 — Due after 5 years — Gross capital lease commitments $ 39 Less: interest 6 Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities $ 33 Affiliate Commitments. Non-cancelable Obligations. Intellectual Property Rights. Construction Liabilities Note Payable Obligations. Standby Letters of Credit. Other Commitments. As of December 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. Legal Contingencies General. Patent Matters. Stockholder and Securities Matters. In re Yahoo! Inc. Derivative Shareholder Litigation In re Yahoo! Inc. Shareholder Derivative Litigation 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 purported to represent a class of investors who purchased the Company’s common stock between April 19, 2011 and July 29, 2011, and alleged 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 purported 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 sought unspecified damages, injunctive and equitable relief, fees, and costs. On August 10, 2012, the District Court granted defendants’ motion to dismiss the consolidated amended complaint. Plaintiffs appealed. On May 15, 2015, the U.S. Court of Appeals for the Ninth Circuit affirmed the dismissal. On April 22, 2015, a stockholder action captioned Cathy Buch v. David Filo, et al On January 27, 2016, a stockholder action captioned UCFW Local 1500 Pension Fund v. Marissa Mayer, et al Mexico Matters. 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 plaintiffs’ petition was denied. Plaintiffs then filed an additional petition seeking to reverse the denial through further review. On September 22, 2015, the Supreme Court of Mexico issued its written decision denying that petition. This decision concludes plaintiffs’ appeals in Mexico. 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. TCPA Litigation Concerning Yahoo Messenger. 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 remaining Mexico matter, would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Amounts accrued as of December 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.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity	Note 13 Stockholders’ Equity The Board has the authority to issue up to 10 million shares of preferred stock and to determine the price, rights, preferences, privileges, and restrictions, including voting rights, of those shares without any further vote or action by the stockholders. Stock Repurchases . During the year ended December 31, 2015, the Company repurchased approximately 4 million shares of its common stock under its November 2013 program at an average price of $47.65 per share for a total of $204 million. In September and October 2014, the Company entered into two unrelated accelerated share repurchase agreements (“ASR”) with a financial institution to repurchase shares of its common stock. Under the September 2014 agreement, the Company prepaid $1.1 billion and approximately 15 million shares were initially delivered to the Company on September 30, 2014 and are included in treasury stock. Final settlement occurred on October 17, 2014, resulting in a total of approximately 23.5 million shares, inclusive of shares initially delivered, repurchased for $933 million, all of which are included in treasury stock. The Company received a return of cash for the remaining amount not settled in shares of $167 million. Under the October 2014 agreement, the Company prepaid the maximum repurchase amount of $1.0 billion and approximately 15 million shares were initially delivered on October 30, 2014. Final settlement occurred on December 9, 2014, resulting in a total of approximately 16 million shares, inclusive of shares initially delivered, repurchased for $800 million, all of which are included in treasury stock. The Company received a return of cash for the remaining amount not settled in shares of $200 million. Both ASR agreements were entered into pursuant to the Company’s existing share repurchase program. The Company accounted for the September 2014 ASR as two separate transactions: (i) approximately 15 million shares of common stock initially delivered to the Company, and $600 million was accounted for as a treasury stock transaction and (ii) the remaining $500 million unsettled portion of the contract was determined to be a forward contract indexed to the Company’s own common stock. The initial delivery of approximately 15 million shares resulted in an immediate reduction, on the delivery date, of the outstanding shares used to calculate the weighted-average common shares outstanding for basic and diluted net income per share. The Company has determined that the forward contract, indexed to its common stock, met all of the applicable criteria for equity classification. The Company recorded $600 million as treasury stock and recorded $500 million, the implied value of the forward contract, in additional paid-in capital on the consolidated balance sheets as of September 30, 2014. As the remainder of the shares were delivered to the Company, in the fourth quarter of 2014, the forward contract was reclassified from additional paid-in capital to treasury stock for the value of the additional shares received, and additional paid-in capital was debited for the cash returned for the remaining amount of shares not settled. During the year ended December 31, 2014, in addition to the repurchase under the ASR’s, the Company repurchased approximately 62 million shares of its common stock under its stock repurchase program at an average price of $39.30 per share for a total of approximately $2.4 billion. During the year ended December 31, 2013, the Company repurchased approximately 129 million shares of its common stock under a previous stock repurchase program approved by the Company’s Board in May 2012 at an average price of $25.95 per share for a total of $3.3 billion. These repurchases included the Company’s repurchase of 40 million shares of its common stock beneficially owned by Third Point LLC on July 25, 2013. These shares were repurchased pursuant to a purchase agreement entered into on July 22, 2013, prior to the market opening for trading in Yahoo stock, and at $29.11 per share, which was the closing price of the Company’s common stock on July 19, 2013. The total purchase price for these shares was $1.2 billion. The repurchase transaction was funded primarily with cash as well as borrowings of $150 million under the Company’s unsecured revolving credit facility that have been repaid. The May 2012 stock repurchase program was exhausted during the first quarter of 2014. Retirements.

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2015
Employee Benefits	Note 14 Employee Benefits Benefit Plans . Stock Plans . Options granted under the Stock Plan before May 19, 2005 generally expire 10 years after the grant date, and options granted after May 19, 2005 generally expire seven years after the grant date. Options generally become exercisable over a four-year period based on continued employment and vest either monthly, quarterly, semi-annually, or annually. The Stock Plan permits the granting of restricted stock and restricted stock units (collectively referred to as “restricted stock awards”). The restricted stock award vesting criteria are generally the passing of time, meeting certain performance-based objectives, or a combination of both, and continued employment through the vesting period (which varies but generally does not exceed four years). Restricted stock award grants are generally measured at fair value on the date of grant based on the number of shares granted and the quoted price of the Company’s common stock. Such value is recognized as an expense over the corresponding service period. The Stock Plan provides for the issuance of a maximum of 784 million shares of which 97 million shares were still available for award grant purposes as of December 31, 2015. Each share of the Company’s common stock issued in settlement of “full-value awards” (which include all awards other than options and stock appreciation rights) granted on or after June 25, 2009 under the Stock Plan counted as 1.75 shares against the Stock Plan’s share limit. Each share of the Company’s common stock issued in settlement of “full-value awards” granted on or after June 25, 2014 under the Stock Plan is counted as 2.5 shares against the Stock Plan’s share limit. The Directors’ Plan provides for the grant of nonqualified stock options and restricted stock units to non-employee directors of the Company. The Directors’ Plan provides for the issuance of up to 9 million shares of the Company’s common stock, of which approximately 5 million were still available for award grant purposes as of December 31, 2015. Each share of the Company’s common stock issued in settlement of restricted stock units granted after the Company’s 2006 annual meeting of shareholders under the Directors’ Plan is counted as 1.75 shares against the Directors’ Plan’s share limit. Options granted under the Directors’ Plan before May 25, 2006 generally become exercisable, based on continued service as a director, for initial grants to new directors, in equal monthly installments over four years, and for annual grants, with 25 percent of such options vesting on the one year anniversary of the date of grant and the remaining options vesting in equal monthly installments over the remaining 36-month period thereafter. Such options generally expire seven to 10 years after the grant date. Options granted on or after May 25, 2006 become exercisable, based on continued service as a director, in equal quarterly installments over one year. Such options generally expire seven years after the grant date. Restricted stock units granted under the Directors’ Plan generally vest in equal quarterly installments over a one-year period following the date of grant and, once vested, are generally payable in an equal number of shares of the Company’s common stock on the earlier of the end of the one-year vesting period or the date the director ceases to be a member of the Board (subject to any deferral election that may be made by the director). Non-employee directors are also permitted to elect an award of restricted stock units or a stock option under the Directors’ Plan in lieu of a cash payment of their quarterly Board retainer and any cash fees for serving on committees of the Board. Such stock options or restricted stock unit awards granted in lieu of cash fees are fully vested on the grant date. From time to time, the Company also assumes stock-based awards in connection with corporate mergers and acquisitions, which awards become payable in shares of the Company’s common stock. Employee Stock Purchase Plan . For the years ended December 31, 2013, 2014, and 2015, stock-based compensation expense related to the activity under the plan was $16 million, $12 million, and $2 million, respectively. As of December 31, 2015, there was no unamortized stock-based compensation expense related to the Company’s Employee Stock Purchase Plan. Stock Options Shares Weighted Weighted Aggregate Outstanding at December 31, 2014 (1) 9,225 $ 18.57 4.33 $ 274,072 Options granted — $ — Options assumed in acquisitions 407 $ 11.89 Options exercised (2) (2,168 ) $ 16.23 Options expired (585 ) $ 19.09 Options cancelled/forfeited (357 ) $ 19.75 Outstanding at December 31, 2015 (1) 6,522 $ 18.82 4.03 $ 103,230 Vested and expected to vest, at December 31, 2015 (3) 6,338 $ 17.48 3.98 $ 100,310 Exercisable at December 31, 2015 3,925 $ 17.40 3.42 $ 62,553 (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. (3) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total outstanding options. The weighted average grant date fair values of all options granted and assumed in the years ended December 31, 2013, 2014, and 2015 were $18.72, $31.31, and $20.31 per share, respectively. The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the aggregate difference between the closing stock price of the Company’s common stock on December 31, 2015 and the exercise price for in-the-money options) that would have been received by the option holders if all in-the-money options had been exercised on December 31, 2015. The total intrinsic values of options exercised in the years ended December 31, 2013, 2014, and 2015 were $122 million, $167 million, and $53 million, respectively. As of December 31, 2015, there was $17 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. Cash received from option exercises and purchases of shares under the Employee Stock Purchase Plan for the year ended December 31, 2015 was $59 million. The total net tax benefit attributable to stock options exercised in the year ended December 31, 2015 was $15 million. The fair value of option grants, including assumed options from acquisitions, is determined using the Black-Scholes option pricing model with the following weighted average assumptions: Stock Options Purchase Plan (5) Years Ended December 31, Years Ended December 31, 2013 2014 2015 2013 2014 Expected dividend yield (1) 0 % 0 % 0 % 0 % 0 % Risk-free interest rate (2) 0.7 % 1.4 % 0.9 % 0.1 % 0 % Expected volatility (3) 33.3 % 34.5 % 34.5 % 31.7 % 36.8 % Expected life (in years) (4) 3.60 3.83 2.50 0.25 0.25 (1) The Company currently has no history or expectation of paying cash dividends on its common stock in the near future. (2) The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected term of the awards in effect at the time of grant. (3) The Company estimates the volatility of its common stock at the date of grant based on the implied volatility of publicly traded options on its common stock, with a term of one year or greater. (4) The expected life of stock options granted under the Plans is based on historical exercise patterns, which the Company believes are representative of future behavior. New grants issued by the Company had an expected life of 4 years in 2013 and 4 years in 2014. In 2015, the Company did not issue new stock options. Options assumed in acquisitions had expected lives of less than 3 years. (5) Assumptions for the Employee Stock Purchase Plan relate to the annual average of the enrollment periods. During the year ended December 31, 2012, enrollment was permitted in May and November of each year. Beginning in 2013, enrollment was permitted in February, May, August, and November of each year. During the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees. Restricted Stock and Restricted Stock Units Shares Weighted Average Awarded and unvested at December 31, 2014 (1) 40,677 $ 32.38 Granted (2) 16,899 $ 41.53 Assumed in acquisitions — $ — Vested (16,969 ) $ 29.61 Forfeited (11,868 ) $ 32.99 Awarded and unvested at December 31, 2015 (1) 28,739 $ 39.15 (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 year ended December 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 year ended December 31, 2015. As of December 31, 2015, there was $685 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 2.3 years. The total fair value of restricted stock awards vested during the years ended December 31, 2013, 2014, and 2015 was $220 million, $415 million, and $502 million, respectively. During the year ended December 31, 2015, 17 million shares that were subject to previously granted restricted stock units vested. These vested restricted stock awards were net share settled. The Company withheld 7 million shares 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 $258 million for the year ended December 31, 2015 and are reflected as a financing activity within the 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. In 2013, 2014, and 2015, $64 million, $150 million, and $58 million, respectively, of excess tax benefits from stock-based awards for options exercised and restricted stock awards that vested in current and prior periods were included as a source of cash flows from financing activities. These excess tax benefits represent the reduction in income taxes otherwise payable during the period, attributable to the actual gross tax benefits in excess of the expected tax benefits for options exercised and restricted stock awards that vested in current and prior periods. The Company has accumulated excess tax deductions relating to stock options exercised and restricted stock awards that vested prior to January 1, 2006 available to reduce income taxes otherwise payable. To the extent such deductions reduce income taxes payable in the current year, they are reported as financing activities in the consolidated statements of cash flows. Performance-Based Executive Incentive Equity Awards CEO 2012 Annual Equity Awards . After 2012, Ms. Mayer is eligible to receive annual equity grants when such grants are made to senior executives. Subject to the discretion of the Compensation and Leadership Development Committee of the Board of Directors (the “Compensation Committee”), the Company contemplates that the target value of such awards will not be less than the target value of her 2012 annual grant. CEO One-Time Retention Award. CEO Make-Whole Restricted Stock Units. Performance Options. Performance RSUs.

Restructuring Charges, Net

Restructuring Charges, Net	12 Months Ended
	Dec. 31, 2015
Restructuring Charges, Net	Note 15 Restructuring Charges, Net Restructuring charges, net consists of employee severance pay and related costs, accelerations of stock-based compensation expense, facility restructuring costs, contract termination and other non-cash charges associated with the exit of facilities, as well as reversals of restructuring charges arising from changes in estimates. For the years ended December 31, 2013, 2014, and 2015, restructuring charges, net was comprised of the following (in thousands): Year Ended December 31, 2013 2014 2015 Employee severance pay and related costs $ 12,337 $ 30,749 $ 69,042 Non-cancelable lease, contract termination, and other charges 15,822 79,317 36,526 Reversals of previous charges (24,940 ) (3,222 ) (7,404 ) Non-cash accelerations of stock-based compensation expense — — 2,705 Other non-cash charges (credits), net 547 (3,394 ) 3,150 Restructuring charges, net $ 3,766 $ 103,450 $ 104,019 Although the Company does not allocate restructuring charges to its segments, the amounts of the restructuring charges relating to each segment are presented below. For the years ended December 31, 2013, 2014, and 2015, restructuring charges, net consists of the following (in thousands): Year Ended December 31, 2013 2014 2015 Americas $ 571 $ 76,134 $ 68,637 EMEA 2,862 25,612 31,251 Asia Pacific 333 1,704 4,131 Restructuring charges, net $ 3,766 $ 103,450 $ 104,019 The Company has implemented multiple 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. The Company’s restructuring accrual activity for the years ended December 31, 2014 and 2015 is summarized as follows (in thousands): Total Accrual balance as of December 31, 2013 $ 30,096 Restructuring charges 103,450 Cash paid (52,301 ) Foreign currency translation and other adjustments 2,363 Accrual Balance as of December 31, 2014 $ 83,608 Restructuring charges 104,019 Cash paid (114,749 ) Non-cash accelerations of stock-based compensation expense (2,705 ) Foreign currency translation and other adjustments (4,282 ) Accrual Balance as of December 31, 2015 $ 65,891 The $66 million restructuring liability as of December 31, 2015 consisted of $15 million for employee severance expenses, which the Company expects to pay out by the end of the second quarter of 2017, and $51 million related to non-cancelable lease costs, which the Company expects to pay over the terms of the related obligations through the fourth quarter of 2025, less estimated sublease income. As of December 31, restructuring accruals were included on the Company’s consolidated balance sheets as follows (in thousands): 2014 2015 Accrued expenses and other current liabilities $ 47,356 $ 40,283 Other long-term liabilities 36,252 25,608 Total restructuring accruals $ 83,608 $ 65,891 As of December 31, restructuring accruals by segment consisted of the following (in thousands): 2014 2015 Americas $ 65,949 $ 47,054 EMEA 16,797 18,389 Asia Pacific 862 448 Total restructuring accruals $ 83,608 $ 65,891 See Note 20—“Subsequent Events” for additional information.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Taxes	Note 16 Income Taxes The components of income (loss) before income taxes and earnings in equity interests are as follows (in thousands): Years Ended December 31, 2013 2014 2015 United States $ 538,824 $ 10,572,290 $ (4,394,462 ) Foreign 94,459 (59,909 ) (429,814 ) Income (loss) before income taxes and earnings in equity interests $ 633,283 $ 10,512,381 $ (4,824,276 ) The provision (benefit) for income taxes is composed of the following (in thousands): Years Ended December 31, 2013 2014 2015 Current: United States federal $ 138,032 $ 3,067,395 $ (89,498 ) State 49,872 454,261 9,426 Foreign 49,790 50,573 32,815 Total current provision (benefit) for income taxes $ 237,694 $ 3,572,229 $ (47,257 ) Deferred: United States federal (63,166 ) 348,887 (20,507 ) State (22,498 ) 120,938 (31,374 ) Foreign 1,362 (3,952 ) 9,540 Total deferred provision (benefit) for income taxes $ (84,302 ) $ 465,873 $ (42,341 ) Provision (benefit) for income taxes $ 153,392 $ 4,038,102 $ (89,598 ) The provision (benefit) for income taxes differs from the amount computed by applying the federal statutory income tax rate to income before income taxes and earnings in equity interests as follows (in thousands): Years Ended December 31, 2013 2014 2015 Income tax at the U.S. federal statutory rate of 35 percent $ 221,648 $ 3,679,333 $ (1,688,496 ) State income taxes, net of federal benefit 23,000 400,824 (7,912 ) Stock-based compensation expense 16,015 8,132 9,508 Research tax credits (18,036 ) (23,775 ) (15,659 ) Effect of non-U.S. operations (47,968 ) (53,079 ) 165,203 Settlement with tax authorities (46,943 ) (24,870 ) (1,981 ) Remeasurement of prior year tax positions (24,246 ) — (5,286 ) Acquisition related non-deductible expenses 9,296 16,881 15,970 Tax liquidation of acquired entities — — (56,170 ) Goodwill impairment charge 22,244 30,945 1,486,792 Intangible Impairment — — 2,468 Other (1,618 ) 3,711 5,965 Provision (benefit) for income taxes $ 153,392 $ 4,038,102 $ (89,598 ) Deferred income taxes reflect the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of deferred income tax assets and liabilities are as follows (in thousands): December 31, 2014 2015 Deferred income tax assets: Net operating loss and tax credit carryforwards $ 156,385 $ 185,425 Stock-based compensation expense 55,951 34,644 Non-deductible accrued expenses 118,457 114,519 Deferred revenue 90,023 10,153 Fixed assets 18,059 14,096 Federal benefits relating to tax positions 320,185 308,347 Other 8,104 8,580 Gross deferred income tax assets 767,164 675,764 Valuation allowance (23,853 ) (29,001 ) Deferred income tax assets $ 743,311 $ 646,763 Deferred income tax liabilities: Purchased intangible assets $ (200,569 ) $ (86,905 ) Fixed assets (174,196 ) (146,234 ) Alibaba unrealized gains (16,154,906 ) (12,611,867 ) Unrealized income in investments (75,368 ) (85,761 ) Restructuring liabilities (8,224 ) (4,046 ) Other (3,271 ) (2,216 ) Deferred income tax liabilities $ (16,616,534 ) $ (12,937,029 ) Net deferred income tax liabilities $ (15,873,223 ) $ (12,290,266 ) As of December 31, 2015, the Company’s federal and California net operating loss carryforwards for income tax purposes were approximately $338 million and $152 million, respectively. The federal and state net operating loss carryforwards are subject to various limitations under Section 382 of the Internal Revenue Code and applicable state tax law. If not utilized, the federal and California net operating loss carryforwards will begin to expire in 2021. In the three months ended March 31, 2015, the Company satisfied the $3.3 billion income tax liability related to the sale by Yahoo! Hong Kong Holdings Limited, our wholly-owned subsidiary, of Alibaba Group ADSs in the Alibaba Group IPO on September 24, 2014. As of December 31, 2015 the Company accrued deferred tax liabilities of $12.6 billion associated with the 384 million ordinary shares of Alibaba Group (“Alibaba Group shares”) retained by the Company. Such deferred tax liabilities are subject to periodic adjustments due to changes in the fair value of the Alibaba Group shares. On December 18, 2015, the Protecting Americans from Tax Act of 2015 was signed into law, extending 2015 federal research and development credit. As such, the provision for income taxes for the year ended December 31, 2015 reflects the benefit of the 2015 federal research and development tax credit. The Company’s state research tax credit carryforward for income tax purposes is approximately $168 million and it can be carried forward indefinitely. Tax credit carryforwards that result from the exercise of employee stock options are not recorded on the Company’s consolidated balance sheets and are accounted for as a credit to additional paid-in capital if and when realized through a reduction in income taxes payable. The income tax receivable as of December 31, 2015 increased from December 31, 2014 primarily due to a loss incurred in 2015 that can be carried back to earlier years for a cash tax refund for U.S. federal income tax purposes. The Company has a valuation allowance of approximately $24 million and $29 million as of December 31, 2014 and 2015 against certain deferred income tax assets that are not more likely than not to be realized in future periods. In evaluating the Company’s ability to realize its deferred income tax assets, the Company considers all available positive and negative evidence, including operating results, ongoing tax planning, and forecasts of future taxable income on a jurisdiction by jurisdiction basis. The valuation allowance as of December 31, 2015 relates to certain foreign and some U.S. states deferred tax assets that are not more likely than not to be realized. The Company continues to monitor its business strategies, weighing positive and negative evidences in assessing its realization of deferred tax assets. In 2012, the Company made a one-time distribution of foreign earnings resulting in an overall net benefit of $117 million. During 2013, the Company recorded an additional net benefit of $36 million related to this distribution. In 2014, the Company recorded a detriment of $8 million to account for the corresponding adjustments from the IRS on foreign earnings available at the time of the 2012 repatriation. As of December 31, 2015, the Company does not anticipate a repatriation of its undistributed foreign earnings of approximately $3.3 billion. Those earnings are principally related to its equity method investment in Yahoo Japan. If these earnings were to be repatriated in the future, the Company may be subject to additional U.S. income taxes. It is not practicable to determine the income tax liability that might be incurred if these earnings were to be repatriated. The total amount of gross unrecognized tax benefits was $1.1 billion as of December 31, 2015, of which up to $0.7 billion would affect the Company’s effective tax rate if realized. A reconciliation of the beginning and ending amount of unrecognized tax benefits in 2013, 2014, and 2015 is as follows (in thousands): 2013 2014 2015 Unrecognized tax benefits balance at January 1 $ 727,367 $ 695,285 $ 1,023,626 Gross increase for tax positions of prior years 69,188 65,606 27,583 Gross decrease for tax positions of prior years (40,298 ) (9,954 ) (17,748 ) Gross increase for tax positions of current year 34,556 358,434 41,428 Settlements (94,640 ) (84,942 ) (4,700 ) Lapse of statute of limitations (888 ) (803 ) (3,080 ) Unrecognized tax benefits balance at December 31 $ 695,285 $ 1,023,626 $ 1,067,109 The remaining balances are recorded on the Company’s consolidated balance sheets as follows (in thousands): December 31, 2014 2015 Total unrecognized tax benefits balance $ 1,023,626 $ 1,067,109 Amounts netted against related deferred tax assets (53,500 ) (64,601 ) Unrecognized tax benefits recorded on consolidated balance sheets $ 970,126 $ 1,002,508 Amounts classified as accrued expenses and other current liabilities $ 2,179 $ 12,586 Amounts classified as deferred and other long-term tax liabilities, net 967,947 989,922 Unrecognized tax benefits recorded on consolidated balance sheets $ 970,126 $ 1,002,508 The Company’s gross amount of unrecognized tax benefits as of December 31, 2015 increased by $43 million from the recorded balance as of December 31, 2014 primarily related to transfer prices among entities in different tax jurisdictions. The Company recognizes interest and/or penalties related to uncertain tax positions in income tax expense. To the extent accrued interest and penalties do not ultimately become payable, amounts accrued will be reduced and reflected as a reduction of the overall income tax provision in the period that such determination is made. During 2013, 2014 and 2015, interest and penalties recorded in the consolidated statements of operations were a charge of $21 million (net of interest received of $4 million), $83 million and $7 million, respectively. The amounts of accrued interest and penalties recorded on the consolidated balance sheets as of December 31, 2014 and 2015 were approximately $159 million and $167 million, respectively. On July 27, 2015, the United States Tax Court issued an opinion in Altera Corp. et al. v. Commissioner 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 2014. As of December 31, 2015, the Company’s 2011 through 2013 U.S. federal income tax returns are currently under examination. The Company has appealed 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 are expected to be resolved in the foreseeable future. The Company believes that it has adequately provided for any reasonably foreseeable adverse adjustment to its tax returns and that any settlement will not have a material adverse effect on its consolidated financial position, results of operations, or cash flows. It is reasonably possible that the Company’s unrecognized tax benefits could be reduced by up to approximately $149 million in the next twelve months. 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. 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 as of December 31, 2015 totals approximately $92 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.

