Altaba (AABA) 10-Q 9 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 28, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	YHOO
Entity Registrant Name	YAHOO INC
Entity Central Index Key	1,011,006
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		958,198,997

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,328,913	$ 1,119,469
Short-term marketable securities	5,582,149	5,700,925
Accounts receivable, net	940,311	1,084,267
Prepaid expenses and other current assets	176,351	221,499
Total current assets	8,027,724	8,126,160
Long-term marketable securities	1,110,166	1,089,707
Property and equipment, net	1,177,723	1,209,937
Goodwill	430,463	415,809
Intangible assets, net	142,424	161,644
Other long-term assets and investments	279,267	206,059
Investment in Alibaba Group	41,359,859	33,680,879
Investments in equity interests	2,841,100	3,192,884
Total assets	55,368,726	48,083,079
Current liabilities:
Accounts payable	180,368	171,520
Other accrued expenses and current liabilities	884,000	1,006,676
Deferred revenue	103,543	109,228
Total current liabilities	1,167,911	1,287,424
Convertible notes	1,317,112	1,299,945
Long-term deferred revenue	42,669	39,583
Other long-term liabilities	91,026	95,597
Deferred tax liabilities related to investment in Alibaba Group	16,762,865	13,633,988
Deferred and other long-term tax liabilities	519,950	642,466
Total liabilities	19,901,533	16,999,003
Commitments and contingencies (Note 11)
Yahoo! Inc. stockholders' equity:
Common stock, $0.001 par value; 5,000,000 shares authorized; 972,472 shares issued and 955,308 shares outstanding as of December 31, 2016 and 974,796 shares issued and 957,641 shares outstanding as of March 31, 2017	971	969
Additional paid-in capital	9,170,142	9,125,459
Treasury stock at cost, 17,164 shares as of December 31, 2016 and 17,155 shares as of March 31, 2017	(908,559)	(908,996)
Retained earnings	4,560,905	4,353,958
Accumulated other comprehensive income	22,612,258	18,477,893
Total Yahoo! Inc. stockholders' equity	35,435,717	31,049,283
Noncontrolling interests	31,476	34,793
Total equity	35,467,193	31,084,076
Total liabilities and equity	$ 55,368,726	$ 48,083,079

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2017	Dec. 31, 2016
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	974,796	972,472
Common stock, shares outstanding	957,641	955,308
Treasury stock at cost, shares	17,155	17,164

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue	$ 1,327,270	$ 1,087,152
Operating expenses:
Cost of revenue - traffic acquisition costs	493,502	227,763
Cost of revenue - other	256,774	282,587
Sales and marketing	209,366	236,033
Product development	252,220	278,029
General and administrative	156,837	155,451
Amortization of intangibles	11,506	18,773
Gain on sale of patents	0	(1,500)
Restructuring charges, net	5,812	57,230
Total operating expenses	1,386,017	1,254,366
Loss from operations	(58,747)	(167,214)
Other (expense) income, net	18,822	(47,416)
Loss before income taxes and earnings in equity interests	(39,925)	(214,630)
Benefit for income taxes	26,177	34,766
Earnings in equity interests, net of tax	113,688	81,574
Net (loss) income	99,940	(98,290)
Net income attributable to noncontrolling interests	(506)	(942)
Net (loss) income attributable to Yahoo! Inc.	$ 99,434	$ (99,232)
Net (loss) income attributable to Yahoo! Inc. common stockholders per share - basic	$ 0.10	$ (0.10)
Net (loss) income attributable to Yahoo! Inc. common stockholders per share - diluted	$ 0.10	$ (0.10)
Shares used in per share calculation - basic	955,859	945,719
Shares used in per share calculation - diluted	963,169	945,719
Stock-based compensation expense by function:
Stock-based compensation expense by function	$ 108,776	$ 108,407
Cost of revenue - other
Stock-based compensation expense by function:
Stock-based compensation expense by function	8,415	8,526
Sales and marketing
Stock-based compensation expense by function:
Stock-based compensation expense by function	31,409	32,887
Product development
Stock-based compensation expense by function:
Stock-based compensation expense by function	48,366	47,988
General and administrative
Stock-based compensation expense by function:
Stock-based compensation expense by function	20,586	19,006
Restructuring charges, net
Stock-based compensation expense by function:
Stock-based compensation expense by function	$ 0	$ 7,374