Transactions With Related Parti

Transactions With Related Parties	12 Months Ended
	Dec. 31, 2015
Transactions With Related Parties	Note 17 Transactions With Related Parties Revenue from related parties, excluding Yahoo Japan, represented approximately 1 percent of total revenue for the years ended December 31, 2013, 2014, and 2015. Management believes that the terms of the agreements with these related parties are comparable to the terms obtained in arm’s-length transactions with unrelated similarly situated customers of the Company. See Note 8—“Investments in Equity Interests Accounted for Using the Equity Method of Accounting” for additional information related to transactions involving Yahoo Japan.

Segments

Segments	12 Months Ended
	Dec. 31, 2015
Segments	Note 18 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, revenue ex-TAC (which is defined as revenue less cost of revenue—TAC), direct costs excluding TAC by segment, and consolidated income (loss) 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): Years Ended December 31, 2013 2014 2015 Revenue by segment: Americas $ 3,481,502 $ 3,517,861 $ 3,976,770 EMEA 385,186 374,833 343,646 Asia Pacific 813,692 725,439 647,885 Total Revenue 4,680,380 4,618,133 4,968,301 TAC by segment: Americas 158,974 166,545 788,725 EMEA 42,915 36,867 57,284 Asia Pacific 52,553 14,119 31,505 Total TAC 254,442 217,531 877,514 Revenue ex-TAC by segment: Americas 3,322,528 3,351,316 3,188,045 EMEA 342,271 337,966 286,362 Asia Pacific 761,139 711,320 616,380 Total Revenue ex-TAC 4,425,938 4,400,602 4,090,787 Direct costs by segment (1) Americas 256,945 283,594 319,744 EMEA 89,478 87,490 95,789 Asia Pacific 196,832 198,910 196,054 Global operating costs (2)(3) 2,398,388 2,566,954 2,547,368 Gains on sales of patents (79,950 ) (97,894 ) (11,100 ) Asset impairment charge — — 44,381 Goodwill impairment charge 63,555 88,414 4,460,837 Intangibles impairment charge — — 15,423 Restructuring charges, net 3,766 103,450 104,019 Depreciation and amortization 628,778 606,568 609,613 Stock-based compensation expense 278,220 420,174 457,153 Income (loss) from operations $ 589,926 $ 142,942 $ (4,748,494 ) (1) Direct costs for each segment include costs associated with the local sales teams and other cost of revenue. (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. (3) The net cost reimbursements from Microsoft pursuant to the Search Agreement are primarily included in global operating costs. Operating costs and expenses consist of cost of revenue-TAC; cost of revenue-other; sales and marketing, product development; general and administrative; amortization of intangible assets; and restructuring charges, net. Cost of revenue-other consists of bandwidth costs and other expenses associated with the production and usage of Yahoo Properties, including content expense and amortization of acquired intellectual property rights and developed technology. Years Ended December 31, 2013 2014 2015 Capital expenditures, net: Americas $ 309,215 $ 357,512 $ 490,780 EMEA 11,435 20,034 25,479 Asia Pacific 17,481 18,069 26,728 Total capital expenditures, net $ 338,131 $ 395,615 $ 542,987 December 31, 2014 2015 Property and equipment, net: Americas: U.S. $ 1,382,597 $ 1,447,995 Other 787 353 Total Americas $ 1,383,384 $ 1,448,348 EMEA 34,649 33,940 Asia Pacific 69,651 65,035 Total property and equipment, net $ 1,487,684 $ 1,547,323 See also Note 5—“Goodwill” and Note 15—“Restructuring Charges, Net” for additional information regarding segments. Enterprise Wide Disclosures: The following table presents revenue for groups of similar services (in thousands): Years Ended December 31, 2013 2014 2015 Search $ 1,741,791 $ 1,792,861 $ 2,084,139 Display 1,949,830 1,868,035 2,074,161 Other 988,759 957,237 810,001 Total revenue $ 4,680,380 $ 4,618,133 $ 4,968,301 Years Ended December 31, 2013 2014 2015 Revenue: U.S. $ 3,317,794 $ 3,380,310 $ 3,865,772 International 1,362,586 1,237,823 1,102,529 Total revenue $ 4,680,380 $ 4,618,133 $ 4,968,301 Revenue is attributed to individual countries according to the online property that generated the revenue. No single foreign country accounted for more than 10 percent of the Company’s revenue in 2013, 2014, and 2015, respectively.

Search Agreement With Microsoft

Search Agreement With Microsoft Corporation	12 Months Ended
	Dec. 31, 2015
Search Agreement With Microsoft Corporation	Note 19 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 all devices. 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 revenue share before deduction of the Affiliate site’s share of revenue. The Affiliate site’s share of revenue is deducted from the Company’s 93 percent Revenue Share Rate. Additionally, pursuant to the Eleventh Amendment, the Company has the ability in response to queries on both personal computers and mobile devices 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 pays Microsoft serving costs but not a revenue share. In other cases and with respect to the Volume Commitment, the Revenue Share Rate applies. Previously under the Search Agreement, Yahoo had sales exclusivity for both the Company’s and Microsoft’s premium advertisers. Pursuant to the Eleventh Amendment to the Search Agreement, this sales exclusivity terminated on July 1, 2015. The Company and Microsoft are transitioning premium advertisers for Microsoft’s paid search services to Microsoft on a market-by-market basis. As of December 31, 2015, such transition was continuing for markets in North America and Europe. The term of the Search Agreement is 10 years from its commencement date, February 23, 2010, subject to earlier termination as provided in the Search Agreement. As of 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 currently 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 as the underlying search advertising services are provided by Microsoft. Approximately 31 percent, 35 percent, and 35 percent of the Company’s revenue for the years ended December 31, 2013, 2014 and, 2015, respectively, was attributable to the Search Agreement. As of December 31, 2014 and 2015, the Company had collected total amounts of $52 million and nil, respectively, on behalf of Microsoft and Microsoft’s 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 $267 million, which is included in accounts receivable, net, as of December 31, 2014 and 2015, respectively. 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.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events	Note 20 Subsequent Events Restructuring Charges. The Company estimates that in connection with this action it will incur related pre-tax cash charges of $40 million to $48 million for severance pay expenses and related cash expenditures. The Company estimates that it will incur pre-tax cash charges of $17 million to $21 million related to the consolidation and exit of facilities related to non-cancelable lease costs and other related costs. Non-cancelable lease costs were determined based on the present value of remaining lease payments reduced by estimated sublease income. In addition, the Company estimates that it will incur pre-tax non-cash charges of $6 million to $8 million related to stock-based compensation expense and $1 million related to impairment costs. The Company estimates that it will incur a total of $64 million to $78 million in pre-tax charges, as discussed above, in connection with the planned action. The Company expects to recognize most of the pre-tax charges in the first quarter of 2016. Approximately $57 million to $69 million of the total charges are expected to result in future cash expenditures.

Schedule II-Valuation and Quali

Schedule II-Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2015
Schedule II-Valuation and Qualifying Accounts	Schedule II—Valuation and Qualifying Accounts Years Ended December 31, 2013, 2014, and 2015 Balance at Charged to Write-Offs Balance (In thousands) Accounts receivable Allowance for doubtful accounts 2013 $ 32,635 $ 10,278 $ (7,364 ) $ 35,549 2014 $ 35,549 $ 15,406 $ (11,156 ) $ 39,799 2015 $ 39,799 $ 26,793 $ (9,089 ) $ 57,503 Balance at Charged Charged Balance (In thousands) Deferred tax asset valuation allowance 2013 $ 51,503 $ (4,595 ) $ (10,218 ) $ 36,690 2014 $ 36,690 $ (10,427 ) $ (2,410 ) $ 23,853 2015 $ 23,853 $ 7,150 $ (2,002 ) $ 29,001 (*) Amounts not charged (credited) to expenses are charged (credited) to stockholders’ equity, deferred tax assets (liabilities), or goodwill.

Selected Quarterly Financial Da

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2015
Selected Quarterly Financial Data	Selected Quarterly Financial Data (Unaudited) Quarters Ended March 31, (1) June 30, (2) September 30, (3) December 31, (4) March 31, (5) June 30, (6) September 30, (7) December 31, (8) (In thousands, except per share amounts) Revenue $ 1,132,730 $ 1,084,191 $ 1,148,140 $ 1,253,072 $ 1,225,970 $ 1,243,265 $ 1,225,673 $ 1,273,393 Total operating expenses $ 1,102,551 $ 1,045,754 $ 1,105,968 $ 1,220,918 $ 1,313,324 $ 1,288,059 $ 1,311,985 $ 5,803,427 Income (loss) from operations $ 30,179 $ 38,437 $ 42,172 $ 32,154 $ (87,354 ) $ (44,794 ) $ (86,312 ) $ (4,530,034 ) Other income (expense), net $ (13,453 ) $ (13,589 ) $ 10,308,931 $ 87,550 $ (31,063 ) $ (11,741 ) $ (23,955 ) $ (9,023 ) (Provision) benefit for income taxes $ (4,217 ) $ (8,143 ) $ (3,973,402 ) $ (52,340 ) $ 40,900 $ (58,495 ) $ 93,208 $ 13,985 Earnings in equity interests $ 301,402 $ 255,852 $ 398,692 $ 101,917 $ 99,690 $ 95,841 $ 95,195 $ 92,845 Net income (loss) attributable to Yahoo! Inc. $ 311,578 $ 269,707 $ 6,774,102 $ 166,344 $ 21,198 $ (21,554 ) $ 76,261 $ (4,434,987 ) Net income (loss) attributable to Yahoo! Inc. common stockholders per share—basic $ 0.31 $ 0.27 $ 6.82 $ 0.18 $ 0.02 $ (0.02 ) $ 0.08 $ (4.70 ) Net income (loss) attributable to Yahoo! Inc. common stockholders per share—diluted $ 0.29 $ 0.26 $ 6.70 $ 0.17 $ 0.02 $ (0.02 ) $ 0.08 $ (4.70 ) Shares used in per share calculation— basic 1,009,890 999,765 993,543 948,079 934,748 937,569 940,822 943,425 Shares used in per share calculation— diluted 1,031,420 1,014,692 1,007,693 962,626 947,976 937,569 946,934 943,425 (1) Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million. (2) Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million. (3) Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million. (4) Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million. (5) Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million. (6) Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million. (7) Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million. (8) Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.

The Company And Summary Of Si31

The Company And Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Basis of Presentation	Basis of Presentation. At the beginning of 2015, the Company began classifying 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 nil and $89 million, respectively, in internal website editorial costs previously included in sales and marketing expense to cost of revenue—other for the years ended December 31, 2013 and 2014. Also, at the beginning of 2015, the Company began classifying non-data center facilities-related costs within general and administrative expense. To conform to the current period presentation, the Company reclassified $51 million and $51 million, respectively, in facilities-related costs previously included in product development expense and $47 million and $61 million, respectively, previously included in sales and marketing expense to general and administrative expense for the years ended December 31, 2013 and 2014. Prior to the adoption of Accounting Standard Update (“ASU”) 2015-16, “Business Combinations,” in the third quarter of 2015, the Company identified measurement-period adjustments of $11 million to previous purchase accounting estimates for acquisitions, which were primarily related to the finalization of tax and other adjustments. These adjustments were immaterial and applied retrospectively to the acquisition dates. Accordingly, the Company’s consolidated balance sheet as of December 31, 2014 has been updated to reflect the effects of the measurement-period adjustments. The Company revised the 2014 Consolidated Statement of Cash Flows to correct for a non-cash acquisition of property and equipment resulting in an increase in cash provided by operating activities of $23 million and a corresponding decrease in net cash provided by investing activities. 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, originally developed content, acquired content, 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.
Concentration of Risk	Concentration of Risk. The fair value of the equity investments in Alibaba Group and Hortonworks will vary over time and is subject to a variety of market risks including: company performance, macro-economic, regulatory, industry, 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 the Company’s investments in marketable securities, including Alibaba Group and Hortonworks changes. Accounts receivable are typically unsecured and are derived from revenue earned from customers. The Company performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. Historically, such losses have been within management’s expectations. The Company’s derivative instruments, including the convertible note hedge transactions, expose the Company to credit risk to the extent that its derivative counterparties become unable to meet their financial obligations under the terms of the agreements. The Company seeks to mitigate this risk by limiting its derivative counterparties to major financial institutions and by spreading the risk across several major financial institutions. In addition, the potential risk of loss with any one counterparty resulting from this type of credit risk is monitored on an ongoing basis. See “Note 9—Foreign Currency Derivative Financial Instruments” for additional information related to the Company’s derivative instruments. The Company also holds warrants in Hortonworks, which expose the Company to variability in fair value based on changes in the stock price as an input to the Black-Scholes model. Revenue under the Company’s Search and Advertising Sales Agreement (as amended, the “Search Agreement”) with Microsoft Corporation (“Microsoft”) represented approximately 31 percent, 35 percent, and 35 percent of the Company’s revenue for the years ended December 31, 2013, 2014 and, 2015, respectively, and no other individual customer accounted for 10 percent or more of the Company’s revenue for 2013, 2014, or 2015. As of December 31, 2014 and 2015, no one customer accounted for 10 percent or more of the accounts receivable balance.
Comprehensive Income (Loss)	Comprehensive Income (loss).
Foreign Currency	Foreign Currency.
Cash and Cash Equivalents, Short- and Long-Term Marketable Securities	Cash and Cash Equivalents, Short- and Long-Term Marketable Securities. Operating cash deposits held with banks may exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risk by spreading such risk across multiple counterparties and monitoring the risk profiles of these counterparties. The Company’s marketable equity securities, including Alibaba Group and Hortonworks, are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income. The change in the classification of the Company’s investments in Alibaba Group and Hortonworks to available-for-sale marketable securities exposes the Company’s investment portfolio to increased equity price risk. The Company evaluates the marketable equity securities periodically for possible other-than-temporary impairment. A decline of fair value below cost basis is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire cost basis. In those instances, an impairment charge equal to the difference between the fair value and the cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell the marketable equity securities, an impairment is considered other-than-temporary if the Company does not expect to recover the entire cost basis; in those instances, a loss equal to the difference between fair value and the cost basis of the marketable equity security is recognized in earnings. Realized gains or losses and declines in value judged to be other-than-temporary, if any, on available-for-sale securities are reported in other income, net. The Company evaluates its marketable debt investments periodically for possible other-than-temporary impairment. A decline of fair value below amortized costs of debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. In those instances, an impairment charge equal to the difference between the fair value and the amortized cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell a debt security, an impairment is considered other-than-temporary if the Company does not expect to recover the entire amortized cost basis; in those instances, a credit loss equal to the difference between the present value of the cash flows expected to be collected based on credit risk and the amortized cost basis of the debt security is recognized in earnings. The Company has no current requirement or intent to sell a material portion of debt securities as of December 31, 2015. The Company expects to recover up to (or beyond) the initial cost of investment for securities held. In computing realized gains and losses on available-for-sale securities, the Company determines cost based on amounts paid, including direct costs such as commissions to acquire the security, using the specific identification method. During the years ended December 31, 2013, 2014 and 2015, gross realized gains and losses on available-for-sale marketable debt and equity securities were not material.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts.
Foreign Currency Derivative Financial Instruments	Foreign Currency Derivative Financial Instruments. For derivatives designated as cash flow hedges, the effective portion of the unrealized gains or losses on these forward contracts is recorded in accumulated other comprehensive income on the Company’s consolidated balance sheets and reclassified into revenue in the consolidated statements of operations when the underlying hedged revenue is recognized. If the cash flow hedges were to become ineffective, the ineffective portion would be immediately recorded in other income (expense), net in the Company’s consolidated statements of operations. 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 balance sheet hedges are used to partially offset the foreign currency exchange gains and losses generated by the re-measurement of certain assets and liabilities denominated in non-functional currency. Changes in the fair value of these derivatives are recorded in other income (expense), net on the Company’s consolidated statements of operations. The fair values of the balance sheet hedges are determined using quoted observable inputs. The Company recognizes all derivative instruments as other assets or liabilities on the Company’s consolidated balance sheets at fair value. See Note 9—“Foreign Currency Derivative Financial Instruments” for a full description of the Company’s derivative financial instrument activities and related accounting.
Property and Equipment	Property and Equipment. Property and equipment to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. Determination of recoverability is based on the lowest level of identifiable estimated undiscounted future cash flows resulting from the use of the asset and its eventual disposition. Measurement of any impairment loss for long-lived assets that management expects to hold and use is based on the excess of the carrying value of the asset over its fair value. No impairments of such assets were identified during any of the periods presented.
Capitalized Software and Labor	Capitalized Software and Labor.
Goodwill	Goodwill.
Intangible Assets	Intangible Assets.
Originally Developed Content and Acquired Content	Originally Developed Content and Acquired Content. For originally developed content, the Company performs regular recoverability assessments on a program-by-program basis. If there are any events or changes in circumstances indicating that the Company should assess whether the fair value of originally developed content is less than its unamortized costs, the Company performs a fair value analysis using an expected cash flow approach. The amount by which the unamortized costs of the originally developed content exceed estimated fair value is charged to expense as an asset impairment. During the year ended December 31, 2015, the Company recorded an asset impairment charge of $16 million related to originally developed content. For acquired content, the Company compares the net realizable value on a program-by-program basis with the unamortized cost. The amount by which the unamortized costs of the acquired content exceed net realizable value is charged to expense as an asset impairment. During the year ended December 31, 2015, the Company recorded an asset impairment charge of $28 million related to acquired content, primarily driven by a reduction of forecasted revenues to be generated from advertising on Yahoo Properties.
Investments in Equity Interests	Investments in Equity Interests. The Company reviews its investments for other-than-temporary impairment whenever events or changes in business circumstances indicate that the carrying value of the investment may not be fully recoverable. Investments identified as having an indication of impairment are subject to further analysis to determine if the impairment is other-than-temporary and this analysis requires estimating the fair value of the investment. The determination of fair value of the investment involves considering factors such as the stock prices of public companies in which the Company has an equity investment, current economic and market conditions, the operating performance of the companies including current earnings trends and forecasted cash flows, and other company and industry specific information.
Leasing	Leasing. The Company establishes assets and liabilities for the estimated construction costs incurred under build-to-suit lease arrangements to the extent the Company is involved in the construction of structural improvements or take construction risk prior to commencement of a lease. Upon the right to control the facilities under build-to-suit leases, the Company assesses whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance. If the Company continues to be the deemed owner, the facilities are accounted for as finance leases.
Income Taxes	Income Taxes. Significant judgment is required in evaluating the Company’s uncertain tax positions and determining its provision for income taxes. The Company establishes liabilities for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. These liabilities are established when the Company believes that certain positions might be challenged despite its belief that its tax return positions are in accordance with applicable tax laws. The Company adjusts these liabilities when new information becomes available, such as the closing of a tax audit, new tax legislation, developments in case law or interactions with the tax authorities. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the effect of changes to liabilities for tax-related uncertainties that are considered appropriate, as well as the related net interest and penalties. Income taxes paid, net of refunds received, were $208 million, $90 million, and $3 billion in the years ended December 31, 2013, 2014, and 2015, respectively. Interest paid was not material in any of the years presented. See Note 16—“Income Taxes” for additional information.
Revenue Recognition	Revenue Recognition. 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 to the Search Agreement, the Revenue Share Rate increased to 93 percent, but Microsoft now receives its 7 percent revenue share before deduction of the Affiliate site’s share of revenue. The Affiliate site’s share of revenue is deducted from the Company’s 93 percent Revenue Share Rate. As the Company is not the primary obligor in the arrangement with the advertisers and publishers, the amounts paid to Affiliates are recorded as a reduction of revenue. See Note 19—“Search Agreement with Microsoft Corporation” for a description of the Search Agreement with Microsoft. The Company recognizes search revenue generated from mobile ads served through Yahoo Gemini to Yahoo Properties and Affiliate sites. The search revenue generated from mobile ads served through Yahoo Gemini that involve traffic supplied by Affiliates is reported gross of the TAC paid to Affiliates (reported as cost of revenue—TAC) as the Company performs the search service for advertisers. Accordingly, the Company is considered the primary obligor to the advertisers who are the customers of the search advertising service. In October 2015, Yahoo reached an agreement with Google that provides Yahoo with additional flexibility to choose among suppliers of search results and ads. Google’s offerings complement the search services provided by Microsoft and Yahoo Gemini (Yahoo’s marketplace for search and native advertising). The Company also generates search revenue from a revenue sharing arrangement with Yahoo Japan for search technology and services and records the related revenue as reported. The Company recognizes revenue from display advertising on Yahoo Properties and Affiliate sites as impressions of or clicks on display advertisements are delivered. Impressions are delivered when a sold advertisement appears in pages viewed by users. Clicks are delivered when a user clicks on a native advertisement. Arrangements for these services generally have terms of up to one year and in some cases the terms may be up to three years. For display advertising on Affiliate sites, the Company pays Affiliates from the revenue generated from the display of these advertisements on the Affiliate sites. Traffic acquisition costs (“TAC”) are payments made to Affiliates and payments made to companies that direct consumer and business traffic to Yahoo Properties. The display revenue derived from these arrangements that involve traffic supplied by Affiliates is reported gross of the TAC paid to Affiliates (reported as cost of revenue—TAC) when the Company is the primary obligor to the advertisers who are the customers of the display advertising service. From time-to-time, the Company may offer customized display advertising solutions to advertisers. These customized display advertising solutions combine the Company’s standard display advertising with customized content, customer insights, and campaign analysis which are separate units of accounting. Due to the unique nature of these products, the Company may not be able to establish selling prices based on historical stand-alone sales or third-party evidence; therefore, the Company may use its best estimate to establish selling prices. The Company establishes best estimates within a range of selling prices considering multiple factors including, but not limited to, class of advertiser, size of transaction, seasonality, margin objectives, observed pricing trends, available online inventory, industry pricing strategies, and market conditions. The Company believes the use of the best estimates of selling price allows revenue recognition in a manner consistent with the underlying economics of the transaction. Other revenue includes listings-based services revenue, transaction revenue, royalties, patent licenses and fees revenue. Listings-based services revenue is generated from a variety of consumer and business listings-based services, including classified advertising such as Yahoo Local and other services. The Company recognizes listings-based services revenue when the services are performed. Transaction revenue is generated from facilitating commercial transactions through Yahoo Properties, principally from Yahoo Small Business, Yahoo Travel, and Yahoo Shopping. The Company recognizes transaction revenue when there is evidence that qualifying transactions have occurred. The Company also receives royalties from Yahoo Japan which are recognized when earned. Alibaba Group’s obligation to make royalty payments under the Technology and Intellectual Property License Agreement (the “TIPLA”) ceased on September 24, 2014 as a result of the Alibaba Group’s initial public offering (the “Alibaba Group IPO”) of American Depositary Shares (“ADSs”) and the Company’s recognition of the remaining TIPLA deferred revenue was completed on September 18, 2015. See Note 8—“Investments In Equity Interests Accounted For Using The Equity Method Of Accounting” for additional information on the revenue recognized related to the TIPLA. Fees revenue consists of revenue generated from a variety of consumer and business fee-based services as well as services for small businesses. The Company recognizes fees revenue when the services are performed. In all cases, revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed, and collectability of the related fee is reasonably assured. The Company’s arrangements generally do not include a provision for cancellation, termination, or refunds that would significantly impact revenue recognition. The Company accounts for cash consideration given to customers, for which it does not receive a separately identifiable benefit and cannot reasonably estimate fair value, as a reduction of revenue. Current deferred revenue is comprised of contractual billings in excess of recognized revenue and payments received in advance of revenue recognition. Long-term deferred revenue includes amounts received for which revenue will not be earned within the next 12 months.
Cost of revenue-TAC	Cost of revenue—TAC.
Cost of revenue-other	Cost of revenue—other.
Amortization of Intangibles	Amortization of Intangibles.
Product Development	Product Development.
Advertising Costs	Advertising Costs.
Restructuring Charges	Restructuring Charges. These restructuring initiatives require management to make estimates in several areas including: (i) expenses for severance and other employee separation costs; (ii) realizable values of assets made redundant, obsolete, or excessive; and (iii) the ability to generate sublease income and to terminate lease obligations at the estimated amounts.
Stock-Based Compensation Expense	Stock-Based Compensation Expense. Calculating stock-based compensation expense related to stock options requires the input of highly subjective assumptions, including the expected term of the stock options, stock price volatility, and the pre-vesting forfeiture rate of stock awards. The Company estimates the expected life of options granted based on historical exercise patterns, which the Company believes are representative of future behavior. The Company estimates the volatility of its common stock on the date of grant based on the implied volatility of publicly traded options on its common stock, with a term of one year or greater. The Company believes that implied volatility calculated based on actively traded options on its common stock is a better indicator of expected volatility and future stock price trends than historical volatility. The assumptions used in calculating the fair value of stock-based awards represent the Company’s best estimates, but these estimates involve inherent uncertainties and the application of management judgment. As a result, if factors change and the Company uses different assumptions, the Company’s stock-based compensation expense could be materially different in the future. In addition, the Company is required to estimate the expected pre-vesting award forfeiture rate, as well as the probability that performance conditions that affect the vesting of certain awards will be achieved, and only recognizes expense for those shares expected to vest. The Company estimates the forfeiture rate based on historical experience of the Company’s stock-based awards that are granted and cancelled before vesting. See Note 14—“Employee Benefits” for additional information. The Company uses the “with and without” approach in determining the order in which tax attributes are utilized. As a result, the Company recognizes a tax benefit from stock-based awards in additional paid-in capital only if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized. When tax deductions from stock-based awards are less than the cumulative book compensation expense, the tax effect of the resulting difference (“shortfall”) is charged first to additional paid-in capital, to the extent of the Company’s pool of windfall tax benefits, with any remainder recognized in income tax expense. The Company determined that it had a sufficient windfall pool available through the end of 2015 to absorb any shortfalls. In addition, the Company accounts for the indirect effects of stock-based awards on other tax attributes, such as the research tax credit, through the consolidated statements of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations,” which simplifies the accounting for measurement-period adjustments by eliminating the requirement to restate prior period financial statements for measurement period adjustments. The new guidance requires the cumulative impact of measurement period adjustments, including the impact on prior periods, to be recognized in the reporting period in which the adjustment is identified. The ASU is effective for public companies for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted for any interim and annual financial statements that have not yet been issued. The Company evaluated the effects of the ASU 2015-16 and elected to early adopt the ASU during the third quarter of 2015. The ASU will be applied prospectively to the acquisitions which require adjustments to the provisional amounts that occurred during the open measurement periods, regardless of the acquisition date. In November 2015, the FASB issued ASU No. 2015-17, “Balance Sheet Classification of Deferred Taxes,” which requires entities to present deferred tax assets and deferred tax liabilities as noncurrent in a classified balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. This ASU is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, and entities are permitted to apply either prospectively or retrospectively; early adoption is permitted. The Company evaluated the effects of the ASU 2015-17 and elected to early adopt the ASU during the fourth quarter of 2015. The ASU was applied retrospectively to provide a consistent financial statement presentation for all deferred tax assets and liabilities for the years ended December 31, 2014 and December 31, 2015. To conform to the current period presentation, the Company reclassified $253 million and $8 million, respectively, which were previously included in prepaid expense and other current assets and other accrued expenses and current liabilities for the year ended December 31, 2014. As a result of the reclassifications, year-end balances of other long-term assets and investments increased by $9 million and deferred and other long-term tax liabilities decreased by $236 million for the year ended December 31, 2014. In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities”. The new standard principally affects accounting standards for equity investments, financial liabilities where the fair value option has been elected, and the presentation and disclosure requirements for financial instruments. Upon the effective date of the new standards, all equity investments in unconsolidated entities, other than those accounted for using the equity method of accounting, will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification and therefore, no changes in fair value will be reported in other comprehensive income for equity securities with readily determinable fair values. The new guidance on the classification and measurement will be effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and early adoption is permitted. The Company is in the process of evaluating the impact of the adoption of ASU 2016-01 on the consolidated financial statements and currently anticipates the new guidance would significantly impact its Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income as the Company’s marketable equity securities, due primarily to Alibaba Group and Hortonworks, are currently classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income. In February 2016, the FASB issued ASU 2016-02, “Leases” which, for operating leases, requires a lessee to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The standard also requires a lessee to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term, on a generally straight-line basis. The ASU is effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the effects that the adoption of ASU 2016-02 will have on the Company’s consolidated financial statements and anticipates the new guidance will significantly impact its consolidated financial statements given the Company has a significant number of leases.

Marketable Securities Investm32

Marketable Securities Investments And Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Available for Sale Securities	The following tables summarize the available-for-sale securities (in thousands): December 31, 2014 Cost Gross Gross Estimated 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 December 31, 2015 Cost Gross Gross Estimated Government and agency securities $ 616,501 $ 24 $ (635 ) $ 615,890 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 4,589,799 292 (4,908 ) 4,585,183 Alibaba Group equity securities 2,713,483 28,458,878 — 31,172,361 Hortonworks equity securities 26,246 57,977 — 84,223 Other corporate equity securities 298 — (101 ) 197 Total available-for-sale marketable securities $ 7,946,327 $ 28,517,171 $ (5,644 ) $ 36,457,854
Schedule of Available for Sale Marketable Securities by Balance Sheet Location	December 31, 2014 2015 Reported as: Short-term marketable securities $ 5,327,412 $ 4,225,112 Long-term marketable securities 2,230,892 975,961 Investment in Alibaba Group 39,867,789 31,172,361 Other long-term assets and investments 104,029 84,420 Total $ 47,530,122 $ 36,457,854
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 2015 Due within one year $ 5,327,412 $ 4,225,112 Due after one year through five years 2,230,892 975,961 Total available-for-sale marketable debt securities $ 7,558,304 $ 5,201,073
Available for Sale Marketable Securities in Unrealized Loss Position	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 Fair Unrealized Fair Value Unrealized 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 ) December 31, 2015 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Unrealized Fair Value Unrealized Government and agency securities $ 552,041 $ (635 ) $ — $ — $ 552,041 $ (635 ) Corporate debt securities, commercial paper, and bank certificates of deposit 2,415,347 (4,763 ) 99,214 (145 ) 2,514,561 (4,908 ) Total available-for-sale marketable debt securities $ 2,967,388 $ (5,398 ) $ 99,214 $ (145 ) $ 3,066,602 $ (5,543 )
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 (2) 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 December 31, 2015 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 386,792 $ — $ — $ 386,792 Available-for-sale marketable debt securities: Government and agency securities (1) — 635,917 — 635,917 Commercial paper and bank certificates of deposit (1) — 1,844,494 — 1,844,494 Corporate debt securities (1) — 2,918,496 — 2,918,496 Time deposits (1) — 82,703 — 82,703 Available-for-sale equity securities: — — — Other corporate equity securities (2) 197 — — 197 Alibaba Group equity securities 31,172,361 — — 31,172,361 Hortonworks equity securities (2) 84,223 — — 84,223 Hortonworks warrants — — 78,861 78,861 Foreign currency derivative contracts (3) — 84,319 — 84,319 Financial assets at fair value $ 31,643,573 $ 5,565,929 $ 78,861 $ 37,288,363 Liabilities Foreign currency derivative contracts (3) — (5,661 ) — (5,661 ) Total financial assets and liabilities at fair value $ 31,643,573 $ 5,560,268 $ 78,861 $ 37,282,702 (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 consolidated balance sheets. (2) The Hortonworks equity securities and other corporate equity securities are classified as part of other long-term assets and investments on the consolidated balance sheets. (3) Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the 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 $1.5 billion, including contracts designated as net investment hedges of $1.2 billion, as of December 31, 2015.
Warrant
Assumptions Used to Calculate Value of Warrants	The Company determined the estimated fair value of the warrants using the Black-Scholes model with the following assumptions: Preferred warrants Common warrants Years Ended December 31, Years Ended December 31, 2014 2015 2014 2015 Expected dividend yield 0 % 0 % 0 % 0 % Risk-free interest rate 1.71 % 1.78 % 2.20 % 2.25 % Expected volatility 46.0 % 46.0 % 46.0 % 46.0 % Expected life (in years) 5.50 4.50 8.44 7.44

Consolidated Financial Statem33

Consolidated Financial Statement Details (Tables)	12 Months Ended
	Dec. 31, 2015
Prepaid Expenses and Other Current Assets	As of December 31, prepaid expenses and other current assets consisted of the following (in thousands): 2014 2015 Prepaid expenses $ 132,306 $ 87,843 Foreign currency forward and option contract assets 122,648 84,136 Other receivables non-trade 85,893 167,198 Restricted cash (*) 23,088 29,678 Income tax receivables 44,998 220,996 Other 11,274 12,941 Total prepaid expenses and other current assets $ 420,207 $ 602,792 (*) The amount represents customer funds received by the Company in connection with its online e-commerce services in the Asia Pacific region that are restricted in a separate bank account.
Property and Equipment, Net	As of December 31, property and equipment, net consisted of the following (in thousands): 2014 2015 Land $ 215,740 $ 215,740 Buildings 780,688 840,083 Leasehold improvements (*) 210,876 252,985 Computers and equipment (*) 1,839,033 2,143,413 Capitalized software and labor 658,762 643,758 Furniture and fixtures 74,992 86,418 Assets not yet in use 125,555 83,164 3,905,646 4,265,561 Less: accumulated depreciation and amortization (*) (2,417,962 ) (2,718,238 ) Total property and equipment, net $ 1,487,684 $ 1,547,323 (*) The Company recorded assets under capital leases, primarily for computers and equipment and leasehold improvements, which had gross carrying values of $76 million and $82 million as of December 31, 2014 and December 31, 2015, respectively. Accumulated amortization related to these capital leases totaled $66 million and $75 million as of December 31, 2014 and December 31, 2015, respectively.
Other Long-Term Assets and Investments	As of December 31, other long-term assets and investments consisted of the following (in thousands): 2014 2015 Deferred income taxes $ 35,123 $ 21,745 Investments in privately-held companies 82,354 82,610 Hortonworks equity securities and warrants 202,091 163,084 Foreign currency forward and option contracts 80,280 183 Restricted cash (*) 3,818 — Other 159,894 74,768 Total other long-term assets and investments $ 563,560 $ 342,390 (*) The amount represents letters of credit secured with cash.
Other Accrued Expenses and Current Liabilities	As of December 31, other accrued expenses and current liabilities consisted of the following (in thousands): 2014 2015 Accrued content, connection, traffic acquisition, and other costs $ 172,913 $ 252,612 Accrued compensation and related expenses 373,749 310,111 Income taxes payable ( ) (264,993 ) 4,181 Accrued professional service expenses 49,651 40,914 Accrued sales and marketing related expenses 16,424 40,876 Accrued restructuring costs 47,356 40,283 Current liability for uncertain tax contingencies 2,179 12,586 Other 260,430 233,095 Total other accrued expenses and current liabilities $ 657,709 $ 934,658 (*) Income taxes payable reflect amounts owed to taxing authorities, net of tax payments and other credits resulting from current period deductions. The December 31, 2014 balance excludes the income taxes payable related to the sale of Alibaba Group ADSs which is separately presented on the consolidated balance sheet.
Deferred and Other Long-Term Tax Liabilities	As of December 31, deferred and other long-term tax liabilities consisted of the following (in thousands): 2014 2015 Deferred and other income tax liabilities (1) $ 15,952,744 $ 12,312,013 Long-term liability for uncertain tax contingencies (2) 1,119,725 1,155,178 Total deferred and other long-term tax contingencies $ 17,072,469 $ 13,467,191 Presented as: Deferred tax liabilities related to investment in Alibaba Group (1) $ 16,154,906 $ 12,611,867 Deferred and other long-term tax liabilities $ 917,563 $ 855,324 (1) Deferred and other income tax liabilities are presented on a net basis by jurisdiction. The balances as of December 31, 2014 and December 31, 2015 include the deferred tax liabilities related to investment in Alibaba Group. (2) Includes interest and penalties.
Accumulated Other Comprehensive Income	As of December 31, the components of accumulated other comprehensive income were as follows (in thousands): 2014 2015 Unrealized gains on available-for-sale securities, net of tax $ 22,084,960 $ 16,918,539 Unrealized gains (losses) on cash flow hedges, net of tax 1,856 482 Foreign currency translation, net of tax (67,188 ) (342,990 ) Accumulated other comprehensive income $ 22,019,628 $ 16,576,031
Noncontrolling Interests	As of December 31, noncontrolling interests were as follows (in thousands): 2014 2015 Beginning noncontrolling interests $ 55,688 $ 43,755 Distributions to noncontrolling interests (22,344 ) (15,847 ) Net income attributable to noncontrolling interests 10,411 7,975 Ending noncontrolling interests $ 43,755 $ 35,883
Other Income (Expesne), Net	Other income (expense), net for 2013, 2014, and 2015 were as follows (in thousands): Years Ended December 31, 2013 2014 2015 Interest, dividend, and investment income $ 57,544 $ 26,309 $ 34,383 Interest expense (14,319 ) (68,851 ) (71,865 ) Gain on sale of Alibaba Group ADSs — 10,319,437 — Gain (loss) on Hortonworks warrants — 98,062 (19,201 ) Foreign exchange losses (6,197 ) (14,687 ) (22,226 ) Other 6,329 9,169 3,127 Total other income (expense), net $ 43,357 $ 10,369,439 $ (75,782 )
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2013 were as follows (in thousands): Amount Affected Line Item in the Realized gains on cash flow hedges, net of tax $ (2,080 ) Revenue Realized gains on available-for-sale securities, net of tax (796 ) Other income (expense), net Total reclassifications for the period $ (2,876 ) Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2014 were as follows (in thousands): Amount Affected Line Item in the Realized gains on cash flow hedges, net of tax $ (5,259 ) Revenue Realized gains on available-for-sale securities, net of tax (2,218 ) Other income (expense), net Foreign currency translation adjustments (“CTA”): Disposal of a portion of the investment in Alibaba Group, net of $30 million in tax (50,301 ) Other income (expense), net Total reclassifications for the period $ (57,778 ) Reclassifications out of accumulated other comprehensive income for the period ended December 31, 2015 were as follows (in thousands): Amount Affected Line Item in the Realized losses on cash flow hedges, net of tax $ 4,421 Revenue Realized losses on available-for-sale securities, net of tax 174 Other income (expense), net Total reclassifications for the period $ 4,595

Acquisitions And Dispositions (

Acquisitions And Dispositions (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Significant Acquisitions	The following table summarizes acquisitions (including business combinations and asset acquisitions) completed during the three years ended December 31, 2015 (in millions): Purchase Goodwill Amortizable 2013 Tumblr $ 990 $ 749 $ 263 Other acquisitions $ 279 $ 170 $ 95 2014 Flurry $ 270 $ 194 $ 55 BrightRoll $ 581 $ 417 $ 113 Other acquisitions $ 66 $ 39 $ 18 2015 Polyvore $ 161 $ 131 $ 19 Other acquisition $ 23 $ 22 $ 5
Tumblr
Allocation of Purchase Price of Assets Acquired And Liabilities Assumed	The allocation of the purchase price of the assets acquired and liabilities assumed based on their fair values was as follows (in thousands): Cash and marketable securities acquired $ 16,587 Other tangible assets acquired 76,566 Amortizable intangible assets: Developed technology 23,700 Customer contracts and related relationships 182,400 Tradename 56,500 Goodwill 748,979 Total assets acquired 1,104,732 Liabilities assumed (114,521 ) Total $ 990,211
Flurry, Inc.
Allocation of Purchase Price of Assets Acquired And Liabilities Assumed	The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 12,139 Other tangible assets acquired 51,235 Amortizable intangible assets: Developed technology 7,100 Customer contracts and related relationships 47,600 Other 720 Goodwill 194,081 Total assets acquired 312,875 Liabilities assumed (43,205 ) Total $ 269,670
BrightRoll, Inc.
Allocation of Purchase Price of Assets Acquired And Liabilities Assumed	The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 41,899 Accounts receivable, net 99,330 Other tangible assets acquired 55,923 Amortizable intangible assets: Developed technology 19,400 Customer contracts and related relationships 85,600 Other 8,100 Goodwill 416,580 Total assets acquired 726,832 Liabilities assumed (145,667 ) Total $ 581,165
Polyvore, Inc.
Allocation of Purchase Price of Assets Acquired And Liabilities Assumed	The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash acquired $ 6,019 Other tangible assets acquired 12,057 Amortizable intangible assets: Developed technology 17,550 Tradename 1,150 Customer contracts and related relationships 225 Goodwill 131,084 Total assets acquired 168,085 Liabilities assumed (7,503 ) Total $ 160,582

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule Of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2015 were as follows (in thousands): Americas (1) EMEA (2) Asia Pacific (3) Total Net balance as of January 1, 2014 $ 3,802,334 $ 546,856 $ 330,458 $ 4,679,648 Acquisitions and related adjustments 522,156 110,857 (607 ) 632,406 Goodwill impairment charge — (79,135 ) (9,279 ) (88,414 ) Foreign currency translation adjustments (2,271 ) (46,109 ) (22,690 ) (71,070 ) Net balance as of December 31, 2014 $ 4,322,219 $ 532,469 $ 297,882 $ 5,152,570 Acquisitions and related adjustments 130,450 21,606 — 152,056 Goodwill impairment charge (3,929,576 ) (531,261 ) — (4,460,837 ) Foreign currency translation adjustments (4,207 ) (22,814 ) (8,654 ) (35,675 ) Net balance as of December 31, 2015 $ 518,886 $ — $ 289,228 $ 808,114 (1) Gross goodwill balances for the Americas segment were $3.8 billion as of January 1, 2014 and $4.4 billion as of December 31, 2015. The Americas segment includes accumulated impairment losses of $3.9 billion as of December 31, 2015. (2) Gross goodwill balances for the EMEA segment were $1.1 billion as of January 1, 2014 and $1.2 billion as of December 31, 2015. The EMEA segment includes accumulated impairment losses of $551 million as of January 1, 2014, and $1.2 billion as of December 31, 2015. (3) Gross goodwill balances for the Asia Pacific segment were $480 million as of January 1, 2014 and $448 million as of December 31, 2015. The Asia Pacific segment includes accumulated impairment losses of $150 million as of January 1, 2014 and $159 million as of December 31, 2015.