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net (loss) income	$ 99,940	$ (98,290)
Available-for-sale securities:
Unrealized (losses) gains on available-for-sale securities, net of taxes of $363,084 and $(3,153,593) for the three months ended March 31, 2016 and 2017, respectively	4,587,033	(516,536)
Reclassification adjustment for realized losses on available-for-sale securities included in net (loss) income, net of taxes of $(112) and $(89) for the three months ended March 31, 2016 and 2017, respectively	178	202
Net change in unrealized (losses) gains on available-for-sale securities, net of tax	4,587,211	(516,334)
Foreign currency translation adjustments ("CTA"):
Foreign CTA gains (losses), net of taxes of $(336) and $(102) for the three months ended March 31, 2016 and 2017, respectively	(446,721)	2,183
Net investment hedge CTA losses, net of taxes of $16,931 and $3,108 for the three months ended March 31, 2016 and 2017, respectively	(5,632)	(30,710)
Reclassification adjustment for realized gains included in CTA, net of taxes of nil for the three months ended March 31, 2017	(493)	0
Net foreign CTA losses, net of tax	(452,846)	(28,527)
Cash flow hedges:
Unrealized losses on cash flow hedges, net of taxes of $1,338 for the three months ended March 31, 2016	0	(2,426)
Reclassification adjustment for realized losses on cash flow hedges included in net (loss) income, net of taxes of $(277) for the three months ended March 31, 2016	0	501
Net change in unrealized losses on cash flow hedges, net of tax	0	(1,925)
Other comprehensive (loss) income	4,134,365	(546,786)
Comprehensive (loss) income	4,234,305	(645,076)
Less: comprehensive income attributable to noncontrolling interests	(506)	(942)
Comprehensive (loss) income attributable to Yahoo! Inc.	$ 4,233,799	$ (646,018)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Unrealized (losses) gains on available-for-sale securities, taxes	$ (3,153,593)	$ 363,084
Reclassification adjustment for realized losses on available-for-sale securities included in net (loss) income, taxes	(89)	(112)
Foreign CTA gains (losses), net of taxes	(102)	(336)
Net investment hedge CTA losses, taxes	3,108	16,931
Reclassification adjustment for realized gains included in CTA, taxes	$ 0
Unrealized losses on cash flow hedges, taxes		1,338
Reclassification adjustment for realized losses on cash flow hedges included in net (loss) income, taxes		$ (277)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ 99,940	$ (98,290)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	95,703	107,377
Amortization of intangible assets	19,396	32,288
Accretion of convertible notes discount	17,167	16,290
Stock-based compensation expense	108,776	115,781
Non-cash restructuring charges	0	362
Non-cash accretion on marketable securities	899	12,354
Foreign exchange gain	(12,546)	(6,524)
Gain on sale of assets and other	(9)	(190)
Gain on sale of patents	0	(1,500)
Loss (gain) on Hortonworks warrants	(5,385)	39,150
Earnings in equity interests	(113,688)	(81,574)
Tax benefits from stock-based awards	0	1,192
Excess tax benefits from stock-based awards	0	(7,526)
Deferred income taxes	(44,296)	(37,794)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	151,772	172,677
Prepaid expenses and other	24,281	232,783
Accounts payable	(5,099)	2,844
Accrued expenses and other liabilities	(118,622)	(142,308)
Deferred revenue	(3,834)	8,376
Net cash provided by operating activities	214,455	365,768
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(61,147)	(76,399)
Proceeds from sales of property and equipment	937	300
Purchases of marketable securities	(1,457,036)	(1,871,316)
Proceeds from sales of marketable securities	52,436	47,374
Proceeds from maturities of marketable securities	1,503,562	1,369,836
Proceeds from sales of patents	0	1,500
Purchases of intangible assets	(52)	(1,177)
Proceeds from settlement of derivative hedge contracts	8,223	36,028
Payments for settlement of derivative hedge contracts	(1,078)	(3,024)
Other investing activities, net	156	(58)
Net cash (used in) provided by investing activities	46,001	(496,936)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	3,095	4,754
Excess tax benefits from stock-based awards	0	7,526
Tax withholdings related to net share settlements of restricted stock awards and restricted stock units	(67,901)	(42,139)
Distributions to noncontrolling interests	(3,823)	0
Other financing activities, net	(3,126)	(3,637)
Net cash used in financing activities	(71,755)	(33,496)
Effect of exchange rate changes on cash and cash equivalents	20,743	12,357
Net change in cash and cash equivalents	209,444	(152,307)
Cash and cash equivalents at beginning of period	1,119,469	1,631,911
Cash and cash equivalents at end of period	1,328,913	1,479,604
NON-CASH ACTIVITIES:
Change in non-cash acquisitions of property and equipment	$ (1,564)	$ 6,333

The Company and Summary of Sign

The Company and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
The Company and Summary of Significant Accounting Policies	Note 1 The Company and Summary of Significant Accounting Policies The Company. Basis of Presentation. The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of only normal recurring items, which, in the opinion of management, are necessary for a fair statement of the results of operations for the periods shown. The results of operations for such periods are not necessarily indicative of the results expected for the full year or for any future periods. The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses and the related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, the useful lives of long-lived assets including property and equipment and intangible assets, investment fair values, 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. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed consolidated balance sheet as of December 31, 2016 was derived from the Company’s audited financial statements for the year ended December 31, 2016, but does not include all disclosures required by U.S. GAAP. However, the Company believes the disclosures are adequate to make the information presented not misleading. Revenue Recognition — Search Revenue and Cost of Revenue — TAC. TAC consists of payments made to Affiliates and payments made to companies that direct consumer and business traffic to Yahoo Properties. TAC is either recorded as a reduction to revenue or as cost of revenue — TAC. TAC related to the Microsoft Search Agreement was recorded as a reduction to revenue for reporting periods through March 31, 2016. Beginning in the second quarter of 2016, TAC related to the Microsoft Search Agreement is recorded as cost of revenue — TAC in markets that have completed the transition of exclusive sales responsibilities to Microsoft for paid search services to premium advertisers pursuant to the Eleventh Amendment as described above. The table below presents how the Company accounted for amounts paid to Affiliates related to the Microsoft Search Agreement in transitioned markets and shows the impact of the implementation of the Eleventh Amendment in transitioned markets (in thousands): Three Months Ended March 31, 2016 2017 Cost of revenue — TAC in transitioned markets (*) $ - $ 303,799 Reduction to revenue in transitioned markets $ 271,328 $ - (*) For the three months ended March 31, 2017, cost of revenue — TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment. See Note 16 — “Microsoft Search Agreement” for a description of the Search Agreement with Microsoft. Recent Accounting Pronouncements . 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 (loss) 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 (loss) as the Company’s marketable equity securities, primarily the Company’s investments in Alibaba Group Holding Limited (“Alibaba Group”), Hortonworks Inc. (“Hortonworks”), and Snap Inc. (“Snap”) 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 position, results of operations and cash flows and anticipates the new guidance will significantly impact its consolidated financial statements given the Company has a significant number of leases. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” as part of its simplification initiative, which involves several aspects of accounting for share-based payment transactions, including the income tax effects, statutory withholding requirements, forfeitures, and classification on the statement of cash flows. Under ASU 2016-09, stock based compensation excess benefits, net of detriments (if any) are now recorded to the condensed consolidated statements of operations. The ASU is effective for public companies for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The Company adopted this guidance as of January 1, 2017. The primary impact of adoption was the recognition of the cumulative tax benefits that were not previously recognized because the related tax deduction had not reduced taxes payable. As a result, the Company’s condensed consolidated balance sheet was adjusted on a modified retrospective basis as of the beginning of the period of adoption, resulting in an increase to retained earnings of approximately $108 million. Also, prospectively beginning January 1, 2017, excess tax benefits, net of detriments have been reflected as an income tax benefit/expense in the condensed consolidated statements of operations resulting in a $13 million tax benefit in the three months ended March 31, 2017. The Company’s adoption of this ASU also resulted in associated excess tax benefits being classified as an operating activity in the same manner as other cash flows related to income taxes in the statement of cash flows prospectively beginning January 1, 2017. Based on the adoption methodology applied, the statement of cash flows classification of prior periods has not been adjusted. The presentation requirements for cash flows related to employee taxes paid for withheld shares had no impact to any of the periods presented on the Company’s condensed consolidated cash flows statements since such cash flows have historically been presented as a financing activity. Additional amendments to the accounting for minimum statutory withholding tax requirements had no impact to the Company’s condensed consolidated financial statements. In addition, the Company did not change its accounting principles relative to elements of this standard and continued its existing practice of estimating the number of awards that will be forfeited. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses”, which introduces new guidance for credit losses on instruments within its scope. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including, but not limited to, trade and other receivables, held-to-maturity debt securities, loans and net investments in leases. The new guidance also modifies the impairment model for available-for-sale debt securities and requires the entities to determine whether all or a portion of the unrealized loss on an available-for-sale debt security is a credit loss. The standard also indicates that entities may not use the length of time a security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. The ASU is effective for public companies for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows. In June 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230), a consensus of the FASB’s Emerging Issues Task Force.” The new guidance is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The ASU is effective for public companies for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including interim periods within those fiscal years. An entity that elects early adoption must adopt all of the amendments in the same period. The guidance requires application using a retrospective transition method. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated cash flows. In October 2016, the FASB issued ASU 2016-16, “Income Taxes: Intra-Entity Transfers of Assets Other than Inventory” which amends the accounting for income taxes. The new guidance requires the recognition of the income tax consequences of an intra-entity asset transfer, other than transfers of inventory, when the transfer occurs. For intra-entity transfers of inventory, the income tax effects will continue to be deferred until the inventory has been sold to a third party. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. The new guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows. In November 2016, the FASB issued ASU No. 2016-18 “Statement of Cash Flows (Topic 230), Restricted Cash” which provides guidance on the presentation of restricted cash and restricted cash equivalents in the statements of cash flows. The new guidance requires restricted cash and restricted cash equivalents to be included within the cash and cash equivalents balances when reconciling the beginning-of-period and end-of-period amounts shown on the statements of cash flows. The ASU is effective for reporting periods beginning after December 15, 2017 with early adoption permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated cash flows. In January 2017, the FASB issued ASU No. 2017-04 “Intangibles — Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment,” which eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this ASU an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The ASU also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The ASU is effective for reporting periods beginning after December 15, 2019 with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows.