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2015
Intangible Assets, Net	The following table summarizes the Company’s intangible assets, net (in thousands): December 31, 2014 Gross Carrying Accumulated Net Customer, affiliate, and advertiser related relationships $ 369,914 $ (88,318 ) $ 281,596 Developed technology and patents 206,422 (83,748 ) 122,674 Tradenames, trademarks, and domain names 107,841 (41,269 ) 66,572 Total intangible assets, net $ 684,177 $ (213,335 ) $ 470,842 December 31, 2015 Gross Carrying Accumulated Net Customer, affiliate, and advertiser related relationships $ 355,568 $ (135,513 ) $ 220,055 Developed technology and patents 170,289 (83,380 ) 86,909 Tradenames, trademarks, and domain names 67,119 (26,814 ) 40,305 Total intangible assets, net $ 592,976 $ (245,707 ) $ 347,269 (*) Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million for the both years ended as of December 31, 2014 and 2015.

Basic And Diluted Net Income 37

Basic And Diluted Net Income (Loss) Attributable To Yahoo! Inc. Common Stockholders Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Computation of Basic and Diluted Net Income (Loss) Per Share	The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts): Years Ended December 31, 2013 2014 2015 Basic: Numerator: Net income (loss) attributable to Yahoo! Inc. $ 1,366,281 $ 7,521,731 $ (4,359,082 ) Less: Net income allocated to participating securities (28 ) (68 ) — Net income (loss) attributable to Yahoo! Inc. common stockholders—basic $ 1,366,253 $ 7,521,663 $ (4,359,082 ) Denominator: Weighted average common shares 1,052,705 987,819 939,141 Net income (loss) attributable to Yahoo! Inc. common stockholders per share—basic $ 1.30 $ 7.61 $ (4.64 ) Diluted: Numerator: Net income (loss) attributable to Yahoo! Inc. $ 1,366,281 $ 7,521,731 $ (4,359,082 ) Less: Net income allocated to participating securities (28 ) (67 ) — Less: Effect of dilutive securities issued by equity investees (16,656 ) (43,689 ) — Net income (loss) attributable to Yahoo! Inc. common stockholders—diluted $ 1,349,597 $ 7,477,975 $ (4,359,082 ) Denominator: Denominator for basic calculation 1,052,705 987,819 939,141 Weighted average effect of Yahoo! Inc. dilutive securities: Restricted stock units 14,097 12,365 — Stock options and employee stock purchase plan (*) 4,009 3,924 — Denominator for diluted calculation 1,070,811 1,004,108 939,141 Net income (loss) attributable to Yahoo! Inc. common stockholders per share—diluted $ 1.26 $ 7.45 $ (4.64 ) (*) At the beginning of the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees. See Note 14—“Employee Benefits” for additional information.

Investments In Equity Interes38

Investments In Equity Interests Accounted For Using The Equity Method Of Accounting (Tables)	12 Months Ended
	Dec. 31, 2015
Investments in Equity Interests Using Equity Method of Accounting	The following table summarizes the Company’s investments in equity interests using the equity method of accounting as of December 31, 2014 and 2015 (dollars in thousands): December 31, Percent December 31, Percent Yahoo Japan $ 2,482,660 35.5 % $ 2,496,657 35.5 % Other 6,918 20 % 6,572 20 % Total $ 2,489,578 $ 2,503,229
Yahoo Japan
Condensed Financial Information	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. Any other differences between U.S. GAAP and IFRS did not have any material impact on the Yahoo Japan summarized financial information presented below (in thousands): Twelve Months Ended September 30, 2013 2014 2015 Operating data: Revenue $ 4,296,522 $ 4,046,412 $ 3,769,410 Gross profit $ 3,577,001 $ 3,262,450 $ 2,983,880 Income from operations $ 2,150,644 $ 1,896,368 $ 1,609,403 Net income $ 1,365,443 $ 1,236,583 $ 1,092,657 Net income attributable to Yahoo Japan $ 1,355,457 $ 1,225,221 $ 1,092,048 September 30, 2014 2015 Balance sheet data: Current assets $ 6,095,559 $ 6,150,688 Long-term assets $ 1,973,946 $ 2,430,699 Current liabilities $ 1,948,540 $ 2,003,960 Long-term liabilities $ 35,418 $ 245,834 Noncontrolling interests $ 66,998 $ 165,601

Foreign Currency Derivative F39

Foreign Currency Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Notional Amounts of Company's Outstanding Derivative Contracts	Notional amounts of the Company’s outstanding derivative contracts as of December 31, 2013, 2014 and 2015 (in millions) were as follows: December 31, 2013 2014 2015 Derivatives designated as hedging instruments: Net investment hedge forward and option contracts $ 1,341 $ 1,647 $ 1,150 Cash flow hedge forwards $ 56 $ 222 $ 75 Derivatives not designated as hedging instruments: Balance sheet hedges $ 393 $ 243 $ 225
Foreign Currency Derivative Activity	Foreign currency derivative activity for the year ended December 31, 2014 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 209 $ (234 ) $ — $ 210 (*) $ — $ 185 Cash flow hedges $ 4 $ (4 ) $ (1 ) $ 1 $ 8 $ 8 Derivatives not designated as hedging instruments: Balance sheet hedges $ — $ (12 ) $ 16 $ — $ — $ 4 (*) This amount does not reflect the tax impact of $79 million recorded during the twelve months ended December 31, 2014. The $131 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company’s consolidated balance sheets as of December 31, 2014. Foreign currency derivative activity for the year ended December 31, 2015 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 185 $ (117 ) $ 1 $ 5 (*) $ — $ 74 Cash flow hedges $ 8 $ — $ (1 ) $ (2 ) $ (3 ) $ 2 Derivatives not designated as hedging instruments: Balance sheet hedges $ 4 $ (21 ) $ 19 $ — $ — $ 2 (*) This amount does not reflect the tax impact of $2 million recorded during the twelve months ended December 31, 2015. The $3 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company’s consolidated balance sheets as of December 31, 2015.
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 December 31, December 31, Derivatives designated as hedging instruments: Net investment hedges Asset (1) $ 190 $ 79 Liability (2) $ (5 ) $ (5 ) Cash flow hedges Asset (1) $ 8 $ 2 Liability (2) $ — $ — Derivatives not designated as hedging instruments: Balance sheet hedges Asset (1) $ 5 $ 3 Liability (2) $ (1 ) $ (1 ) (1) Included in prepaid expenses and other current assets or other long-term assets and investments on the consolidated balance sheets. (2) Included in accrued expenses and other current liabilities or other long-term liabilities on the consolidated balance sheets.

Convertible Notes (Tables)

Convertible Notes (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Notes	The Notes consist of the following (in thousands): December 31, December 31, Liability component: Principal $ 1,437,500 $ 1,437,500 Less: note discount (267,077 ) (204,015 ) Net carrying amount $ 1,170,423 $ 1,233,485 Equity component(*) $ 305,569 $ 305,569 (*) Recorded on the consolidated balance sheet 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): Years Ended December 31, 2013 2014 2015 Accretion of convertible note discount $ 4,846 $ 59,838 $ 63,061
Fair Value and Carrying Value of Notes	The estimated 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 (the carrying value excludes the equity component of the Notes classified in equity) were as follows (in thousands): December 31, 2014 December 31, 2015 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 1,175,240 $ 1,170,423 $ 1,250,124 $ 1,233,485

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Lease Commitments	A summary of gross and net lease commitments as of December 31, 2015 was as follows (in millions): Gross Operating Sublease Net Operating Years ending December 31, 2016 $ 121 $ (13 ) $ 108 2017 91 (11 ) 80 2018 63 (8 ) 55 2019 48 (6 ) 42 2020 35 (3 ) 32 Due after 5 years 104 (5 ) 99 Total gross and net lease commitments $ 462 $ (46 ) $ 416
Capital Lease Commitment	Capital Years ending December 31, 2016 $ 15 2017 10 2018 9 2019 5 2020 — Due after 5 years — Gross capital lease commitments $ 39 Less: interest 6 Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities $ 33

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Stock Based Compensation Activity	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 holdbacks by Yahoo of shares of Yahoo common stock issued to founders of acquired companies in connection with certain of the Company’s acquisitions) are collectively referred to as the “Plans”. Stock option activity under the Company’s Plans for the year ended December 31, 2015 is summarized as follows (in thousands, except years and per share amounts): Shares Weighted Weighted Aggregate Outstanding at December 31, 2014 (1) 9,225 $ 18.57 4.33 $ 274,072 Options granted — $ — Options assumed in acquisitions 407 $ 11.89 Options exercised (2) (2,168 ) $ 16.23 Options expired (585 ) $ 19.09 Options cancelled/forfeited (357 ) $ 19.75 Outstanding at December 31, 2015 (1) 6,522 $ 18.82 4.03 $ 103,230 Vested and expected to vest, at December 31, 2015 (3) 6,338 $ 17.48 3.98 $ 100,310 Exercisable at December 31, 2015 3,925 $ 17.40 3.42 $ 62,553 (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. (3) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total outstanding options.
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, including assumed options from acquisitions, is determined using the Black-Scholes option pricing model with the following weighted average assumptions: Stock Options Purchase Plan (5) Years Ended December 31, Years Ended December 31, 2013 2014 2015 2013 2014 Expected dividend yield (1) 0 % 0 % 0 % 0 % 0 % Risk-free interest rate (2) 0.7 % 1.4 % 0.9 % 0.1 % 0 % Expected volatility (3) 33.3 % 34.5 % 34.5 % 31.7 % 36.8 % Expected life (in years) (4) 3.60 3.83 2.50 0.25 0.25 (1) The Company currently has no history or expectation of paying cash dividends on its common stock in the near future. (2) The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected term of the awards in effect at the time of grant. (3) The Company estimates the volatility of its common stock at the date of grant based on the implied volatility of publicly traded options on its common stock, with a term of one year or greater. (4) The expected life of stock options granted under the Plans is based on historical exercise patterns, which the Company believes are representative of future behavior. New grants issued by the Company had an expected life of 4 years in 2013 and 4 years in 2014. In 2015, the Company did not issue new stock options. Options assumed in acquisitions had expected lives of less than 3 years. (5) Assumptions for the Employee Stock Purchase Plan relate to the annual average of the enrollment periods. During the year ended December 31, 2012, enrollment was permitted in May and November of each year. Beginning in 2013, enrollment was permitted in February, May, August, and November of each year. During the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees.
Schedule of Restricted Stock and Restricted Stock Units Activity	Restricted Stock and Restricted Stock Units Shares Weighted Average Awarded and unvested at December 31, 2014 (1) 40,677 $ 32.38 Granted (2) 16,899 $ 41.53 Assumed in acquisitions — $ — Vested (16,969 ) $ 29.61 Forfeited (11,868 ) $ 32.99 Awarded and unvested at December 31, 2015 (1) 28,739 $ 39.15 (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 year ended December 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 year ended December 31, 2015.

Restructuring Charges, Net (Tab

Restructuring Charges, Net (Tables)	12 Months Ended
	Dec. 31, 2015
Restructuring Charges, Net	For the years ended December 31, 2013, 2014, and 2015, restructuring charges, net was comprised of the following (in thousands): Year Ended December 31, 2013 2014 2015 Employee severance pay and related costs $ 12,337 $ 30,749 $ 69,042 Non-cancelable lease, contract termination, and other charges 15,822 79,317 36,526 Reversals of previous charges (24,940 ) (3,222 ) (7,404 ) Non-cash accelerations of stock-based compensation expense — — 2,705 Other non-cash charges (credits), net 547 (3,394 ) 3,150 Restructuring charges, net $ 3,766 $ 103,450 $ 104,019
Restructuring Charges by Segment	For the years ended December 31, 2013, 2014, and 2015, restructuring charges, net consists of the following (in thousands): Year Ended December 31, 2013 2014 2015 Americas $ 571 $ 76,134 $ 68,637 EMEA 2,862 25,612 31,251 Asia Pacific 333 1,704 4,131 Restructuring charges, net $ 3,766 $ 103,450 $ 104,019
Restructuring Accrual Activity	The Company’s restructuring accrual activity for the years ended December 31, 2014 and 2015 is summarized as follows (in thousands): Total Accrual balance as of December 31, 2013 $ 30,096 Restructuring charges 103,450 Cash paid (52,301 ) Foreign currency translation and other adjustments 2,363 Accrual Balance as of December 31, 2014 $ 83,608 Restructuring charges 104,019 Cash paid (114,749 ) Non-cash accelerations of stock-based compensation expense (2,705 ) Foreign currency translation and other adjustments (4,282 ) Accrual Balance as of December 31, 2015 $ 65,891
Restructuring Accruals by Balance Sheet Classification	As of December 31, restructuring accruals were included on the Company’s consolidated balance sheets as follows (in thousands): 2014 2015 Accrued expenses and other current liabilities $ 47,356 $ 40,283 Other long-term liabilities 36,252 25,608 Total restructuring accruals $ 83,608 $ 65,891
Restructuring Accruals by Segment	As of December 31, restructuring accruals by segment consisted of the following (in thousands): 2014 2015 Americas $ 65,949 $ 47,054 EMEA 16,797 18,389 Asia Pacific 862 448 Total restructuring accruals $ 83,608 $ 65,891

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule Of Components Of Income (Loss) Before Income Taxes And Earnings In Equity Interests	The components of income (loss) before income taxes and earnings in equity interests are as follows (in thousands): Years Ended December 31, 2013 2014 2015 United States $ 538,824 $ 10,572,290 $ (4,394,462 ) Foreign 94,459 (59,909 ) (429,814 ) Income (loss) before income taxes and earnings in equity interests $ 633,283 $ 10,512,381 $ (4,824,276 )
Schedule Of Provision (Benefit) For Income Taxes	The provision (benefit) for income taxes is composed of the following (in thousands): Years Ended December 31, 2013 2014 2015 Current: United States federal $ 138,032 $ 3,067,395 $ (89,498 ) State 49,872 454,261 9,426 Foreign 49,790 50,573 32,815 Total current provision (benefit) for income taxes $ 237,694 $ 3,572,229 $ (47,257 ) Deferred: United States federal (63,166 ) 348,887 (20,507 ) State (22,498 ) 120,938 (31,374 ) Foreign 1,362 (3,952 ) 9,540 Total deferred provision (benefit) for income taxes $ (84,302 ) $ 465,873 $ (42,341 ) Provision (benefit) for income taxes $ 153,392 $ 4,038,102 $ (89,598 )
Schedule Of Effective Income Tax Rate Reconciliation	The provision (benefit) for income taxes differs from the amount computed by applying the federal statutory income tax rate to income before income taxes and earnings in equity interests as follows (in thousands): Years Ended December 31, 2013 2014 2015 Income tax at the U.S. federal statutory rate of 35 percent $ 221,648 $ 3,679,333 $ (1,688,496 ) State income taxes, net of federal benefit 23,000 400,824 (7,912 ) Stock-based compensation expense 16,015 8,132 9,508 Research tax credits (18,036 ) (23,775 ) (15,659 ) Effect of non-U.S. operations (47,968 ) (53,079 ) 165,203 Settlement with tax authorities (46,943 ) (24,870 ) (1,981 ) Remeasurement of prior year tax positions (24,246 ) — (5,286 ) Acquisition related non-deductible expenses 9,296 16,881 15,970 Tax liquidation of acquired entities — — (56,170 ) Goodwill impairment charge 22,244 30,945 1,486,792 Intangible Impairment — — 2,468 Other (1,618 ) 3,711 5,965 Provision (benefit) for income taxes $ 153,392 $ 4,038,102 $ (89,598 )
Schedule Of Deferred Tax Assets And Liabilities	Deferred income taxes reflect the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of deferred income tax assets and liabilities are as follows (in thousands): December 31, 2014 2015 Deferred income tax assets: Net operating loss and tax credit carryforwards $ 156,385 $ 185,425 Stock-based compensation expense 55,951 34,644 Non-deductible accrued expenses 118,457 114,519 Deferred revenue 90,023 10,153 Fixed assets 18,059 14,096 Federal benefits relating to tax positions 320,185 308,347 Other 8,104 8,580 Gross deferred income tax assets 767,164 675,764 Valuation allowance (23,853 ) (29,001 ) Deferred income tax assets $ 743,311 $ 646,763 Deferred income tax liabilities: Purchased intangible assets $ (200,569 ) $ (86,905 ) Fixed assets (174,196 ) (146,234 ) Alibaba unrealized gains (16,154,906 ) (12,611,867 ) Unrealized income in investments (75,368 ) (85,761 ) Restructuring liabilities (8,224 ) (4,046 ) Other (3,271 ) (2,216 ) Deferred income tax liabilities $ (16,616,534 ) $ (12,937,029 ) Net deferred income tax liabilities $ (15,873,223 ) $ (12,290,266 )
Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits in 2013, 2014, and 2015 is as follows (in thousands): 2013 2014 2015 Unrecognized tax benefits balance at January 1 $ 727,367 $ 695,285 $ 1,023,626 Gross increase for tax positions of prior years 69,188 65,606 27,583 Gross decrease for tax positions of prior years (40,298 ) (9,954 ) (17,748 ) Gross increase for tax positions of current year 34,556 358,434 41,428 Settlements (94,640 ) (84,942 ) (4,700 ) Lapse of statute of limitations (888 ) (803 ) (3,080 ) Unrecognized tax benefits balance at December 31 $ 695,285 $ 1,023,626 $ 1,067,109
Summary Of Remaining Balances Of Unrecognized Tax Benefits	The remaining balances are recorded on the Company’s consolidated balance sheets as follows (in thousands): December 31, 2014 2015 Total unrecognized tax benefits balance $ 1,023,626 $ 1,067,109 Amounts netted against related deferred tax assets (53,500 ) (64,601 ) Unrecognized tax benefits recorded on consolidated balance sheets $ 970,126 $ 1,002,508 Amounts classified as accrued expenses and other current liabilities $ 2,179 $ 12,586 Amounts classified as deferred and other long-term tax liabilities, net 967,947 989,922 Unrecognized tax benefits recorded on consolidated balance sheets $ 970,126 $ 1,002,508

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Information	The following tables present summarized information by segment (in thousands): Years Ended December 31, 2013 2014 2015 Revenue by segment: Americas $ 3,481,502 $ 3,517,861 $ 3,976,770 EMEA 385,186 374,833 343,646 Asia Pacific 813,692 725,439 647,885 Total Revenue 4,680,380 4,618,133 4,968,301 TAC by segment: Americas 158,974 166,545 788,725 EMEA 42,915 36,867 57,284 Asia Pacific 52,553 14,119 31,505 Total TAC 254,442 217,531 877,514 Revenue ex-TAC by segment: Americas 3,322,528 3,351,316 3,188,045 EMEA 342,271 337,966 286,362 Asia Pacific 761,139 711,320 616,380 Total Revenue ex-TAC 4,425,938 4,400,602 4,090,787 Direct costs by segment (1) Americas 256,945 283,594 319,744 EMEA 89,478 87,490 95,789 Asia Pacific 196,832 198,910 196,054 Global operating costs (2)(3) 2,398,388 2,566,954 2,547,368 Gains on sales of patents (79,950 ) (97,894 ) (11,100 ) Asset impairment charge — — 44,381 Goodwill impairment charge 63,555 88,414 4,460,837 Intangibles impairment charge — — 15,423 Restructuring charges, net 3,766 103,450 104,019 Depreciation and amortization 628,778 606,568 609,613 Stock-based compensation expense 278,220 420,174 457,153 Income (loss) from operations $ 589,926 $ 142,942 $ (4,748,494 ) (1) Direct costs for each segment include costs associated with the local sales teams and other cost of revenue. (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. (3) The net cost reimbursements from Microsoft pursuant to the Search Agreement are primarily included in global operating costs. Operating costs and expenses consist of cost of revenue-TAC; cost of revenue-other; sales and marketing, product development; general and administrative; amortization of intangible assets; and restructuring charges, net. Cost of revenue-other consists of bandwidth costs and other expenses associated with the production and usage of Yahoo Properties, including content expense and amortization of acquired intellectual property rights and developed technology.
Capital Expenditures by Segment	Years Ended December 31, 2013 2014 2015 Capital expenditures, net: Americas $ 309,215 $ 357,512 $ 490,780 EMEA 11,435 20,034 25,479 Asia Pacific 17,481 18,069 26,728 Total capital expenditures, net $ 338,131 $ 395,615 $ 542,987
Property and Equipment, Net by Segment	December 31, 2014 2015 Property and equipment, net: Americas: U.S. $ 1,382,597 $ 1,447,995 Other 787 353 Total Americas $ 1,383,384 $ 1,448,348 EMEA 34,649 33,940 Asia Pacific 69,651 65,035 Total property and equipment, net $ 1,487,684 $ 1,547,323
Enterprise Wide Disclosures Revenues for Groups of Similar Services	The following table presents revenue for groups of similar services (in thousands): Years Ended December 31, 2013 2014 2015 Search $ 1,741,791 $ 1,792,861 $ 2,084,139 Display 1,949,830 1,868,035 2,074,161 Other 988,759 957,237 810,001 Total revenue $ 4,680,380 $ 4,618,133 $ 4,968,301 Years Ended December 31, 2013 2014 2015 Revenue: U.S. $ 3,317,794 $ 3,380,310 $ 3,865,772 International 1,362,586 1,237,823 1,102,529 Total revenue $ 4,680,380 $ 4,618,133 $ 4,968,301

Selected Quarterly Financial 46

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Selected Quarterly Financial Data	Selected Quarterly Financial Data (Unaudited) Quarters Ended March 31, (1) June 30, (2) September 30, (3) December 31, (4) March 31, (5) June 30, (6) September 30, (7) December 31, (8) (In thousands, except per share amounts) Revenue $ 1,132,730 $ 1,084,191 $ 1,148,140 $ 1,253,072 $ 1,225,970 $ 1,243,265 $ 1,225,673 $ 1,273,393 Total operating expenses $ 1,102,551 $ 1,045,754 $ 1,105,968 $ 1,220,918 $ 1,313,324 $ 1,288,059 $ 1,311,985 $ 5,803,427 Income (loss) from operations $ 30,179 $ 38,437 $ 42,172 $ 32,154 $ (87,354 ) $ (44,794 ) $ (86,312 ) $ (4,530,034 ) Other income (expense), net $ (13,453 ) $ (13,589 ) $ 10,308,931 $ 87,550 $ (31,063 ) $ (11,741 ) $ (23,955 ) $ (9,023 ) (Provision) benefit for income taxes $ (4,217 ) $ (8,143 ) $ (3,973,402 ) $ (52,340 ) $ 40,900 $ (58,495 ) $ 93,208 $ 13,985 Earnings in equity interests $ 301,402 $ 255,852 $ 398,692 $ 101,917 $ 99,690 $ 95,841 $ 95,195 $ 92,845 Net income (loss) attributable to Yahoo! Inc. $ 311,578 $ 269,707 $ 6,774,102 $ 166,344 $ 21,198 $ (21,554 ) $ 76,261 $ (4,434,987 ) Net income (loss) attributable to Yahoo! Inc. common stockholders per share—basic $ 0.31 $ 0.27 $ 6.82 $ 0.18 $ 0.02 $ (0.02 ) $ 0.08 $ (4.70 ) Net income (loss) attributable to Yahoo! Inc. common stockholders per share—diluted $ 0.29 $ 0.26 $ 6.70 $ 0.17 $ 0.02 $ (0.02 ) $ 0.08 $ (4.70 ) Shares used in per share calculation— basic 1,009,890 999,765 993,543 948,079 934,748 937,569 940,822 943,425 Shares used in per share calculation— diluted 1,031,420 1,014,692 1,007,693 962,626 947,976 937,569 946,934 943,425 (1) Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million. (2) Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million. (3) Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million. (4) Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million. (5) Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million. (6) Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million. (7) Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million. (8) Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.