Marketable Securities, Investme

Marketable Securities, Investments and Fair Value Disclosures	3 Months Ended
	Mar. 31, 2017
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, 2016 Cost Gross Gross Estimated Government and agency securities $ 650,344 $ 43 $ (903) $ 649,484 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 6,144,991 812 (4,655) 6,141,148 Alibaba Group equity securities 2,713,484 30,967,395 - 33,680,879 Hortonworks equity securities 26,246 5,713 - 31,959 Other corporate equity securities 8,093 69 (3,057) ( *) 5,105 Total available-for-sale marketable securities $ 9,543,158 $ 30,974,032 $ (8,615) $ 40,508,575 (*) Relates to the other corporate equity securities in an unrealized loss position for less than 12 months. March 31, 2017 Cost Gross Gross Estimated Government and agency securities $ 532,678 $ 21 $ (980) $ 531,719 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 6,162,799 1,074 (3,277) 6,160,596 Alibaba Group equity securities 2,713,484 38,646,375 - 41,359,859 Hortonworks equity securities 26,246 11,481 - 37,727 Snap equity securities 50,000 53,749 - 103,749 Other corporate equity securities 8,150 - (3,042) (*) 5,108 Total available-for-sale marketable securities $ 9,493,357 $ 38,712,700 $ (7,299) $ 48,198,758 (*) Relates to the other corporate equity securities in an unrealized loss position for less than 12 months. December 31, March 31, 2017 Reported as: Short-term marketable securities $ 5,700,925 $ 5,582,149 Long-term marketable securities 1,089,707 1,110,166 Investment in Alibaba Group 33,680,879 41,359,859 Other long-term assets and investments 37,064 146,584 Total $ 40,508,575 $ 48,198,758 Short-term, highly liquid investments of $415 million and $632 million as of December 31, 2016 and March 31, 2017, respectively, included in cash and cash equivalents on the condensed consolidated balance sheets are not included in the table above as the gross unrealized gains and losses were immaterial as the carrying value approximates fair value because of the short maturity of those instruments. Realized gains and losses from sales of available-for-sale marketable debt securities were not material for both the three months ended March 31, 2016 and 2017. The remaining contractual maturities of available-for-sale marketable debt securities were as follows (in thousands): December 31, March 31, 2017 Due within one year $ 5,700,925 $ 5,582,149 Due after one year through five years 1,089,707 1,110,166 Total available-for-sale marketable debt securities $ 6,790,632 $ 6,692,315 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, 2016 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Government and agency securities $ 543,605 $ (903) $ - $ - $ 543,605 $ (903) Corporate debt securities, commercial paper, and bank certificates of deposit 2,355,935 (4,638) 46,438 (17) 2,402,373 (4,655) Total available-for-sale marketable debt securities $ 2,899,540 $ (5,541) $ 46,438 $ (17) $ 2,945,978 $ (5,558) March 31, 2017 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Government and agency securities $ 486,628 $ (980) $ - $ - $ 486,628 $ (980) Corporate debt securities, commercial paper, and bank certificates of deposit 2,380,497 (3,265) 32,038 (12) 2,412,535 (3,277) Total available-for-sale marketable debt securities $ 2,867,125 $ (4,245) $ 32,038 $ (12) $ 2,899,163 $ (4,257) The Company’s investment portfolio includes equity securities of Alibaba Group, Snap, Hortonworks and other corporate equity securities, 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 held 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 the various marketable securities changes. Investments in instruments that earn a fixed rate or a floating rate 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, 2016 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 375,286 $ - $ - $ 375,286 Available-for-sale marketable debt securities: Government and agency securities (1) - 649,484 - 649,484 Commercial paper and bank certificates of deposit (1) - 3,008,971 - 3,008,971 Corporate debt securities (1) - 3,132,177 - 3,132,177 Time deposits (1) - 39,598 - 39,598 Available-for-sale equity securities: Other corporate equity securities (2) 5,105 - - 5,105 Alibaba Group equity securities 33,680,879 - - 33,680,879 Hortonworks equity securities (2) 31,959 - - 31,959 Hortonworks warrants - - 28,815 28,815 Foreign currency derivative contracts (3) - 11,684 - 11,684 Financial assets at fair value $ 34,093,229 $ 6,841,914 $ 28,815 $ 40,963,958 Liabilities Foreign currency derivative contracts (3) - (9,333) - (9,333) Total financial assets and liabilities at fair value $ 34,093,229 $ 6,832,581 $ 28,815 $ 40,954,625 The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of March 31, 2017 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 533,768 $ - $ - $ 533,768 Available-for-sale marketable debt securities: Government and agency securities (1) - 531,719 - 531,719 Commercial paper and bank certificates of deposit (1) - 2,892,727 - 2,892,727 Corporate debt securities (1) - 3,313,247 - 3,313,247 Time deposits (1) - 52,605 - 52,605 Available-for-sale equity securities: Other corporate equity securities (2) 5,108 - - 5,108 Alibaba Group equity securities 41,359,859 - - 41,359,859 Snap equity securities (2) 51,875 51,874 - 103,749 Hortonworks equity securities (2) 37,727 - - 37,727 Hortonworks warrants - - 34,200 34,200 Foreign currency derivative contracts (3) - 1,327 - 1,327 Financial assets at fair value $ 41,988,337 $ 6,843,499 $ 34,200 $ 48,866,036 Liabilities Foreign currency derivative contracts (3) - (17,210) - (17,210) Total financial assets and liabilities at fair value $ 41,988,337 $ 6,826,289 $ 34,200 $ 48,848,826 (1) The money market funds, government and agency securities, commercial paper and bank certificates of deposit, corporate debt securities, and time deposits are classified as part of either cash and cash equivalents or short or long-term marketable securities on the condensed consolidated balance sheets. (2) Hortonworks, Snap and other corporate equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets. (3) Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the condensed consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were: $0.6 billion, including contracts designated as net investment hedges of $0.2 billion, as of December 31, 2016; and $0.4 billion, including contracts designated as net investment hedges of $0.2 billion, as of March 31, 2017. The amount of cash included in cash and cash equivalents as of December 31, 2016 and March 31, 2017 was $705 million and $697 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 year ended December 31, 2016 and the three months ended March 31, 2017, the Company did not make any transfers between Level 1, Level 2, and Level 3 assets or liabilities. Hortonworks Warrants The estimated fair value of the Hortonworks warrants was $29 million and $34 million as of December 31, 2016 and March 31, 2017, respectively, which is included in other long-term assets and investments on the condensed consolidated balance sheets. During the three months ended March 31, 2016 and 2017, the Company recorded a loss of $39 million and a gain of $5 million, respectively, due to the change in estimated fair value of the Hortonworks warrants during the respective periods, which was included within other (expense) income, net in the Company’s condensed consolidated statements of operations. The estimated fair value of the Hortonworks warrants was determined using a Black-Scholes model. Assets and Liabilities at Fair Value on a Nonrecurring Basis Convertible Senior Notes In 2013, the Company issued $1.4 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 both December 31, 2016 and March 31, 2017 was $1.3 billion. 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 10 — “Convertible Notes” for additional information related to the Notes. Other Investments As of December 31, 2016 and March 31, 2017, the Company held approximately $83 million and $33 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 condensed consolidated balance sheets. Such investments are reviewed periodically for impairment. In March 2017, Snap Inc. (“Snap”) completed its initial public offering (“IPO”) and its Class A common shares are now listed for trading on the New York Stock Exchange (“NYSE”). As a result, the Company’s investment in Snap, which consists of both Class A and Class B common shares, is no longer included in investments in equity securities of privately-held companies that are accounted for using the cost method. Commencing with Snap’s IPO, the Company reflects its investment in Snap as an available-for-sale equity security on the condensed consolidated balance sheet and adjusts the investment to fair value each quarterly reporting period with changes in fair value recorded within other comprehensive (loss) income, net of tax. The Company obtains the fair value of its investment in Class B common shares using the quoted prices of Snap’s Class A common shares on the NYSE since the shares are convertible into Class A common shares. Accordingly, the investment balance in Class B common shares is classified as a Level 2 fair value measurement in the fair value hierarchy as the Company is using the quoted prices for similar assets in active markets to calculate the fair value of its investment in Class B common shares of Snap.

Consolidated Financial Statemen

Consolidated Financial Statement Details	3 Months Ended
	Mar. 31, 2017
Consolidated Financial Statement Details	Note 3 Consolidated Financial Statement Details Accumulated Other Comprehensive Income The components of accumulated other comprehensive income were as follows (in thousands): December 31, March 31, 2017 Unrealized gains on available-for-sale securities, net of tax $ 18,376,965 $ 22,964,176 Unrealized losses on cash flow hedges, net of tax (19) (19) Foreign currency translation adjustments, net of tax 100,947 (351,899) Accumulated other comprehensive income $ 18,477,893 $ 22,612,258 Noncontrolling Interests Noncontrolling interests were as follows (in thousands): March 31, 2016 March 31, 2017 Beginning noncontrolling interests $ 35,883 $ 34,793 Distributions to noncontrolling interests - (3,823) Net income attributable to noncontrolling interests 942 506 Ending noncontrolling interests $ 36,825 $ 31,476 Other (Expense) Income, Net Other (expense) income, net was as follows (in thousands): Three Months Ended March 31, 2016 2017 Interest and investment income $ 11,482 $ 20,582 Interest expense (18,393) (18,844) (Loss) gain on Hortonworks warrants (39,150) 5,385 Foreign exchange (loss) gain (2,138) 9,702 Other 783 1,997 Total other (expense) income, net $ (47,416) $ 18,822 Interest and investment income consists of income earned from cash and cash equivalents in bank accounts and investments made in marketable debt securities. Interest expense is related to the Notes and notes payable related to building and capital lease obligations for data centers. During the three months ended March 31, 2016 and 2017, the Company recorded a loss of $39 million and a gain of $5 million, respectively, due to the change in estimated fair value of the Hortonworks warrants during the respective periods. Changes in the estimated fair value of the Hortonworks warrants are recorded within other (expense) income, net in the Company’s condensed consolidated statements of operations. See Note 2 — “Marketable Securities, Investments and Fair Value Disclosures” for additional information. Foreign exchange (loss) gain 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 three months ended March 31, 2016 were as follows (in thousands): Amount Affected Line Item in the Realized losses on cash flow hedges, net of tax $ 501 Revenue Realized losses on available-for-sale securities, net of tax 202 Other (expense) income, net Total reclassifications for the period $ 703 Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2017 were as follows (in thousands): Amount Affected Line Item in the Realized losses on available-for-sale securities, net of tax $ 178 Other (expense) income, net Realized gains on foreign currency translation adjustments (“CTA”): Liquidation of foreign subsidiary CTA reclassification (493) Other (expense) income, net Total reclassifications for the period $ (315)