Company and Summary of Signific

Company and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Apr. 15, 2015	Feb. 23, 2015	Dec. 31, 2015USD ($)Customer	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)Customer	Dec. 31, 2014USD ($)Customer	Dec. 31, 2013USD ($)Customer
Organization and Summary of Significant Accounting Policies [Line Items]
Adjustments to previous purchase accounting estimates for acquisitions, tax and other adjustments				$ 11,000
Net cash provided by (used in) operating activities					$ (2,383,422)	$ 916,350	$ 1,195,247
Net cash provided by (used in) investing activities					$ 1,752,112	$ 3,738,501	$ (23,221)
Number of other customers that accounted for more than 10% of revenue during the period | Customer					0	0	0
Number of customers that accounted for more than 10% of accounts receivable balance | Customer			0		0	0
Foreign currency translation loss					$ 22,226	$ 14,687	$ 6,197
Capitalized software and labor costs					31,000	85,000	130,000
Amortization of capitalized cost total					144,000	161,000	175,000
Capitalized amount of stock-based compensation					5,000	12,000	16,000
Asset impairment charge			$ 2,000		$ 44,381
Capital lease period maximum					15 years
Interest related to capital leases					$ 4,000	5,000	5,000
Net lease obligations			$ 33,000		33,000	47,000
Income taxes paid, net of refunds received					$ 3,000,000	90,000	208,000
Revenue share rate from Microsoft's services under the Search Agreement, to be received in first five years					88.00%
Revenue share rate	93.00%	90.00%
Microsoft revenue share rate before deduction of affiliate site's share of revenue	7.00%
Advertising expense total					$ 184,000	142,000	$ 128,000
Buildings
Organization and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life, years					25 years
Minimum
Organization and Summary of Significant Accounting Policies [Line Items]
Amortizable intangible assets, useful life, years					1 year
Vesting period, years					1 year
Minimum | Computer Equipment Furniture And Fixtures
Organization and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life, years					3 years
Maximum
Organization and Summary of Significant Accounting Policies [Line Items]
Amortizable intangible assets, useful life, years					7 years
Vesting period, years					4 years
Maximum | Computer Equipment Furniture And Fixtures
Organization and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life, years					5 years
Originally Developed Content
Organization and Summary of Significant Accounting Policies [Line Items]
Amortizable intangible assets, useful life, years					18 months
Asset impairment charge					$ 16,000
Acquired Content
Organization and Summary of Significant Accounting Policies [Line Items]
Asset impairment charge					$ 28,000
Capitalized Software And Labor | Minimum
Organization and Summary of Significant Accounting Policies [Line Items]
Amortizable intangible assets, useful life, years					1 year
Capitalized Software And Labor | Maximum
Organization and Summary of Significant Accounting Policies [Line Items]
Amortizable intangible assets, useful life, years					3 years
ASU 2015-17 | New Accounting Pronouncement, Early Adoption, Effect | Prepaid Expense And Other Assets Current
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						253,000
ASU 2015-17 | New Accounting Pronouncement, Early Adoption, Effect | Accrued Expenses and Other Current Liabilities
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						(8,000)
ASU 2015-17 | New Accounting Pronouncement, Early Adoption, Effect | Long Term Investments and Other Assets
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						(9,000)
ASU 2015-17 | New Accounting Pronouncement, Early Adoption, Effect | Deferred Income Taxes and Other Long-Term Liabilities
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						$ (236,000)
Customer Concentration Risk | Sales Revenue, Net | Search Agreement | Microsoft
Organization and Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage					35.00%	35.00%	31.00%
Reclassification Adjustment
Organization and Summary of Significant Accounting Policies [Line Items]
Net cash provided by (used in) operating activities						$ 23,000
Net cash provided by (used in) investing activities						(23,000)
Editorial costs | Cost of revenue - other
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						89,000	$ 0
Editorial costs | Sales and marketing
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						(89,000)	0
Facilities-related costs previously included in product development expense | General and administrative
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						51,000	51,000
Facilities-related costs previously included in product development expense | Product development
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						(51,000)	(51,000)
Facilities-related costs previously included in sales and marketing expense | Sales and marketing
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						(61,000)	(47,000)
Facilities-related costs previously included in sales and marketing expense | General and administrative
Organization and Summary of Significant Accounting Policies [Line Items]
Prior period reclassification adjustment						$ 61,000	$ 47,000

Available for Sale Securities (

Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 7,946,327	$ 10,302,355
Gross Unrealized Gains	28,517,171	37,233,212
Gross Unrealized Losses	(5,644)	(5,445)
Estimated Fair Value, Total available-for-sale marketable securities	36,457,854	47,530,122
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	616,501	850,712
Gross Unrealized Gains	24	82
Gross Unrealized Losses	(635)	(792)
Estimated Fair Value, Total available-for-sale marketable securities	615,890	850,002
Corporate Debt Securities, Commercial Paper, Time Deposits, And Bank Certificates Of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	4,589,799	6,711,683
Gross Unrealized Gains	292	612
Gross Unrealized Losses	(4,908)	(4,653)
Estimated Fair Value, Total available-for-sale marketable securities	4,585,183	6,707,642
Corporate Equity Securities | Alibaba Group
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	2,713,483	2,713,484
Gross Unrealized Gains	28,458,878	37,154,305
Estimated Fair Value, Total available-for-sale marketable securities	31,172,361	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	57,977	77,783
Estimated Fair Value, Total available-for-sale marketable securities	84,223	104,029
Corporate Equity Securities | Other corporate equity securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	298	230
Gross Unrealized Gains		430
Gross Unrealized Losses	(101)
Estimated Fair Value, Total available-for-sale marketable securities	$ 197	$ 660

Available for Sale Marketable S

Available for Sale Marketable Securities by Balance Sheet Location (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Short-term marketable securities	$ 4,225,112	$ 5,327,412
Long-term marketable securities	975,961	2,230,892
Investment in Alibaba Group	31,172,361	39,867,789
Other long-term assets and investments	84,420	104,029
Total	$ 36,457,854	$ 47,530,122

Marketable Securities Investm50

Marketable Securities Investments and Fair Value Disclosures - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments [Line Items]
Cash and cash equivalents				$ 1,631,911	$ 2,664,098	$ 2,077,590	$ 2,667,778
Cash deposited with commercial banks
Investments [Line Items]
Cash and cash equivalents				$ 965,000	712,000
Hortonworks, Inc
Investments [Line Items]
Percentage of ownership interest, before current transaction				16.00%
Cost method investment balance				$ 26,000
Number of unregistered shares owned				3,800
Unregistered shares lock-up agreement period				6 months
Available-for-sale securities				$ 84,223	104,029
Warrants				$ 79,000	98,000
Purchase entitlement of common stock upon exercise of warrants				3,700
Gain recorded following the initial public offering					57,000
Gain (Loss) in fair value of warrants	$ (13,000)	$ 5,000	$ (12,000)
Hortonworks, Inc | Other income (expense), net
Investments [Line Items]
Gain (Loss) in fair value of warrants				$ (19,000)	41,000
Other long-term assets and investments
Investments [Line Items]
Cost method investment balance				$ 83,000	82,000
Convertible Senior Notes
Investments [Line Items]
Principal amount						$ 1,437,500
Convertible senior notes percent				0.00%		0.00%
Maturity date, convertible senior note				Dec. 1, 2018
Preferred warrants | Hortonworks, Inc
Investments [Line Items]
Purchase entitlement of common stock upon exercise of warrants				3,250
Warrants held				6,500
Exercise price per share				$ 0.01
Common warrants | Hortonworks, Inc
Investments [Line Items]
Purchase entitlement of common stock upon exercise of warrants				500
Warrants held				500
Exercise price per share				$ 8.46
Cash and Cash Equivalents
Investments [Line Items]
Short-term investments				$ 667,000	2,000,000
Fair Value Measurements At Reporting Date Using Level 2 | Convertible Senior Notes
Investments [Line Items]
Fair value of the convertible senior notes				$ 1,250,124	$ 1,175,240

Available for Sale Securities b

Available for Sale Securities by Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Due within one year	$ 4,225,112	$ 5,327,412
Due after one year through five years	975,961	2,230,892
Total available-for-sale marketable debt securities	$ 5,201,073	$ 7,558,304

Available for Sale Marketable D

Available for Sale Marketable Debt Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 2,967,388	$ 3,346,236
Less than 12 Months, Unrealized Loss	(5,398)	(5,438)
12 Months or Longer, Fair Value	99,214	3,234
12 Months or Longer, Unrealized Loss	(145)	(7)
Total, Fair Value	3,066,602	3,349,470
Total, Unrealized Loss	(5,543)	(5,445)
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	552,041	744,948
Less than 12 Months, Unrealized Loss	(635)	(792)
Total, Fair Value	552,041	744,948
Total, Unrealized Loss	(635)	(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	2,415,347	2,601,288
Less than 12 Months, Unrealized Loss	(4,763)	(4,646)
12 Months or Longer, Fair Value	99,214	3,234
12 Months or Longer, Unrealized Loss	(145)	(7)
Total, Fair Value	2,514,561	2,604,522
Total, Unrealized Loss	$ (4,908)	$ (4,653)

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Hortonworks, Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 84,223	$ 104,029
Warrants		79,000	98,000
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		31,643,573	40,346,300
Total financial assets and liabilities at fair value		31,643,573	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	[1]	386,792	373,822
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	[2]	197	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		31,172,361	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	[2]	84,223	104,029
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		5,565,929	9,343,433
Total financial assets and liabilities at fair value		5,560,268	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	[1]	635,917	850,002
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]	1,844,494	3,602,321
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	[1]	2,918,496	3,327,017
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	[1]	82,703	1,361,165
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	[3]	84,319	202,928
Foreign currency derivative contracts, liabilities	[3]	(5,661)	(6,157)
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		78,861	98,062
Total financial assets and liabilities at fair value		78,861	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		78,861	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		37,288,363	49,787,795
Total financial assets and liabilities at fair value		37,282,702	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		78,861	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	[1]	386,792	373,822
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	[1]	635,917	850,002
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]	1,844,494	3,602,321
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	[1]	2,918,496	3,327,017
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	[1]	82,703	1,361,165
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	[2]	197	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		31,172,361	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	[2]	84,223	104,029
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	[3]	84,319	202,928
Foreign currency derivative contracts, liabilities	[3]	$ (5,661)	$ (6,157)
[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 consolidated balance sheets.
[2]	The Hortonworks equity securities and other corporate equity securities are classified as part of other long-term assets and investments on the consolidated balance sheets.
[3]	Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the 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 $1.5 billion, including contracts designated as net investment hedges of $1.2 billion, as of December 31, 2015.

Fair Value of Financial Asset54

Fair Value of Financial Assets and Liabilities (Parenthetical) (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative notional amount	$ 1,500	$ 2,100
Designated as Hedging Instrument | Net Investment Hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative notional amount	$ 1,150	$ 1,647	$ 1,341

Assumptions Used to Calculate V

Assumptions Used to Calculate Value of Warrants (Detail) - Hortonworks, Inc	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Preferred warrants
Investments [Line Items]
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	1.78%	1.71%
Expected volatility	46.00%	46.00%
Expected life (in years)	4 years 6 months	5 years 6 months
Common warrants
Investments [Line Items]
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	2.25%	2.20%
Expected volatility	46.00%	46.00%
Expected life (in years)	7 years 5 months 9 days	8 years 5 months 9 days

Consolidated Financial Statem56

Consolidated Financial Statement Details (Prepaid Expenses And Other Current Assets) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Prepaid And Other Current Assets [Line Items]
Prepaid expenses		$ 87,843	$ 132,306
Foreign currency forward and option contract assets		84,136	122,648
Other receivables non-trade		167,198	85,893
Restricted cash	[1]	29,678	23,088
Income tax receivables		220,996	44,998
Other		12,941	11,274
Total prepaid expenses and other current assets		$ 602,792	$ 420,207
[1]	The amount represents customer funds received by the Company in connection with its online e-commerce services in the Asia Pacific region that are restricted in a separate bank account.

Property and Equipment Net (Det

Property and Equipment Net (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		$ 4,265,561	$ 3,905,646
Less: accumulated depreciation and amortization	[1]	(2,718,238)	(2,417,962)
Total property and equipment, net		1,547,323	1,487,684
Land
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		215,740	215,740
Buildings
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		840,083	780,688
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross	[1]	252,985	210,876
Computers and Equipment
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross	[1]	2,143,413	1,839,033
Capitalized Software And Labor
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		643,758	658,762
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		86,418	74,992
Assets not yet in use
Property, Plant and Equipment [Line Items]
Property Plant and Equipment Gross		$ 83,164	$ 125,555
[1]	The Company recorded assets under capital leases, primarily for computers and equipment and leasehold improvements, which had gross carrying values of $76 million and $82 million as of December 31, 2014 and December 31, 2015, respectively. Accumulated amortization related to these capital leases totaled $66 million and $75 million as of December 31, 2014 and December 31, 2015, respectively.

Property and Equipment Net (Par

Property and Equipment Net (Parenthetical) (Detail) - Computers and Equipment - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capital lease assets, gross	$ 82	$ 76
Capital leased assets, accumulated depreciation	$ 75	$ 66

Other Long-Term Assets and Inve

Other Long-Term Assets and Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Other Long Term Assets [Line Items]
Deferred income taxes	$ 21,745	$ 35,123
Foreign currency forward and option contracts	183	80,280
Restricted cash	0	3,818	[1]
Other	74,768	159,894
Total other long-term assets and investments	342,390	563,560
Investments in privately-held companies
Schedule of Other Long Term Assets [Line Items]
Investments	82,610	82,354
Hortonworks, Inc | Equity Securities and Warrants
Schedule of Other Long Term Assets [Line Items]
Investments	$ 163,084	$ 202,091
[1]	The amount represents letters of credit secured with cash.

Other Accrued Expenses and Curr

Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Accrued Expenses and Other Current Liabilities [Line Items]
Accrued content, connection, traffic acquisition, and other costs		$ 252,612	$ 172,913
Accrued compensation and related expenses		310,111	373,749
Income taxes payable	[1]	4,181	(264,993)
Accrued professional service expenses		40,914	49,651
Accrued sales and marketing related expenses		40,876	16,424
Accrued restructuring costs		40,283	47,356
Current liability for uncertain tax contingencies		12,586	2,179
Other		233,095	260,430
Total other accrued expenses and current liabilities		$ 934,658	$ 657,709
[1]	Income taxes payable reflect amounts owed to taxing authorities, net of tax payments and other credits resulting from current period deductions. The December 31, 2014 balance excludes the income taxes payable related to the sale of Alibaba Group ADSs which is separately presented on the consolidated balance sheet.

Deferred and Other Long-Term Ta

Deferred and Other Long-Term Tax Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Deferred and Other Long Term Liabilities Net [Line Items]
Deferred and other income tax liabilities	[1]	$ 12,312,013	$ 15,952,744
Long-term liability for uncertain tax contingencies	[2]	1,155,178	1,119,725
Total deferred and other long-term tax contingencies		13,467,191	17,072,469
Deferred tax liabilities related to investment in Alibaba Group	[1]	12,611,867	16,154,906
Deferred and other long-term tax liabilities		$ 855,324	$ 917,563
[1]	Deferred and other income tax liabilities are presented on a net basis by jurisdiction. The balances as of December 31, 2014 and December 31, 2015 include the deferred tax liabilities related to investment in Alibaba Group.
[2]	Includes interest and penalties.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains on available-for-sale securities, net of tax	$ 16,918,539	$ 22,084,960
Unrealized gains (losses) on cash flow hedges, net of tax	482	1,856
Foreign currency translation, net of tax	(342,990)	(67,188)
Accumulated other comprehensive income	$ 16,576,031	$ 22,019,628

Noncontrolling Interests (Detai

Noncontrolling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Beginning noncontrolling interests	$ 43,755	$ 55,688
Distributions to noncontrolling interests	(15,847)	(22,344)
Net income attributable to noncontrolling interests	7,975	10,411	$ 10,285
Ending noncontrolling interests	$ 35,883	$ 43,755	$ 55,688

Other Income (expense), Net (De

Other Income (expense), Net (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

[1]

Sep. 30, 2015

[2]

Jun. 30, 2015

[3]

Mar. 31, 2015

[4]

Dec. 31, 2014

Sep. 30, 2014

[6]

Jun. 30, 2014

[7]

Mar. 31, 2014

[8]

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Components of Other Income (Expense) [Line Items]

Interest, dividend, and investment income

$ 34,383

$ 26,309

$ 57,544

Interest expense

(71,865)

(68,851)

(14,319)

Gain on sale of Alibaba Group ADSs

10,319,437

Gain (loss) on Hortonworks warrants

$ 98,000

(19,199)

98,062

Foreign exchange losses

(22,226)

(14,687)

(6,197)

Other

3,127

9,169

6,329

Total other income (expense), net

$ (9,023)

$ (23,955)

$ (11,741)

$ (31,063)

$ 87,550

[5]

$ 10,308,931

$ (13,589)

$ (13,453)

$ (75,782)

$ 10,369,439

$ 43,357

[1]

Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.

[2]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.

[3]

Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.

[4]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.

[5]

Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.

[6]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.

[7]

Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.

[8]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Consolidated Financial Statem65

Consolidated Financial Statement Details - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	Sep. 24, 2014	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Hortonworks, Inc
Financial Statement Details [Line Items]
Gain recorded following the initial public offering						$ 57
Gain (Loss) in fair value of warrants		$ (13)	$ 5	$ (12)
Other income (expense), net | Hortonworks, Inc
Financial Statement Details [Line Items]
Gain (Loss) in fair value of warrants					$ (19)	$ 41
Alibaba Group
Financial Statement Details [Line Items]
Number of ADSs sold at initial public offering	140

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014	[5]	Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ (1,273,393)		$ (1,225,673)		$ (1,243,265)		$ (1,225,970)		$ (1,253,072)		$ (1,148,140)		$ (1,084,191)		$ (1,132,730)		$ (4,968,301)	$ (4,618,133)	$ (4,680,380)
Other income (expense), net	9,023		23,955		11,741		31,063		(87,550)		(10,308,931)		13,589		13,453		75,782	(10,369,439)	(43,357)
Net income attributable to Yahoo! Inc.	$ 4,434,987		$ (76,261)		$ 21,554		$ (21,198)		$ (166,344)		$ (6,774,102)		$ (269,707)		$ (311,578)		4,359,082	(7,521,731)	(1,366,281)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Yahoo! Inc.																	4,595	(57,778)	(2,876)
Reclassification out of Accumulated Other Comprehensive Income | Realized (gains) losses on cash flow hedges, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue																	4,421	(5,259)	(2,080)
Reclassification out of Accumulated Other Comprehensive Income | Realized (gains) losses on available-for-sale securities, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net																	$ 174	(2,218)	$ (796)
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net																		$ (50,301)
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Reclassifications Out of Accu67

Reclassifications Out of Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

[1]

Sep. 30, 2015

[2]

Jun. 30, 2015

[3]

Mar. 31, 2015

[4]

Dec. 31, 2014

[5]

Sep. 30, 2014

[6]

Jun. 30, 2014

[7]

Mar. 31, 2014

[8]

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

(Provision) benefit for income taxes

$ (13,985)

$ (93,208)

$ 58,495

$ (40,900)

$ 52,340

$ 3,973,402

$ 8,143

$ 4,217

$ (89,598)

$ 4,038,102

$ 153,392

Foreign currency translation adjustments | Reclassification out of Accumulated Other Comprehensive Income

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

(Provision) benefit for income taxes

$ 30,000

[1]

Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.

[2]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.

[3]

Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.

[4]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.

[5]

Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.

[6]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.

[7]

Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.