Acquisitions and Dispositions

Acquisitions and Dispositions	3 Months Ended
	Mar. 31, 2017
Acquisitions and Dispositions	Note 4 Acquisitions and Dispositions The Company did not make any acquisitions during the three months ended March 31, 2016 or 2017. 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 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 $22 million in revenue related to the Existing Patents and the Capture Period Patents during both the three months ended March 31, 2016 and 2017. The Company sold certain patents and recorded gains on sales of patents of approximately $2 million for the three months ended March 31, 2016. Pending Sale of the Operating Business to Verizon Communications Inc. On July 23, 2016, the Company entered into a Stock Purchase Agreement (the “Original Stock Purchase Agreement”) with Verizon Communications Inc. (“Verizon”), pursuant to which the Company has agreed to sell, and Verizon has agreed to purchase (the “Sale Transaction”), all of the outstanding shares of Yahoo Holdings, Inc., a newly formed wholly-owned subsidiary of the Company (“Yahoo Holdings”) (and prior to the sale of Yahoo Holdings to cause Yahoo Holdings to sell to a foreign subsidiary of Verizon all of the equity interests in a foreign subsidiary of Yahoo Holdings that will hold certain foreign subsidiaries relating to the Company’s operating business), which, immediately prior to the consummation of the Sale Transaction, will own the Company’s operating business. Under the Original Stock Purchase Agreement, the aggregate consideration to be paid to the Company by Verizon in connection with the Sale Transaction was $4,825,800,000 in cash, subject to certain adjustments as provided in the Original Stock Purchase Agreement. Concurrently with the execution of the Original Stock Purchase Agreement, the Company entered into a Reorganization Agreement (the “Original Reorganization Agreement”) with Yahoo Holdings, pursuant to which the Company will transfer to Yahoo Holdings prior to the consummation of the Sale Transaction all of its assets and liabilities relating to its operating business, other than specified excluded assets and retained liabilities (the “Reorganization”). On February 20, 2017, the Company and Verizon entered into an Amendment to the Stock Purchase Agreement amending the Original Stock Purchase Agreement (the “SPA Amendment” and, together with the Original Stock Purchase Agreement, the “Amended Stock Purchase Agreement”), and, concurrently with the execution of the SPA Amendment, the Company and Yahoo Holdings entered into an Amendment to the Reorganization Agreement amending the Original Reorganization Agreement (the “RA Amendment”). Additionally, concurrently with the execution of the SPA Amendment and the RA Amendment, the Company, Yahoo Holdings, and Verizon entered into a Settlement and Release Agreement (the “Settlement and Release Agreement”). The SPA Amendment, among other things, (i) reduced the consideration to be paid by Verizon to the Company in connection with the Sale Transaction by $350,000,000 to $4,475,800,000, (ii) provided that certain data security incidents to which the Company has been subject will be disregarded for purposes of determining whether certain closing conditions have been satisfied and in determining whether a “Business Material Adverse Effect” has occurred, and (iii) provided that the date after which each of Yahoo and Verizon may terminate the Amended Stock Purchase Agreement if the Closing (as defined in the Amended Stock Purchase Agreement) has not occurred has been extended to July 24, 2017. The RA Amendment provides, among other things, that the Company and Verizon will each be responsible for 50 percent of certain post-closing cash liabilities related to certain data security incidents and other data breaches incurred by the Company. Under the terms of the Settlement and Release Agreement, among other things, Verizon released certain claims, subject to certain exceptions, it (and its affiliates and representatives) may have against the Company (or its affiliates and representatives) relating to certain data security incidents and other data breaches incurred by the Company. Upon completion of the Sale Transaction, Verizon will also receive for its benefit and that of its current and certain of its future affiliates, a non-exclusive, worldwide, perpetual, royalty-free license to certain intellectual property not core to the operating business held by Excalibur IP, LLC, a wholly-owned subsidiary of the Company (“Excalibur”), that is not being transferred to Yahoo Holdings with the operating business. The excluded assets include the Company’s cash and marketable securities as of the closing of the Sale Transaction, the Company’s shares in Alibaba Group and Yahoo Japan, certain other minority equity investments, and all of the equity in Excalibur. The retained liabilities will include the Notes, securityholder litigation, certain director and officer indemnification obligations, and, pursuant to the RA Amendment, 50 percent of certain post-closing cash liabilities related to certain data security incidents and other data breaches incurred by the Company. Following the closing of the Sale Transaction, the excluded assets and retained liabilities will remain in the Company which will be renamed Altaba Inc. and will become an independent, publicly traded, management investment company registered under the Investment Company Act of 1940. The closing of the Sale Transaction is subject to certain conditions, including, among others, the approval of the Sale Transaction by the Company’s stockholders, the closing of the Reorganization, and certain other customary closing conditions. The special meeting of the Company’s stockholders at which they will vote whether to approve the Sale Transaction has been scheduled for June 8, 2017.

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2017
Goodwill	Note 5 Goodwill The changes in the carrying amount of goodwill for the three months ended March 31, 2017 were as follows (in thousands): Americas (1) EMEA (2) Asia Pacific (3) Total Net balance as of January 1, 2017 $ 123,985 $ - $ 291,824 $ 415,809 Foreign currency translation adjustments - - 14,654 14,654 Net balance as of March 31, 2017 $ 123,985 $ - $ 306,478 $ 430,463 (1) Gross goodwill balance for the Americas segment was $4.4 billion as of March 31, 2017. The Americas segment includes accumulated impairment losses of $4.3 billion as of March 31, 2017. (2) Gross goodwill balance for the EMEA segment was $1.2 billion as of March 31, 2017. The EMEA segment includes accumulated impairment losses of $1.2 billion as of March 31, 2017. (3) Gross goodwill balance for the Asia Pacific segment was $465 million as of March 31, 2017. The Asia Pacific segment includes accumulated impairment losses of $159 million as of March 31, 2017. Given the partial impairment recorded in the Tumblr reporting unit in 2016, 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.

Intangible Assets, Net

Intangible Assets, Net	3 Months Ended
	Mar. 31, 2017
Intangible Assets, Net	Note 6 Intangible Assets, Net The following table summarizes the Company’s intangible assets, net (in thousands): December 31, 2016 March 31, 2017 Gross Carrying Accumulated Net Net Amount Amortization (*) Customer, affiliate, and advertiser related relationships $ 102,765 $ 349,293 $ (256,826) $ 92,467 Developed technology and patents 47,243 122,182 (82,588) 39,594 Tradenames, trademarks, and domain names 11,636 66,631 (56,268) 10,363 Total intangible assets, net $ 161,644 $ 538,106 $ (395,682) $ 142,424 (*) Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million as of March 31, 2017. For the three months ended March 31, 2016 and 2017, the Company recognized amortization expense for intangible assets of $32 million and $19 million, respectively, including $14 million and $8 million in cost of revenue — other for the three months ended March 31, 2016 and 2017, respectively. Based on the current amount of intangibles subject to amortization, the estimated amortization expense for the remainder of 2017 and each of the succeeding years is as follows: nine months ending December 31, 2017: $56 million; 2018: $55 million; 2019: $30 million; 2020: $1 million; 2021 and cumulatively thereafter: less than $1 million.

Basic and Diluted Net (Loss) In

Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. Common Stockholders per Share	3 Months Ended
	Mar. 31, 2017
Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. Common Stockholders per Share	Note 7 Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. Common Stockholders per Share Basic and diluted net (loss) income attributable to Yahoo! Inc. common stockholders per share is computed using the weighted average number of common shares outstanding during the period, excluding net income attributable to participating securities (restricted stock units granted under the Directors’ Stock Plan (the “Directors’ Plan”)). Diluted net (loss) income per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares are calculated using the treasury stock method and consist of unvested restricted stock and the incremental common shares issuable upon the exercise of stock options. As a result of the adoption of ASU 2016-09, the excess tax benefit from stock-based awards is no longer included in the calculation of diluted shares under the treasury stock method. This has been applied prospectively. The Company takes into account the effect on consolidated net (loss) income per share of dilutive securities of entities in which the Company holds equity interests that are accounted for using the equity method. For the three months ended March 31, 2017, potentially dilutive securities representing approximately 2 million shares of common stock 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 (loss) income per share also does not include any effect from the note hedges. In future periods, the denominator for diluted net (loss) income per share will exclude any effect of the note hedges, if their effect would be anti-dilutive. In the event an actual conversion of any or all of the Notes occurs, the shares that would be delivered to the Company under the note hedges are designed to neutralize the dilutive effect of the shares that the Company would issue under the Notes. See Note 10 — “Convertible Notes” for additional information. The following table sets forth the computation of basic and diluted net (loss) income per share (in thousands, except per share amounts): Three Months Ended March 31, 2016 2017 Basic: Numerator: Net (loss) income attributable to Yahoo! Inc. $ (99,232) $ 99,434 Net (loss) income attributable to Yahoo! Inc. common stockholders — basic $ (99,232) $ 99,434 Denominator: Weighted average common shares 945,719 955,859 Net (loss) income attributable to Yahoo! Inc. common stockholders per share — basic $ (0.10) $ 0.10 Diluted: Numerator: Net (loss) income attributable to Yahoo! Inc. $ (99,232) $ 99,434 Less: Net income attributable to participating securities - (1) Less: Effect of dilutive securities issued by equity investees - (1,256) Net (loss) income attributable to Yahoo! Inc. common stockholders — diluted $ (99,232) $ 98,177 Denominator: Denominator for basic calculation 945,719 955,859 Weighted average effect of Yahoo! Inc. dilutive securities: Restricted stock units - 4,810 Stock options - 2,500 Denominator for diluted calculation 945,719 963,169 Net (loss) income attributable to Yahoo! Inc. common stockholders per share — diluted $ (0.10) $ 0.10