[8]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Summary of Significant Acquisit

Summary of Significant Acquisitions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 02, 2015	Dec. 12, 2014	Aug. 25, 2014	Jun. 19, 2013
Business Acquisition [Line Items]
Goodwill	$ 808,114	$ 5,152,570	$ 4,679,648
Tumblr
Business Acquisition [Line Items]
Purchase Price			990,000
Goodwill	519,000		749,000				$ 748,979
Amortizable Intangibles			263,000
Other Acquisitions
Business Acquisition [Line Items]
Purchase Price	23,000	66,000	279,000
Goodwill	22,000	39,000	170,000
Amortizable Intangibles	5,000	18,000	$ 95,000
Flurry, Inc.
Business Acquisition [Line Items]
Purchase Price		270,000
Goodwill		194,000				$ 194,081
Amortizable Intangibles		55,000
BrightRoll, Inc.
Business Acquisition [Line Items]
Purchase Price		581,000
Goodwill		417,000			$ 416,580
Amortizable Intangibles		$ 113,000
Polyvore, Inc.
Business Acquisition [Line Items]
Purchase Price	161,000
Goodwill	131,000			$ 131,084
Amortizable Intangibles	$ 19,000

Acquisitions and Dispositions -

Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands	Sep. 02, 2015USD ($)	Dec. 12, 2014USD ($)	Aug. 25, 2014USD ($)	Jun. 19, 2013USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)	Dec. 31, 2015USD ($)Entity	Dec. 31, 2014USD ($)Entity	Dec. 31, 2013USD ($)Entity
Business Acquisition [Line Items]
Stock-based compensation expense									$ 457,153	$ 420,174	$ 278,220
Goodwill							$ 5,152,570		808,114	5,152,570	4,679,648
Business combination, cash consideration paid net of cash acquired									175,693	859,036	1,247,544
Total cash consideration										460,000
Gain on sale of patents					$ 9,000	$ 2,000	35,000	$ 62,000	11,100	97,894	79,950
Proceeds from the sale of patents									29,100	86,300	79,950
Sale of Patents
Business Acquisition [Line Items]
Total cash consideration										61,000
Gain on sale of patents										61,000
Existing Patents
Business Acquisition [Line Items]
Total cash consideration										$ 135,000
Future revenue recognition period										4 years
Capture Period Patents
Business Acquisition [Line Items]
Total cash consideration										$ 264,000
Future revenue recognition period										5 years
Existing Patents and Capture Period Patents
Business Acquisition [Line Items]
Revenue related to patents									86,000	$ 43,000
Patents | Alibaba Group
Business Acquisition [Line Items]
Proceeds from the sale of patents										23,500	70,000
Patents | Yahoo Japan
Business Acquisition [Line Items]
Gain on sale of patents										12,000
Proceeds from the sale of patents										18,000
Sold Patents
Business Acquisition [Line Items]
Gain on sale of patents									$ 11,000
Maximum
Business Acquisition [Line Items]
Equity award vesting period									4 years
Amortizable intangible assets, useful life									7 years
Tumblr
Business Acquisition [Line Items]
Business combination, total purchase price				$ 990,211
Stock-based compensation expense				$ 70,000
Equity award vesting period				4 years
Contingent cash compensation to be paid to founder				$ 40,000
Contingent cash consideration, payment period				4 years
Weighted average useful life of amortizable intangible assets				6 years
Goodwill				$ 748,979					$ 519,000		749,000
Business combination, amortizable intangible assets											263,000
Business combination, other tangible assets				76,566
Business combination, assumed liabilities				114,521
Business combination, total purchase price											990,000
Tumblr | Common stock
Business Acquisition [Line Items]
Stock based compensation contingently issuable				$ 41,000
Tumblr | Maximum
Business Acquisition [Line Items]
Amortizable intangible assets, useful life				6 years
Tumblr | Unvested Stock Options and Restricted Stock Units
Business Acquisition [Line Items]
Stock based compensation contingently issuable				$ 29,000
Flurry, Inc.
Business Acquisition [Line Items]
Business combination, total purchase price			$ 269,670
Weighted average useful life of amortizable intangible assets			5 years
Goodwill			$ 194,081				194,000			194,000
Business combination, amortizable intangible assets							55,000			55,000
Business combination, other tangible assets			51,235
Business combination, cash acquired			12,139
Business combination, assumed liabilities			$ 43,205
Business combination, total purchase price										270,000
Flurry, Inc. | Maximum
Business Acquisition [Line Items]
Amortizable intangible assets, useful life			5 years
Flurry, Inc. | Stock Options
Business Acquisition [Line Items]
Stock-based compensation expense			$ 4,000
Equity award vesting period			4 years
Flurry, Inc. | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Stock-based compensation expense			$ 23,000
Equity award vesting period			4 years
BrightRoll, Inc.
Business Acquisition [Line Items]
Business combination, total purchase price		$ 581,165
Weighted average useful life of amortizable intangible assets		5 years
Goodwill		$ 416,580					417,000			417,000
Business combination, amortizable intangible assets							113,000			113,000
Business combination, other tangible assets		55,923
Business combination, cash acquired		41,899
Business combination, assumed liabilities		$ 145,667
Business combination, total purchase price										581,000
BrightRoll, Inc. | Maximum
Business Acquisition [Line Items]
Amortizable intangible assets, useful life		7 years
BrightRoll, Inc. | Stock Options
Business Acquisition [Line Items]
Stock-based compensation expense		$ 25,000
Equity award vesting period		4 years
BrightRoll, Inc. | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Stock-based compensation expense		$ 78,000
Equity award vesting period		4 years
Contingent cash compensation to be paid to founder		$ 54,000
Contingent cash consideration, payment period		3 years
Polyvore, Inc.
Business Acquisition [Line Items]
Business combination, total purchase price	$ 160,582
Stock-based compensation expense	$ 15,000
Equity award vesting period	4 years
Stock based compensation contingently issuable	$ 15,000
Weighted average useful life of amortizable intangible assets	3 years
Goodwill	$ 131,084								131,000
Business combination, amortizable intangible assets									19,000
Business combination, other tangible assets	12,057
Business combination, cash acquired	6,019
Business combination, assumed liabilities	$ 7,503
Business combination, total purchase price									161,000
Polyvore, Inc. | Maximum
Business Acquisition [Line Items]
Amortizable intangible assets, useful life	5 years
Polyvore, Inc. | Stock Options
Business Acquisition [Line Items]
Stock-based compensation expense	$ 7,000
Equity award vesting period	4 years
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, total purchase price							66,000			66,000	279,000
Goodwill							39,000		$ 22,000	$ 39,000	$ 170,000
Business combination, number of entities acquired | Entity									1	9	25
Business combination, cash consideration paid											$ 279,000
Business combination, cash acquired										$ 4,000	2,000
Business combination, cash consideration paid net of cash acquired										62,000	277,000
Business combination, amortizable intangible assets							18,000		$ 5,000	18,000	95,000
Business combination, other tangible assets							10,000			10,000	44,000
Business combination, cash acquired							4,000			4,000	2,000
Business combination, assumed liabilities							$ 5,000		4,000	$ 5,000	$ 34,000
Business combination, total purchase price									$ 23,000

Allocation of Purchase Price of

Allocation of Purchase Price of Assets Acquired and Liabilities Assumed, Tumblr (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 19, 2013
Business Acquisition [Line Items]
Goodwill	$ 808,114	$ 5,152,570	$ 4,679,648
Tumblr
Business Acquisition [Line Items]
Cash and marketable securities acquired				$ 16,587
Other tangible assets acquired				76,566
Amortizable intangible assets			263,000
Goodwill	$ 519,000		$ 749,000	748,979
Total assets acquired				1,104,732
Liabilities assumed				(114,521)
Total				990,211
Tumblr | Developed Technology
Business Acquisition [Line Items]
Amortizable intangible assets				23,700
Tumblr | Customer Contracts and Related Relationships
Business Acquisition [Line Items]
Amortizable intangible assets				182,400
Tumblr | Tradename
Business Acquisition [Line Items]
Amortizable intangible assets				$ 56,500

Allocation of Purchase Price 71

Allocation of Purchase Price of Assets Acquired and Liabilities Assumed, Flurry (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Aug. 25, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 808,114	$ 5,152,570		$ 4,679,648
Flurry, Inc.
Business Acquisition [Line Items]
Cash acquired			$ 12,139
Other tangible assets acquired			51,235
Amortizable intangible assets		55,000
Goodwill		$ 194,000	194,081
Total assets acquired			312,875
Liabilities assumed			(43,205)
Total			269,670
Flurry, Inc. | Developed Technology
Business Acquisition [Line Items]
Amortizable intangible assets			7,100
Flurry, Inc. | Customer Contracts and Related Relationships
Business Acquisition [Line Items]
Amortizable intangible assets			47,600
Flurry, Inc. | Other
Business Acquisition [Line Items]
Amortizable intangible assets			$ 720

Allocation of Purchase Price 72

Allocation of Purchase Price of Assets Acquired and Liabilities Assumed, BrightRoll (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 12, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 808,114	$ 5,152,570		$ 4,679,648
BrightRoll, Inc.
Business Acquisition [Line Items]
Cash acquired			$ 41,899
Accounts receivable, net			99,330
Other tangible assets acquired			55,923
Amortizable intangible assets		113,000
Goodwill		$ 417,000	416,580
Total assets acquired			726,832
Liabilities assumed			(145,667)
Total			581,165
Developed Technology | BrightRoll, Inc.
Business Acquisition [Line Items]
Amortizable intangible assets			19,400
Customer Contracts and Related Relationships | BrightRoll, Inc.
Business Acquisition [Line Items]
Amortizable intangible assets			85,600
Other | BrightRoll, Inc.
Business Acquisition [Line Items]
Amortizable intangible assets			$ 8,100

Allocation of Purchase Price 73

Allocation of Purchase Price of Assets Acquired and Liabilities Assumed, Polyvore (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 02, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 808,114		$ 5,152,570	$ 4,679,648
Polyvore, Inc.
Business Acquisition [Line Items]
Cash acquired		$ 6,019
Other tangible assets acquired		12,057
Amortizable intangible assets	19,000
Goodwill	$ 131,000	131,084
Total assets acquired		168,085
Liabilities assumed		(7,503)
Total		160,582
Polyvore, Inc. | Developed Technology
Business Acquisition [Line Items]
Amortizable intangible assets		17,550
Polyvore, Inc. | Tradename
Business Acquisition [Line Items]
Amortizable intangible assets		1,150
Polyvore, Inc. | Customer Contracts and Related Relationships
Business Acquisition [Line Items]
Amortizable intangible assets		$ 225

Goodwill (Detail)

Goodwill (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Beginning balance				$ 5,152,570	$ 4,679,648
Acquisitions and related adjustments				152,056	632,406
Goodwill impairment charge		$ (4,460,837)	$ (88,414)	(4,460,837)	(88,414)	$ (63,555)
Foreign currency translation adjustments				(35,675)	(71,070)
Ending balance		808,114	5,152,570	808,114	5,152,570	4,679,648
Americas Segment
Goodwill [Line Items]
Beginning balance	[1]			4,322,219	3,802,334
Acquisitions and related adjustments	[1]			130,450	522,156
Goodwill impairment charge	[1]			(3,929,576)
Foreign currency translation adjustments	[1]			(4,207)	(2,271)
Ending balance	[1]	518,886	4,322,219	518,886	4,322,219	3,802,334
Europe Middle East Africa Segment
Goodwill [Line Items]
Beginning balance	[2]			532,469	546,856
Acquisitions and related adjustments	[2]			21,606	110,857
Goodwill impairment charge	[2]			(531,261)	(79,135)
Foreign currency translation adjustments	[2]			(22,814)	(46,109)
Ending balance	[2]	0	532,469	0	532,469	546,856
Asia Pacific Segment
Goodwill [Line Items]
Beginning balance	[3]			297,882	330,458
Acquisitions and related adjustments	[3]				(607)
Goodwill impairment charge	[3]				(9,279)
Foreign currency translation adjustments	[3]			(8,654)	(22,690)
Ending balance	[3]	$ 289,228	$ 297,882	$ 289,228	$ 297,882	$ 330,458
[1]	Gross goodwill balances for the Americas segment were $3.8 billion as of January 1, 2014 and $4.4 billion as of December 31, 2015. The Americas segment includes accumulated impairment losses of $3.9 billion as of December 31, 2015.
[2]	Gross goodwill balances for the EMEA segment were $1.1 billion as of January 1, 2014 and $1.2 billion as of December 31, 2015. The EMEA segment includes accumulated impairment losses of $551 million as of January 1, 2014, and $1.2 billion as of December 31, 2015.
[3]	Gross goodwill balances for the Asia Pacific segment were $480 million as of January 1, 2014 and $448 million as of December 31, 2015. The Asia Pacific segment includes accumulated impairment losses of $150 million as of January 1, 2014 and $159 million as of December 31, 2015.

Goodwill (Parenthetical) (Detai

Goodwill (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Jan. 01, 2014
Americas Segment
Goodwill [Line Items]
Gross Goodwill Balance	$ 4,400	$ 3,800
Accumulated goodwill impairment	3,900
Europe Middle East Africa Segment
Goodwill [Line Items]
Gross Goodwill Balance	1,200	1,100
Accumulated goodwill impairment	1,200	551
Asia Pacific Segment
Goodwill [Line Items]
Gross Goodwill Balance	448	480
Accumulated goodwill impairment	$ 159	$ 150

Goodwill - Additional Informati

Goodwill - Additional Information (Detail) - USD ($)		3 Months Ended			12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 19, 2013
Goodwill [Line Items]
Goodwill impairment charge		$ 4,460,837,000	$ 88,414,000		$ 4,460,837,000	$ 88,414,000	$ 63,555,000
Goodwill		808,114,000	5,152,570,000	$ 4,679,648,000	808,114,000	5,152,570,000	4,679,648,000
Tumblr
Goodwill [Line Items]
Goodwill impairment charge					230,000,000
Goodwill		519,000,000		749,000,000	519,000,000		749,000,000	$ 748,979,000
Europe
Goodwill [Line Items]
Goodwill impairment charge					531,000,000
U.S. & Canada
Goodwill [Line Items]
Goodwill impairment charge					3,692,000,000
Latin America
Goodwill [Line Items]
Goodwill impairment charge					8,000,000
Europe Middle East Africa Segment
Goodwill [Line Items]
Goodwill impairment charge	[1]				531,261,000	79,135,000
Goodwill	[1]	0	532,469,000	546,856,000	0	532,469,000	546,856,000
Europe Middle East Africa Segment | Middle East
Goodwill [Line Items]
Goodwill impairment charge			79,000,000	63,555,000
Goodwill			0	77,000,000		0	77,000,000
Asia Pacific Segment
Goodwill [Line Items]
Goodwill impairment charge	[2]					9,279,000
Goodwill	[2]	$ 289,228,000	297,882,000	$ 330,458,000	$ 289,228,000	297,882,000	$ 330,458,000
Asia Pacific Segment | India and Southeast Asia
Goodwill [Line Items]
Goodwill impairment charge			9,000,000
Goodwill			$ 0			$ 0
[1]	Gross goodwill balances for the EMEA segment were $1.1 billion as of January 1, 2014 and $1.2 billion as of December 31, 2015. The EMEA segment includes accumulated impairment losses of $551 million as of January 1, 2014, and $1.2 billion as of December 31, 2015.
[2]	Gross goodwill balances for the Asia Pacific segment were $480 million as of January 1, 2014 and $448 million as of December 31, 2015. The Asia Pacific segment includes accumulated impairment losses of $150 million as of January 1, 2014 and $159 million as of December 31, 2015.

Intangible Assets Net (Detail)

Intangible Assets Net (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 592,976	$ 684,177
Accumulated Amortization	[1]	(245,707)	(213,335)
Net		347,269	470,842
Customer, Affiliate And Advertiser Related Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		355,568	369,914
Accumulated Amortization	[1]	(135,513)	(88,318)
Net		220,055	281,596
Developed Technology And Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		170,289	206,422
Accumulated Amortization	[1]	(83,380)	(83,748)
Net		86,909	122,674
Tradenames, Trademarks, And Domain Names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		67,119	107,841
Accumulated Amortization	[1]	(26,814)	(41,269)
Net		$ 40,305	$ 66,572
[1]	Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million for the both years ended as of December 31, 2014 and 2015.

Intangible Assets Net (Parenthe

Intangible Assets Net (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Cumulative foreign currency translation adjustments	$ 18	$ 18

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 136,719,000	$ 131,537,000	$ 96,518,000
Estimated amortization expense 2016	$ 114,000,000	114,000,000
Estimated amortization expense 2017	104,000,000	104,000,000
Estimated amortization expense 2018	84,000,000	84,000,000
Estimated amortization expense 2019	44,000,000	44,000,000
Estimated amortization expense 2020 and cumulatively thereafter	1,000,000	1,000,000
Impairment of definite-lived intangibles	0
Intangible assets, impairment charge	$ 15,423,000	15,423,000
Cost of revenue - other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 58,000,000	$ 65,000,000	$ 52,000,000
Minimum
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		1 year
Minimum | Customer, Affiliate And Advertiser Related Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		2 years
Minimum | Developed Technology And Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		1 year
Minimum | Tradenames, Trademarks, And Domain Names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		1 year
Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		7 years
Maximum | Customer, Affiliate And Advertiser Related Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		6 years
Maximum | Developed Technology And Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		6 years
Maximum | Tradenames, Trademarks, And Domain Names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life		7 years

Basic and Diluted Net Income 80

Basic and Diluted Net Income (loss) Attributable to Yahoo Inc. Common Stockholders Per Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	3	10

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income (loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2015	[1]	Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014	[5]	Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income (loss) attributable to Yahoo! Inc.		$ (4,434,987)		$ 76,261		$ (21,554)		$ 21,198		$ 166,344		$ 6,774,102		$ 269,707		$ 311,578		$ (4,359,082)	$ 7,521,731	$ 1,366,281
Less: Net income allocated to participating securities																			(68)	(28)
Net income (loss) attributable to Yahoo! Inc. common stockholders-basic																		$ (4,359,082)	$ 7,521,663	$ 1,366,253
Weighted average common shares		943,425		940,822		937,569		934,748		948,079		993,543		999,765		1,009,890		939,141	987,819	1,052,705
Net income (loss) attributable to Yahoo! Inc. common stockholders per share - basic		$ (4.70)		$ 0.08		$ (0.02)		$ 0.02		$ 0.18		$ 6.82		$ 0.27		$ 0.31		$ (4.64)	$ 7.61	$ 1.30
Net income (loss) attributable to Yahoo! Inc.		$ (4,434,987)		$ 76,261		$ (21,554)		$ 21,198		$ 166,344		$ 6,774,102		$ 269,707		$ 311,578		$ (4,359,082)	$ 7,521,731	$ 1,366,281
Less: Net income allocated to participating securities																			(67)	(28)
Less: Effect of dilutive securities issued by equity investees																			(43,689)	(16,656)
Net income (loss) attributable to Yahoo! Inc. common stockholders-diluted																		$ (4,359,082)	$ 7,477,975	$ 1,349,597
Denominator for basic calculation		943,425		940,822		937,569		934,748		948,079		993,543		999,765		1,009,890		939,141	987,819	1,052,705
Denominator for diluted calculation		943,425		946,934		937,569		947,976		962,626		1,007,693		1,014,692		1,031,420		939,141	1,004,108	1,070,811
Net income (loss) attributable to Yahoo! Inc. common stockholders per share - diluted		$ (4.70)		$ 0.08		$ (0.02)		$ 0.02		$ 0.17		$ 6.70		$ 0.26		$ 0.29		$ (4.64)	$ 7.45	$ 1.26
Restricted Stock Units (RSUs)
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares																			12,365	14,097
Stock Options and Employee Stock Purchase Plan
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares	[9]																		3,924	4,009
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.
[9]	At the beginning of the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees. See Note 14-"Employee Benefits" for additional information.

Investments in Equity Interes82

Investments in Equity Interests (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 2,503,229	$ 2,489,578
Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 2,496,657	$ 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	$ 6,572	$ 6,918
Percent ownership of common stock as of balance sheet date	20.00%	20.00%

Investments in Equity Interes83

Investments in Equity Interests Using the Equity Method of Accounting - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Dividends received from equity investees	$ 142,045	$ 83,685	$ 135,058
Alibaba Group
Schedule of Equity Method Investments [Line Items]
Royalty received	199,000	281,000	259,000
Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Fair value of the company's ownership interest in the common stock of Yahoo Japan	8,300,000
Dividends received from equity investees	142,045	83,685	77,000
Cash proceeds from sale of data center assets		11,000
Net gain on sale of data center assets		5,000
Cumulative earnings recorded in retained earnings	3,700,000	3,300,000
Revenue received through commercial arrangements with Yahoo Japan	228,000	253,000	$ 264,000
Receivables balance from Yahoo Japan	$ 37,000	$ 47,000

Yahoo Japan Condensed Financial

Yahoo Japan Condensed Financial Information Operating Data (Detail) - Yahoo Japan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Revenue	$ 3,769,410	$ 4,046,412	$ 4,296,522
Gross profit	2,983,880	3,262,450	3,577,001
Income from operations	1,609,403	1,896,368	2,150,644
Net income	1,092,657	1,236,583	1,365,443
Net income attributable to Yahoo Japan	$ 1,092,048	$ 1,225,221	$ 1,355,457

Yahoo Japan Condensed Financi85

Yahoo Japan Condensed Financial Information Balance Sheet Data (Detail) - Yahoo Japan - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Current assets	$ 6,150,688	$ 6,095,559
Long-term assets	2,430,699	1,973,946
Current liabilities	2,003,960	1,948,540
Long-term liabilities	245,834	35,418
Noncontrolling interests	$ 165,601	$ 66,998

Notional Amounts of Outstanding

Notional Amounts of Outstanding Forward Contracts (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative notional amount	$ 1,500	$ 2,100
Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
Derivative notional amount	1,150	1,647	$ 1,341
Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
Derivative notional amount	75	222	56
Not Designated as Hedging Instrument | Balance Sheet Hedges
Derivative [Line Items]
Derivative notional amount	$ 225	$ 243	$ 393

Foreign Currency Forward Contra

Foreign Currency Forward Contracts Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Derivative [Line Items]
Gain (Loss) Recorded in Other Income (Expense), Net	$ (4,376)		$ (15,978)		$ 10,852
Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
Beginning Fair Value	185,000		209,000
Settlement Payment (Receipt)	(117,000)		(234,000)
Gain (Loss) Recorded in Other Income (Expense), Net	1,000
Gain (Loss) Recorded in Other Comprehensive Income (Loss)	5,000	[1]	210,000	[2]
Ending Fair Value	74,000		185,000		209,000
Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
Beginning Fair Value	8,000		4,000
Settlement Payment (Receipt)			(4,000)
Gain (Loss) Recorded in Other Income (Expense), Net	(1,000)		(1,000)
Gain (Loss) Recorded in Other Comprehensive Income (Loss)	(2,000)		1,000
Gain (Loss) Recorded in Revenue	(3,000)		8,000
Ending Fair Value	2,000		8,000		4,000
Not Designated as Hedging Instrument | Balance Sheet Hedges
Derivative [Line Items]
Beginning Fair Value	4,000		0
Settlement Payment (Receipt)	(21,000)		(12,000)
Gain (Loss) Recorded in Other Income (Expense), Net	19,000		16,000
Ending Fair Value	2,000		4,000		$ 0
Gain (Loss) Recorded in Other Comprehensive Income (Loss)	$ 0		$ 0
[1]	This amount does not reflect the tax impact of $2 million recorded during the twelve months ended December 31, 2015. The $3 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company's consolidated balance sheets as of December 31, 2015.
[2]	This amount does not reflect the tax impact of $79 million recorded during the twelve months ended December 31, 2014. The $131 million after tax impact of the gain recorded within other comprehensive income (Loss) was included in accumulated other comprehensive income on the Company's consolidated balance sheets as of December 31, 2014.

Foreign Currency Forward Cont88

Foreign Currency Forward Contracts Activity (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Net investment hedge CTA gains (losses), taxes	$ (1,941)	$ (79,037)	$ (192,369)
Net investment hedge CTA gains (losses), net of taxes	$ 3,333	$ 130,904	$ 317,459

Foreign Currency Forward Cont89

Foreign Currency Forward Contracts Balance Sheet Location and Ending Fair Value (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Designated as Hedging Instrument | Net Investment Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency forward contract, fair value asset	[1]	$ 79	$ 190
Designated as Hedging Instrument | Net Investment Hedges | Liabilities
Derivatives, Fair Value [Line Items]
Foreign currency forward contract, fair value liability	[2]	(5)	(5)
Designated as Hedging Instrument | Cash Flow Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency forward contract, fair value asset	[1]	2	8
Not Designated as Hedging Instrument | Balance Sheet Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency forward contract, fair value asset	[1]	3	5
Not Designated as Hedging Instrument | Balance Sheet Hedges | Liabilities
Derivatives, Fair Value [Line Items]
Foreign currency forward contract, fair value liability	[2]	$ (1)	$ (1)
[1]	Included in prepaid expenses and other current assets or other long-term assets and investments on the consolidated balance sheets.
[2]	Included in accrued expenses and other current liabilities or other long-term liabilities on the consolidated balance sheets.

Credit Agreement - Additional I

Credit Agreement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)
Line of Credit Facility [Line Items]
Unsecured revolving credit facility, outstanding	$ 0
Eurodollar | Minimum
Line of Credit Facility [Line Items]
Unsecured revolving credit facility, applicable margin on borrowing rate	1.00%
Eurodollar | Maximum
Line of Credit Facility [Line Items]
Unsecured revolving credit facility, applicable margin on borrowing rate	1.25%
Base Rate | Minimum
Line of Credit Facility [Line Items]
Unsecured revolving credit facility, applicable margin on borrowing rate	0.00%
Base Rate | Maximum
Line of Credit Facility [Line Items]
Unsecured revolving credit facility, applicable margin on borrowing rate	0.25%
After Amendment
Line of Credit Facility [Line Items]
Unsecured revolving credit facility expiration date	Jul. 22, 2016
Unsecured revolving credit facility	$ 750,000,000
Unsecured revolving credit facility, additional commitment	$ 250,000,000

Convertible Notes - Additional

Convertible Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Debt Instrument [Line Items]
Payments for note hedge transactions			$ 205,706
Proceeds from issuance of warrants			$ 124,775
Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes percent		0.00%	0.00%
Principal		$ 1,437,500		$ 1,437,500
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%
Initial conversion price		$ 53.43
Maturity date, convertible senior note		Dec. 1, 2018
Effective interest rate		5.26%
Equity component	[1]	$ 305,569		$ 305,569
Deferred tax liability		$ 37,000
Payments for note hedge transactions			$ 205,706
Warrant expiration period			2019-03
Strike price of warrants			$ 71.24
Proceeds from issuance of warrants			$ 124,775
[1]	Recorded on the consolidated balance sheet within additional paid-in capital.

Schedule of Notes (Detail)

Schedule of Notes (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Net carrying amount		$ 1,233,485	$ 1,170,423
Convertible Senior Notes
Debt Instrument [Line Items]
Principal		1,437,500	1,437,500
Less: note discount		(204,015)	(267,077)
Net carrying amount		1,233,485	1,170,423
Equity component	[1]	$ 305,569	$ 305,569
[1]	Recorded on the consolidated balance sheet within additional paid-in capital.

Interest Expense Recognized Rel

Interest Expense Recognized Related To Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Accretion of convertible note discount	$ 63,061	$ 59,838	$ 4,846

Fair Value and Carrying Value o

Fair Value and Carrying Value of Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying Value	$ 1,233,485	$ 1,170,423
Convertible Senior Notes
Debt Instrument [Line Items]
Carrying Value	1,233,485	1,170,423
Fair Value Measurements At Reporting Date Using Level 2 | Convertible Senior Notes
Debt Instrument [Line Items]
Fair Value	$ 1,250,124	$ 1,175,240

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	May. 15, 2013USD ($)	Nov. 16, 2011USD ($)	Jan. 31, 2016Defendant	Dec. 31, 2014Building	Dec. 31, 2015USD ($)LegalMatterBuilding	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Nov. 28, 2012USD ($)	Dec. 07, 2011USD ($)
Commitments and Contingencies Disclosure [Line Items]
Operating lease commitment					$ 416,000,000
Rent expense for operating leases					77,000,000	$ 86,000,000	$ 77,000,000
Non-cancelable commitments					136,000,000
Payable in 2016					91,000,000
Payable in 2017					25,000,000
Payable in 2018					18,000,000
Payable in 2019					2,000,000
Intellectual property arrangements through 2023					$ 16,000,000
Intellectual property arrangements, expiration year					2,023
Standby letters of credit outstanding					$ 42,000,000
Maximum
Commitments and Contingencies Disclosure [Line Items]
Operating and capital lease agreements, original lease period					15 years
Operating and capital lease agreements, expiry year					2,025
Payable in 2020 and thereafter					$ 1,000,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Operating and capital lease agreements, expiry year					2,016
Non-Final Judgment
Commitments and Contingencies Disclosure [Line Items]
Counterclaim filed for payments of services rendered								$ 2,600,000
Affiliate Commitments
Commitments and Contingencies Disclosure [Line Items]
Total commitments					$ 1,539,000,000
Payable in 2016					383,000,000
Payable in 2017					375,000,000
Payable in 2018					375,000,000
Payable in 2019					375,000,000
Payable in 2020					31,000,000
Construction Liabilities
Commitments and Contingencies Disclosure [Line Items]
Total commitments					20,000,000
Payable in 2016					1,000,000
Payable in 2017					2,000,000
Payable in 2018					2,000,000
Payable in 2019					2,000,000
Payable in 2020					2,000,000
Payable thereafter					$ 11,000,000
California | Buildings
Commitments and Contingencies Disclosure [Line Items]
Number of buildings obligated to make payments for notes payable | Building					2
Note Payable Obligations					$ 56,000,000
Payable in 2016					4,000,000
Payable in 2017					5,000,000
Payable in 2018					5,000,000
Payable in 2019					5,000,000
Payable in 2020					5,000,000
Payable thereafter					32,000,000
Buildings | California
Commitments and Contingencies Disclosure [Line Items]
Lease period				10 years
Number of buildings leased | Building				3
Buildings | California | Maximum
Commitments and Contingencies Disclosure [Line Items]
Operating lease commitment					$ 40,000,000
Operating lease additional lease term renewal period, in years				7 years
Buildings | California | Minimum
Commitments and Contingencies Disclosure [Line Items]
Operating lease additional lease term renewal period, in years				5 years
Buildings | California | Operating lease commitment
Commitments and Contingencies Disclosure [Line Items]
Number of buildings leased | Building				2
Buildings | California | Build-to-suit lease
Commitments and Contingencies Disclosure [Line Items]
Number of buildings leased | Building				1
Stockholder Class Action
Commitments and Contingencies Disclosure [Line Items]
Number of purported stockholder class action suits filed | LegalMatter					2
Worldwide directories, SA de CV and Ideas Interactivas, SA de CV | Settled Litigation
Commitments and Contingencies Disclosure [Line Items]
Counterclaim filed for payments of services rendered	$ 2,600,000
Loss Contingency	$ 172,500
Worldwide directories, SA de CV and Ideas Interactivas, SA de CV | Pending Litigation
Commitments and Contingencies Disclosure [Line Items]
Alleged total damages		$ 2,750,000,000
Counterclaim filed for payments of services rendered									$ 2,600,000
TCPA Litigation Concerning Yahoo Messenger
Commitments and Contingencies Disclosure [Line Items]
Penalty per violation, minimum					$ 500
Penalty per violation, maximum					$ 1,500
TCPA Litigation Concerning Yahoo Messenger | Subsequent Event
Commitments and Contingencies Disclosure [Line Items]
Number of members comprised in the certified class | Defendant			300,000

Lease Commitments (Detail)

Lease Commitments (Detail) $ in Millions	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Line Items]
Gross operating lease commitments, years ending December 31, 2016	$ 121
Gross operating lease commitments, 2017	91
Gross operating lease commitments, 2018	63
Gross operating lease commitments, 2019	48
Gross operating lease commitments, 2020	35
Gross operating lease commitments, due after 5 years	104
Total gross operating lease commitments	462
Sublease income, years ending December 31, 2016	(13)
Sublease income, 2017	(11)
Sublease income, 2018	(8)
Sublease income, 2019	(6)
Sublease income, 2020	(3)
Sublease income, due after 5 years	(5)
Total sublease income	(46)
Net operating lease commitments, years ending December 31, 2016	108
Net operating lease commitments, 2017	80
Net operating lease commitments, 2018	55
Net operating lease commitments, 2019	42
Net operating lease commitments, 2020	32
Net operating lease commitments, due after 5 years	99
Total net operating lease commitments	$ 416

Capital Lease Commitment (Detai

Capital Lease Commitment (Detail) $ in Millions	Dec. 31, 2015USD ($)
Schedule of Capital Lease Obligations [Line Items]
Years ending December 31, 2016	$ 15
2,017	10
2,018	9
2,019	5
2,020	0
Due after 5 years	0
Gross capital lease commitments	39
Less: interest	6
Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities	$ 33

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Dec. 09, 2014	Oct. 17, 2014	Jul. 25, 2013	Oct. 31, 2014	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015	Nov. 30, 2013
Stockholders Equity [Line Items]
Preferred stock, shares authorized						10,000,000	10,000,000
Payment for repurchases of common stock						$ 203,771,000	$ 4,163,227,000	$ 3,344,396,000
Line of Credit borrowings to fund repurchase transaction								$ 150,000,000
Stock repurchased and retired							94,000,000	198,000,000
Treasury stocks retired						0
Common stock
Stockholders Equity [Line Items]
Repurchases of common stock, shares						4,276,000	61,838,000	128,863,000
Common stock retired							$ 94,000	$ 198,000
Additional Paid-in Capital
Stockholders Equity [Line Items]
Retirement of treasury stock							795,000,000	1,600,000,000
Retained earnings
Stockholders Equity [Line Items]
Retirement of treasury stock							2,900,000,000	$ 2,900,000,000
May 2012 Plan
Stockholders Equity [Line Items]
Repurchases of common stock, shares								129,000,000
Average purchase price per share of common stock repurchased during the period								$ 25.95
Repurchases of common stock, value								$ 3,300,000,000
Line of Credit borrowings to fund repurchase transaction			$ 150,000,000
November 2013 Plan
Stockholders Equity [Line Items]
Treasury stock acquired repurchase authorization value										$ 5,000,000,000
Stock repurchase program expiration date						2016-12
Remaining authorized purchase capacity						$ 726,000,000	$ 930,000,000
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
Share repurchase from Third Point
Stockholders Equity [Line Items]
Repurchases of common stock, shares			40,000,000
Average purchase price per share of common stock repurchased during the period			$ 29.11
Repurchases of common stock, value			$ 1,200,000,000
March 2015 Plan
Stockholders Equity [Line Items]
Treasury stock acquired repurchase authorization value									$ 2,000,000,000
Stock repurchase program expiration date						2018-03
Remaining authorized purchase capacity						$ 2,000,000,000
Stock Repurchase Program
Stockholders Equity [Line Items]
Repurchases of common stock, shares							62,000,000
Average purchase price per share of common stock repurchased during the period							$ 39.30
Repurchases of common stock, value							$ 2,400,000,000
Accelerated Share Repurchases
Stockholders Equity [Line Items]
Repurchases of common stock, shares	16,000,000	23,500,000		15,000,000	15,000,000
Repurchases of common stock, value	$ 800,000,000	$ 933,000,000			$ 600,000,000
Payment for repurchases of common stock				$ 1,000,000,000	1,100,000,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 200,000,000	$ 167,000,000
Accelerated share repurchase agreement, unsettled contract					$ 500,000,000
Accelerated Share Repurchases | Common stock
Stockholders Equity [Line Items]
Repurchases of common stock, shares							39,859,000

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail)	Jul. 26, 2012USD ($)	Nov. 30, 2012USD ($)	Dec. 31, 2015USD ($)Installment$ / sharesshares	Dec. 31, 2014USD ($)$ / shares	Dec. 31, 2013USD ($)$ / shares	Dec. 31, 2012USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rate at which the company matches employee contributions			25.00%
Stock-based compensation expense			$ 457,153,000	$ 420,174,000	$ 278,220,000
Weighted-average grant date fair value of all options granted and assumed during period | $ / shares			$ 20.31	$ 31.31	$ 18.72
Payments made to taxing authorities for employees' tax obligations			$ 257,731,000	$ 280,879,000	$ 139,815,000
Excess tax benefits from stock-based awards			$ 58,282,000	$ 149,582,000	$ 64,407,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested | shares			16,969,000
Shares withheld to settle employees' minimum statutory obligation for applicable income and other employment taxes | shares			7,000,000
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			4 years	4 years	4 years
Stock-based compensation, recognition period			12 months
Performance Based Restricted Stock Units | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			3 years	3 years	3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised			$ 53,000,000	$ 167,000,000	$ 122,000,000
Unamortized stock-based compensation expense			$ 17,000,000
Stock-based compensation, recognition period			1 year 8 months 12 days
Cash received from options exercised			$ 59,000,000
Tax benefit from stock option exercises			15,000,000
Restricted Stock Awards And Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense			$ 685,000,000
Stock-based compensation, recognition period			2 years 3 months 18 days
Total fair value of restricted stock awards vested			$ 502,000,000	415,000,000	220,000,000
First Tranche | Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, recognition period			12 months
Stock options grant date fair value			$ 31,000,000
First Tranche | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units grant date fair value			9,000,000
Second Tranche | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units grant date fair value			11,000,000
Tranche Three | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units grant date fair value			$ 19,000,000
GAAP Revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial performance metrics for stock option awards			33.3333%
Financial performance metrics for restricted stock units awards			33.3333%
Revenue ex -TAC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial performance metrics for stock option awards			33.3333%
Financial performance metrics for restricted stock units awards			33.3333%
Adjusted EBITDA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial performance metrics for stock option awards			33.3333%
Financial performance metrics for restricted stock units awards			33.3333%
Stock Plan | Options Granted Prior To May 19, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock awards, years			10 years
Stock Plan | Options Granted After May 19, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock awards, years			7 years
Stock Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to be awarded | shares			784,000,000
Shares available for issuance | shares			97,000,000
Stock Plan | Full Value Stock Award | Other Than Options Granted After June 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted against share limits | shares			1.75
Stock Plan | Full Value Stock Award | Other Than Options Granted After June 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted against share limits | shares			2.5
Directors' Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to be awarded | shares			9,000,000
Shares available for issuance | shares			5,000,000
Number of shares granted against share limits | shares			1.75
Directors' Plan | Options Granted After May 25, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock awards, years			7 years
Equity award vesting period			1 year
Vesting period installments			Equal quarterly installments over one year
Directors' Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			1 year
CEO 2012 Annual Equity Awards | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period	3 years
Equity award granted	$ 6,000,000
CEO 2012 Annual Equity Awards | Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period		2 years 6 months
Equity award granted		$ 6,000,000
CEO One-Time Retention Award | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period	5 years
Equity award granted	$ 15,000,000
CEO One-Time Retention Award | Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period		4 years 6 months
Equity award granted		$ 15,000,000
CEO Make-Whole Restricted Stock Units | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted stock awards vested				3,000,000	7,000,000	$ 4,000,000
Equity award granted	$ 14,000,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 2,000,000	12,000,000	16,000,000
Unamortized stock-based compensation expense			$ 0
Employee Stock Purchase Plan | Prior to November 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price as a percentage of fair value of common stock purchased under employee stock purchase plan			85.00%
Employee stock purchase plan offering period			24 months
Employee Stock Purchase Plan | Beginning in November 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price as a percentage of fair value of common stock purchased under employee stock purchase plan			90.00%
Employee stock purchase plan offering period			3 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			4 years
Maximum | Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage for each performance period			100.00%
Maximum | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage of annual target amount based on performance			200.00%
Maximum | Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			4 years
Maximum | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan payroll deductions percent			15.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			1 year
Minimum | Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage for each performance period			0.00%
Minimum | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage of annual target amount based on performance			0.00%
Initial Grant | Directors' Plan | Options Granted Before May 25, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			4 years
Vesting period installments			Equal monthly installments over four years
Annual Grant | Directors' Plan | Options Granted Before May 25, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage upon one year anniversary of date of grant			25.00%
Number of installments for vesting period | Installment			36
Annual Grant | Maximum | Directors' Plan | Options Granted Before May 25, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock awards, years			10 years
Annual Grant | Minimum | Directors' Plan | Options Granted Before May 25, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock awards, years			7 years
401(k) Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Benefit plan employee contribution			100.00%
401(k) Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Benefit plan employee contribution			1.00%
401(k)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contributions to benefit plans			$ 21,000,000	19,000,000	18,000,000
Other Foreign Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contributions to benefit plans			$ 15,000,000	$ 16,000,000	$ 17,000,000

Stock Option Activity (Detail)

Stock Option Activity (Detail) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options, Beginning balance	[1]	9,225
Stock options granted during the period		0
Stock options assumed in acquisitions during the period		407
Stock options exercised during the period	[2]	(2,168)
Stock options expired during the period		(585)
Stock options cancelled/forfeited during the period		(357)
Outstanding stock options, Ending balance	[1]	6,522	9,225
Vested and expected to vest, outstanding, balance	[3]	6,338
Exercisable at December 31, 2015		3,925
Weighted average exercise price of options outstanding, Beginning balance	[1]	$ 18.57
Weighted-average exercise price of shares granted during period		0
Weighted-average exercise price of shares assumed in acquisitions during period		11.89
Weighted-average exercise price of shares exercised during period	[2]	16.23
Weighted-average exercise price of shares expired during period		19.09
Weighted-average exercise price of shares cancelled/forfeited during period		19.75
Weighted average exercise price of options outstanding, Ending balance	[1]	18.82	$ 18.57
Vested and expected to vest, weighted average exercise price	[3]	17.48
Exercisable at December 31, 2015, weighted average exercise price		$ 17.40
Outstanding at December 31, weighted average remaining contractual life, years	[1]	4 years 11 days	4 years 3 months 29 days
Vested and expected to vest, weighted average remaining contractual life, years	[3]	3 years 11 months 23 days
Vested and expected to vest, exercisable, weighted average remaining contractual life, years		3 years 5 months 1 day
Aggregate intrinsic value, outstanding, Beginning balance	[1]	$ 274,072
Aggregate intrinsic value, outstanding, Ending balance	[1]	103,230	$ 274,072
Vested and expected to vest, aggregate intrinsic value	[3]	100,310
Exercisable at December 31, 2015		$ 62,553
[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.
[3]	The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total outstanding options.

Weighted Average Assumptions Us

Weighted Average Assumptions Used to Calculate Fair Value of Options Granted Including Assumed Options from Acquisitions (Detail)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	[1],[2]		0.00%	0.00%
Risk-free interest rate	[1],[3]		0.00%	0.10%
Expected volatility	[1],[4]		36.80%	31.70%
Expected life (in years)	[1],[5]		3 months	3 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	[2]	0.00%	0.00%	0.00%
Risk-free interest rate	[3]	0.90%	1.40%	0.70%
Expected volatility	[4]	34.50%	34.50%	33.30%
Expected life (in years)	[5]	2 years 6 months	3 years 9 months 29 days	3 years 7 months 6 days
[1]	Assumptions for the Employee Stock Purchase Plan relate to the annual average of the enrollment periods. During the year ended December 31, 2012, enrollment was permitted in May and November of each year. Beginning in 2013, enrollment was permitted in February, May, August, and November of each year. During the first quarter of 2015, the Company discontinued the offering of the Employee Stock Purchase Plan to its employees.
[2]	The Company currently has no history or expectation of paying cash dividends on its common stock in the near future.
[3]	The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected term of the awards in effect at the time of grant.
[4]	The Company estimates the volatility of its common stock at the date of grant based on the implied volatility of publicly traded options on its common stock, with a term of one year or greater.
[5]	The expected life of stock options granted under the Plans is based on historical exercise patterns, which the Company believes are representative of future behavior. New grants issued by the Company had an expected life of 4 years in 2013 and 4 years in 2014. In 2015, the Company did not issue new stock options. Options assumed in acquisitions had expected lives of less than 3 years.

Weighted Average Assumptions102

Weighted Average Assumptions Used to Calculate Fair Value of Options Granted Including Assumed Options from Acquisitions (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of new grants issued		4 years	4 years
Expected life of options assumed in acquisitions	Less than 3 years

Restricted Stock Units Activity

Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) shares in Thousands	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded and unvested, Beginning balance | shares	40,677	[1]
Granted | shares	16,899	[2]
Assumed in acquisitions | shares	0
Vested | shares	(16,969)
Forfeited | shares	(11,868)
Awarded and unvested, Ending balance | shares	28,739	[1]
Weighted-average grant date fair value per share, Beginning balance | $ / shares	$ 32.38	[1]
Weighted-average grant date fair value per share, granted shares | $ / shares	41.53	[2]
Weighted-average grant date fair value per share, assumed in acquisitions | $ / shares	0
Weighted-average grant date fair value per share, vested shares | $ / shares	29.61
Weighted-average grant date fair value per share, forfeited shares | $ / shares	32.99
Weighted-average grant date fair value per share, Ending balance | $ / shares	$ 39.15	[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]	Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the year ended December 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 year ended December 31, 2015.

Restructuring Charges (Reversal

Restructuring Charges (Reversals), Net (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Employee severance pay and related costs									$ 69,042	$ 30,749	$ 12,337
Non-cancelable lease, contract termination, and other charges									36,526	79,317	15,822
Reversals of previous charges									(7,404)	(3,222)	(24,940)
Non-cash accelerations of stock-based compensation expense									2,705
Other non-cash charges (credits), net									3,150	(3,394)	547
Restructuring charges, net	$ 7,000	$ 26,000	$ 20,000	$ 51,000	$ 33,000	$ 8,000	$ 53,000	$ 9,000	$ 104,019	$ 103,450	$ 3,766

Restructuring Charges, Net by S

Restructuring Charges, Net by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 7,000	$ 26,000	$ 20,000	$ 51,000	$ 33,000	$ 8,000	$ 53,000	$ 9,000	$ 104,019	$ 103,450	$ 3,766
Americas Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net									68,637	76,134	571
Europe Middle East Africa Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net									31,251	25,612	2,862
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net									$ 4,131	$ 1,704	$ 333

Restructuring Accrual Activity

Restructuring Accrual Activity (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning balance				$ 83,608				$ 30,096	$ 83,608	$ 30,096
Restructuring charges	$ 7,000	$ 26,000	$ 20,000	$ 51,000	$ 33,000	$ 8,000	$ 53,000	$ 9,000	104,019	103,450	$ 3,766
Cash paid									(114,749)	(52,301)
Non-cash accelerations of stock-based compensation expense									(2,705)
Foreign currency translation and other adjustments									(4,282)	2,363
Ending balance	$ 65,891				$ 83,608				$ 65,891	$ 83,608	$ 30,096

Restructuring Charges (Rever107

Restructuring Charges (Reversals), Net - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 65,891	$ 83,608	$ 30,096
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liability	15,000
Non-Cancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 51,000

Classification of Restructuring

Classification of Restructuring Accruals (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Accrued expenses and other current liabilities	$ 40,283	$ 47,356
Other long-term liabilities	25,608	36,252
Total restructuring accruals	$ 65,891	$ 83,608	$ 30,096

Restructuring Accrual by Segmen

Restructuring Accrual by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 65,891	$ 83,608	$ 30,096
Americas Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	47,054	65,949
Europe Middle East Africa Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	18,389	16,797
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 448	$ 862

Income (Loss) Before Income Tax

Income (Loss) Before Income Taxes and Earnings in Equity Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]
United States	$ (4,394,462)	$ 10,572,290	$ 538,824
Foreign	(429,814)	(59,909)	94,459
Income (loss) before income taxes and earnings in equity interests	$ (4,824,276)	$ 10,512,381	$ 633,283

Provision For Income Tax (Detai

Provision For Income Tax (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014	[5]	Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
United States federal																	$ (89,498)	$ 3,067,395	$ 138,032
State																	9,426	454,261	49,872
Foreign																	32,815	50,573	49,790
Total current provision (benefit) for income taxes																	(47,257)	3,572,229	237,694
Deferred:
United States federal																	(20,507)	348,887	(63,166)
State																	(31,374)	120,938	(22,498)
Foreign																	9,540	(3,952)	1,362
Total deferred provision (benefit) for income taxes																	(42,341)	465,873	(84,302)
Provision (benefit) for income taxes	$ (13,985)		$ (93,208)		$ 58,495		$ (40,900)		$ 52,340		$ 3,973,402		$ 8,143		$ 4,217		$ (89,598)	$ 4,038,102	$ 153,392
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Reconciliation Tax Computed by

Reconciliation Tax Computed by Applying Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014	[5]	Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Statutory Federal Tax Rate [Line Items]
Income tax at the U.S. federal statutory rate of 35 percent																	$ (1,688,496)	$ 3,679,333	$ 221,648
State income taxes, net of federal benefit																	(7,912)	400,824	23,000
Stock-based compensation expense																	9,508	8,132	16,015
Research tax credits																	(15,659)	(23,775)	(18,036)
Effect of non-U.S. operations																	165,203	(53,079)	(47,968)
Settlement with tax authorities																	(1,981)	(24,870)	(46,943)
Remeasurement of prior year tax positions																	(5,286)		(24,246)
Acquisition related non-deductible expenses																	15,970	16,881	9,296
Tax liquidation of acquired entities																	(56,170)
Other																	5,965	3,711	(1,618)
Provision (benefit) for income taxes	$ (13,985)		$ (93,208)		$ 58,495		$ (40,900)		$ 52,340		$ 3,973,402		$ 8,143		$ 4,217		(89,598)	4,038,102	153,392
Goodwill
Reconciliation of Statutory Federal Tax Rate [Line Items]
Impairment charge																	1,486,792	$ 30,945	$ 22,244
Indefinite-lived Intangible Assets [Member]
Reconciliation of Statutory Federal Tax Rate [Line Items]
Impairment charge																	$ 2,468
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Deferred Income Tax Assets and

Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Net operating loss and tax credit carryforwards	$ 185,425	$ 156,385
Stock-based compensation expense	34,644	55,951
Non-deductible accrued expenses	114,519	118,457
Deferred revenue	10,153	90,023
Fixed assets	14,096	18,059
Federal benefits relating to tax positions	308,347	320,185
Other	8,580	8,104
Gross deferred income tax assets	675,764	767,164
Valuation allowance	(29,001)	(23,853)
Deferred income tax assets	646,763	743,311
Deferred income tax liabilities:
Purchased intangible assets	(86,905)	(200,569)
Fixed assets	(146,234)	(174,196)
Alibaba unrealized gains	(12,611,867)	(16,154,906)
Unrealized income in investments	(85,761)	(75,368)
Restructuring liabilities	(4,046)	(8,224)
Other	(2,216)	(3,271)
Deferred income tax liabilities	(12,937,029)	(16,616,534)
Net deferred income tax liabilities	$ (12,290,266)	$ (15,873,223)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	Sep. 24, 2014	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Alibaba deferred tax liabilities			$ 12,611,867	$ 16,154,906
Tax payment related to YHK's sale of Alibaba Group ADSs		$ 3,300,000
Valuation allowance			29,001	23,853
Net tax expense (benefit) from one-time distribution of earnings from consolidated foreign subsidiaries				8,000	$ (36,000)	$ (117,000)
Undistributed earnings of foreign subsidiaries			3,300,000
Unrecognized tax benefits			1,067,109	1,023,626	695,285	$ 727,367
Amount of unrecognized tax benefits which would affect the effective tax rate if realized			700,000
Interest and penalties expense			7,000	83,000	21,000
Accrued interest and penalties			167,000	$ 159,000
Interest received					$ 4,000
Unrecognized tax benefits increase during period			43,000
Reasonably possible reduction in unrecognized tax benefits in the next twelve months			149,000
State Research Tax Credit Carryforward
Income Taxes [Line Items]
Tax credit carryforwards			$ 168,000
Start of expiration of tax credit carryforwards			Carried forward indefinitely
Federal And California Jurisdiction
Income Taxes [Line Items]
Start of expiration of operating loss carryforwards			2,021
Federal
Income Taxes [Line Items]
Net operating loss carryforwards			$ 338,000
California | State
Income Taxes [Line Items]
Net operating loss carryforwards			152,000
Tax authorities from the Brazilian State | Foreign Tax Authority
Income Taxes [Line Items]
Indirect tax assessed, not accrued			$ 92,000
Tax authorities from the Brazilian State | Foreign Tax Authority | Earliest Tax Year
Income Taxes [Line Items]
Tax assessment year			2,008
Tax authorities from the Brazilian State | Foreign Tax Authority | Latest Tax Year
Income Taxes [Line Items]
Tax assessment year			2,011
Alibaba Group
Income Taxes [Line Items]
Shares retained by the Company			384
Number of ADSs sold at initial public offering	140
Sale of investments in equity interests, shares						523

Reconciliation of Beginning and

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Unrecognized tax benefits balance at January 1	$ 1,023,626	$ 695,285	$ 727,367
Gross increase for tax positions of prior years	27,583	65,606	69,188
Gross decrease for tax positions of prior years	(17,748)	(9,954)	(40,298)
Gross increase for tax positions of current year	41,428	358,434	34,556
Settlements	(4,700)	(84,942)	(94,640)
Lapse of statute of limitations	(3,080)	(803)	(888)
Unrecognized tax benefits balance at December 31	$ 1,067,109	$ 1,023,626	$ 695,285

Unrecognized Tax Benefits Recor

Unrecognized Tax Benefits Recorded on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Total unrecognized tax benefits balance	$ 1,067,109	$ 1,023,626	$ 695,285	$ 727,367
Amounts netted against related deferred tax assets	(64,601)	(53,500)
Unrecognized tax benefits recorded on consolidated balance sheets	1,002,508	970,126
Amounts classified as accrued expenses and other current liabilities	12,586	2,179
Amounts classified as deferred and other long-term tax liabilities, net	989,922	967,947
Unrecognized tax benefits recorded on consolidated balance sheets	$ 1,002,508	$ 970,126

Transactions with Related Pa117

Transactions with Related Parties - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Percent of total revenue	35.00%	35.00%	31.00%
Revenue From Related Parties Other Than Yahoo Japan
Related Party Transaction [Line Items]
Percent of total revenue	1.00%	1.00%	1.00%

Segment Information (Detail)

Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue		$ 1,273,393	[1]	$ 1,225,673	[2]	$ 1,243,265	[3]	$ 1,225,970	[4]	$ 1,253,072	[5]	$ 1,148,140	[6]	$ 1,084,191	[7]	$ 1,132,730	[8]	$ 4,968,301	$ 4,618,133	$ 4,680,380
TAC																		877,514	217,531	254,442
Revenue ex-TAC																		4,090,787	4,400,602	4,425,938
Global operating costs	[9],[10]																	2,547,368	2,566,954	2,398,388
Gains on sales of patents						(9,000)		(2,000)		(35,000)				(62,000)				(11,100)	(97,894)	(79,950)
Asset impairment charge		2,000																44,381
Goodwill impairment charge		4,460,837								88,414								4,460,837	88,414	63,555
Intangibles impairment charge		15,423																15,423
Restructuring charges, net		7,000		26,000		20,000		51,000		33,000		8,000		53,000		9,000		104,019	103,450	3,766
Depreciation and amortization																		609,613	606,568	628,778
Stock-based compensation expense																		457,153	420,174	278,220
Income (loss) from operations		$ (4,530,034)	[1]	$ (86,312)	[2]	$ (44,794)	[3]	$ (87,354)	[4]	$ 32,154	[5]	$ 42,172	[6]	$ 38,437	[7]	$ 30,179	[8]	(4,748,494)	142,942	589,926
Americas Segment
Segment Reporting Information [Line Items]
Revenue																		3,976,770	3,517,861	3,481,502
TAC																		788,725	166,545	158,974
Revenue ex-TAC																		3,188,045	3,351,316	3,322,528
Direct costs by segment	[11]																	319,744	283,594	256,945
Goodwill impairment charge	[12]																	3,929,576
Restructuring charges, net																		68,637	76,134	571
Europe Middle East Africa Segment
Segment Reporting Information [Line Items]
Revenue																		343,646	374,833	385,186
TAC																		57,284	36,867	42,915
Revenue ex-TAC																		286,362	337,966	342,271
Direct costs by segment	[11]																	95,789	87,490	89,478
Goodwill impairment charge	[13]																	531,261	79,135
Restructuring charges, net																		31,251	25,612	2,862
Asia Pacific Segment
Segment Reporting Information [Line Items]
Revenue																		647,885	725,439	813,692
TAC																		31,505	14,119	52,553
Revenue ex-TAC																		616,380	711,320	761,139
Direct costs by segment	[11]																	196,054	198,910	196,832
Goodwill impairment charge	[14]																		9,279
Restructuring charges, net																		$ 4,131	$ 1,704	$ 333
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.
[9]	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.
[10]	The net cost reimbursements from Microsoft pursuant to the Search Agreement are primarily included in global operating costs. Operating costs and expenses consist of cost of revenue-TAC; cost of revenue-other; sales and marketing, product development; general and administrative; amortization of intangible assets; and restructuring charges, net. Cost of revenue-other consists of bandwidth costs and other expenses associated with the production and usage of Yahoo Properties, including content expense and amortization of acquired intellectual property rights and developed technology.
[11]	Direct costs for each segment include costs associated with the local sales teams and other cost of revenue.
[12]	Gross goodwill balances for the Americas segment were $3.8 billion as of January 1, 2014 and $4.4 billion as of December 31, 2015. The Americas segment includes accumulated impairment losses of $3.9 billion as of December 31, 2015.
[13]	Gross goodwill balances for the EMEA segment were $1.1 billion as of January 1, 2014 and $1.2 billion as of December 31, 2015. The EMEA segment includes accumulated impairment losses of $551 million as of January 1, 2014, and $1.2 billion as of December 31, 2015.
[14]	Gross goodwill balances for the Asia Pacific segment were $480 million as of January 1, 2014 and $448 million as of December 31, 2015. The Asia Pacific segment includes accumulated impairment losses of $150 million as of January 1, 2014 and $159 million as of December 31, 2015.

Capital Expenditures by Segment

Capital Expenditures by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 542,987	$ 395,615	$ 338,131
Americas Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	490,780	357,512	309,215
Europe Middle East Africa Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	25,479	20,034	11,435
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 26,728	$ 18,069	$ 17,481

Property and Equipment Net by S

Property and Equipment Net by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 1,547,323	$ 1,487,684
Americas Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	1,448,348	1,383,384
Americas Segment | United States
Segment Reporting Information [Line Items]
Total property and equipment, net	1,447,995	1,382,597
Americas Segment | Other Americas
Segment Reporting Information [Line Items]
Total property and equipment, net	353	787
Europe Middle East Africa Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	33,940	34,649
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 65,035	$ 69,651

Revenues for Groups of Similar

Revenues for Groups of Similar Services (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

[1]

Sep. 30, 2015

[2]

Jun. 30, 2015

[3]

Mar. 31, 2015

[4]

Dec. 31, 2014

[5]

Sep. 30, 2014

[6]

Jun. 30, 2014

[7]

Mar. 31, 2014

[8]

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Revenue from External Customer [Line Items]

Total revenue

$ 1,273,393

$ 1,225,673

$ 1,243,265

$ 1,225,970

$ 1,253,072

$ 1,148,140

$ 1,084,191

$ 1,132,730

$ 4,968,301

$ 4,618,133

$ 4,680,380

Search

Revenue from External Customer [Line Items]

Total revenue

2,084,139

1,792,861

1,741,791

Display

Revenue from External Customer [Line Items]

Total revenue

2,074,161

1,868,035

1,949,830

Other

Revenue from External Customer [Line Items]

Total revenue

810,001

957,237

988,759

United States

Revenue from External Customer [Line Items]

Total revenue

3,865,772

3,380,310

3,317,794

International

Revenue from External Customer [Line Items]

Total revenue

$ 1,102,529

$ 1,237,823

$ 1,362,586

[1]

Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.

[2]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.

[3]

Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.

[4]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.

[5]

Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.

[6]

Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.

[7]

Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.

[8]

Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Search Agreement with Micros122

Search Agreement with Microsoft Corporation - Additional Information (Detail) - USD ($) $ in Millions	May. 01, 2015	Apr. 15, 2015	Feb. 23, 2015	Dec. 09, 2010	Feb. 23, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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		93.00%	90.00%
Microsoft revenue share rate before deduction of affiliate site's share of revenue		7.00%
Term of search agreement with Microsoft, years					10 years
Percentage of revenue attributable to Search Agreement						35.00%	35.00%	31.00%
Revenue collected from Search Agreement						$ 0	$ 52
Uncollected Search Agreement revenue						$ 267	$ 330
Term of license of core search technology with Microsoft, years				10 years

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event $ in Millions	Feb. 02, 2016USD ($)Office
Subsequent Event [Line Items]
Expected workforce reduction, percentage	15.00%
Number of offices to be closed | Office	5
Minimum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	$ 64
Maximum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	78
Cash Charges | Minimum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	57
Cash Charges | Maximum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	69
Employee Severance | Cash Charges | Minimum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	40
Employee Severance | Cash Charges | Maximum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	48
Lease termination | Cash Charges | Minimum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	17
Lease termination | Cash Charges | Maximum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	21
Share Based Compensation | Non-cash Charges | Minimum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	6
Share Based Compensation | Non-cash Charges | Maximum
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	8
Impairment Losses | Non-cash Charges
Subsequent Event [Line Items]
Pre-tax restructuring charges expected to incur	$ 1

Valuation And Qualifying Accoun

Valuation And Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 39,799	$ 35,549	$ 32,635
Charged to Expenses		26,793	15,406	10,278
Write-Offs Net of, Recoveries		(9,089)	(11,156)	(7,364)
Balance at end of Year		57,503	39,799	35,549
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		23,853	36,690	51,503
Charged (Credited) to Expenses		7,150	(10,427)	(4,595)
Charged (Credited) to Other Accounts	[1]	(2,002)	(2,410)	(10,218)
Balance at end of Year		$ 29,001	$ 23,853	$ 36,690
[1]	Amounts not charged (credited) to expenses are charged (credited) to stockholders' equity, deferred tax assets (liabilities), or goodwill.

Selected Quarterly Financial125

Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014	[5]	Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Data [Line Items]
Revenue	$ 1,273,393		$ 1,225,673		$ 1,243,265		$ 1,225,970		$ 1,253,072		$ 1,148,140		$ 1,084,191		$ 1,132,730		$ 4,968,301	$ 4,618,133	$ 4,680,380
Total operating expenses	5,803,427		1,311,985		1,288,059		1,313,324		1,220,918		1,105,968		1,045,754		1,102,551		9,716,795	4,475,191	4,090,454
Income (loss) from operations	(4,530,034)		(86,312)		(44,794)		(87,354)		32,154		42,172		38,437		30,179		(4,748,494)	142,942	589,926
Other income (expense), net	(9,023)		(23,955)		(11,741)		(31,063)		87,550		10,308,931		(13,589)		(13,453)		(75,782)	10,369,439	43,357
(Provision) benefit for income taxes	13,985		93,208		(58,495)		40,900		(52,340)		(3,973,402)		(8,143)		(4,217)		89,598	(4,038,102)	(153,392)
Earnings in equity interests	92,845		95,195		95,841		99,690		101,917		398,692		255,852		301,402		383,571	1,057,863	896,675
Net income (loss) attributable to Yahoo! Inc.	$ (4,434,987)		$ 76,261		$ (21,554)		$ 21,198		$ 166,344		$ 6,774,102		$ 269,707		$ 311,578		$ (4,359,082)	$ 7,521,731	$ 1,366,281
Net income (loss) attributable to Yahoo! Inc. common stockholders per share-basic	$ (4.70)		$ 0.08		$ (0.02)		$ 0.02		$ 0.18		$ 6.82		$ 0.27		$ 0.31		$ (4.64)	$ 7.61	$ 1.30
Net income (loss) attributable to Yahoo! Inc. common stockholders per share - diluted	$ (4.70)		$ 0.08		$ (0.02)		$ 0.02		$ 0.17		$ 6.70		$ 0.26		$ 0.29		$ (4.64)	$ 7.45	$ 1.26
Shares used in per share calculation- basic	943,425		940,822		937,569		934,748		948,079		993,543		999,765		1,009,890		939,141	987,819	1,052,705
Shares used in per share calculation- diluted	943,425		946,934		937,569		947,976		962,626		1,007,693		1,014,692		1,031,420		939,141	1,004,108	1,070,811
[1]	Net loss attributable to Yahoo! Inc. for the quarter ended December 31, 2015 includes goodwill impairment charge of $4.5 billion, asset impairment charge of $2 million related to the originally developed content, intangible impairment charge of $15 million, and net restructuring charges of $7 million.
[2]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2015 includes, a loss of $13 million due to the decline in fair value of the Hortonworks warrants, asset impairment charge of $42 million related to the acquired and originally developed content, and net restructuring charges of $26 million.
[3]	Net loss attributable to Yahoo! Inc. for the quarter ended June 30, 2015 includes a gain on sale of patents of $9 million, a gain of $5 million due to the increase in fair value of the Hortonworks warrants, and net restructuring charges of $20 million.
[4]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2015 includes a gain on sale of patents of $2 million, a loss of $12 million due to the decline in fair value of the Hortonworks warrants, and net restructuring charges of $51 million.
[5]	Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2014 includes a gain on sale of patents of $35 million, a gain on Hortonworks warrants of $98 million, a goodwill impairment charge of $88 million, and net restructuring charges of $33 million.
[6]	Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2014 includes a gain from sale of Alibaba Group shares of $6.3 billion, net of tax and net restructuring charges of $8 million.
[7]	Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2014 includes a gain on sale of patents of $62 million and net restructuring charges of $53 million.
[8]	Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2014 includes net restructuring charges of $9 million.

Selected Quarterly Financial126

Selected Quarterly Financial Data (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Data [Line Items]
Restructuring charges (reversals), net	$ 7,000	$ 26,000	$ 20,000	$ 51,000	$ 33,000	$ 8,000	$ 53,000	$ 9,000	$ 104,019	$ 103,450	$ 3,766
Gain on sale of patents			9,000	2,000	35,000		$ 62,000		11,100	97,894	79,950
Goodwill impairment charge	4,460,837				88,414				4,460,837	88,414	$ 63,555
Gain (loss) on Hortonworks warrants					$ 98,000				(19,199)	$ 98,062
Asset impairment charge	2,000								44,381
Intangible impairment charge	$ 15,423								$ 15,423
Hortonworks, Inc
Selected Quarterly Financial Data [Line Items]
Gain (Loss) in fair value of warrants		(13,000)	$ 5,000	$ (12,000)
Acquired and Originally Developed Content
Selected Quarterly Financial Data [Line Items]
Asset impairment charge		$ 42,000
Alibaba Group
Selected Quarterly Financial Data [Line Items]
Gain on sale of Alibaba Group shares, net of tax						$ 6,300,000