Investments in Equity Interests

Investments in Equity Interests Accounted for Using the Equity Method of Accounting	3 Months Ended
	Mar. 31, 2017
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 (dollars in thousands): December 31, 2016 Percent March 31, 2017 Percent Yahoo Japan $ 3,192,884 35.5% $ 2,841,100 35.5 % Equity Investment in Yahoo 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 condensed consolidated balance sheets. The Company records its share of the results of Yahoo Japan, and any related amortization expense, one quarter in arrears within earnings in equity interests in the condensed consolidated statements of operations. The Company makes adjustments to the earnings in equity interests line in the condensed 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 $9.3 billion as of March 31, 2017. 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 summarized 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’s summarized financial information presented below: Three Months Ended December 31, 2015 2016 (In thousands) Operating data: Revenue $ 958,861 $ 1,232,624 Gross profit $ 754,739 $ 959,969 Income from operations $ 344,951 $ 450,513 Net income $ 234,514 $ 320,141 Net income attributable to Yahoo Japan $ 234,663 $ 321,283 September 30, December 31, 2016 2016 (In thousands) Balance sheet data: Current assets $ 7,155,657 $ 6,749,240 Long-term assets $ 4,332,498 $ 3,823,752 Current liabilities $ 2,866,924 $ 2,878,140 Long-term liabilities $ 435,253 $ 380,635 Noncontrolling interests $ 209,363 $ 176,597 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 $62 million and $66 million for the three months ended March 31, 2016 and 2017, respectively. As of both December 31, 2016 and March 31, 2017, the Company had net receivable balances from Yahoo Japan of approximately $46 million.

Foreign Currency Derivative Fin

Foreign Currency Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2017
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 condensed consolidated balance sheets at fair value, with assets included in prepaid expenses and other current assets or other long-term assets, and liabilities included in accrued expenses and other current liabilities or other long-term liabilities. The Company’s accounting treatment for these instruments is based on whether or not the instruments are designated as a hedging instrument. The effective portions of net investment hedges are recorded in other comprehensive (loss) income as a part of the cumulative translation adjustment. The effective portions of cash flow hedges are recorded in accumulated other comprehensive income until the hedged item is recognized in revenue on the condensed consolidated statements of operations when the underlying hedged revenue is recognized. Any ineffective portions of net investment hedges and cash flow hedges are recorded in other (expense) income, net on the Company’s condensed consolidated statements of operations. For balance sheet hedges, changes in the fair value are recorded in other (expense) income, net on the Company’s condensed 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 condensed 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, 2016 and March 31, 2017 were as follows (in millions): December 31, March 31, 2016 2017 Derivatives designated as hedging instruments: Net investment hedge forward and option contracts $ 200 $ 200 Cash flow hedge forwards $ 19 $ 25 Derivatives not designated as hedging instruments: Balance sheet hedges $ 342 $ 195 Foreign currency derivative activity for the three months ended March 31, 2016 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 74 $ (31) $ - $ (48) (*) $ - $ (5) Cash flow hedges $ 2 $ (1) $ - $ (3) $ (1) $ (3) Derivatives not designated as hedging instruments: Balance sheet hedges $ 2 $ (1) $ (2) $ - $ - $ (1) (*) This amount does not reflect the tax impact of $17 million recorded during the three months ended March 31, 2016. The $31 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets. Foreign currency derivative activity for the three months ended March 31, 2017 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ (9) $ - $ - $ (9) ( *) $ - $ (18) Cash flow hedges $ - $ - $ - $ - $ - $ - Derivatives not designated as hedging instruments: Balance sheet hedges $ 11 $ (7) $ (2) $ - $ - $ 2 (*) This amount does not reflect the tax impact of $3 million recorded during the three months ended March 31, 2017. The $6 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets. Foreign currency derivative contracts balance sheet location and ending fair value was as follows (in millions): Balance Sheet December 31, March 31, Location 2016 2017 Derivatives designated as hedging instruments: Net investment hedges Asset (1) $ - $ - Liability (2) $ (9 ) $ (18) Cash flow hedges Asset (1) $ - $ - Liability (2) $ - $ - Derivatives not designated as hedging instruments: Balance sheet hedges Asset (1) $ 12 $ 2 Liability (2) $ (1 ) $ - (1) Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets. (2) Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

Convertible Notes

Convertible Notes	3 Months Ended
	Mar. 31, 2017
Convertible Notes	Note 10 Convertible Notes 0.00% Convertible Senior Notes As of March 31, 2017, the Company had $1.4 billion in principal amount of Notes outstanding. The Notes are senior unsecured obligations of Yahoo, the Notes do not bear regular interest, and the principal amount of the Notes was issued at par value. The Notes mature on December 1, 2018, unless previously purchased or converted in accordance with their terms prior to such date. The Company may not redeem the Notes prior to maturity. However, holders of the Notes may convert them at certain times and upon the occurrence of certain events in the future, as outlined in the indenture governing the Notes (the “Indenture”). Holders of the Notes who convert in connection with a “make-whole fundamental change,” as defined in the Indenture, may require Yahoo to purchase for cash all or any portion of their Notes at a purchase price equal to 100 percent of the principal amount, plus accrued and unpaid special interest as defined in the Indenture, if any. The Notes are convertible, subject to certain conditions, into shares of Yahoo common stock at an initial conversion rate of 18.7161 shares per $1,000 principal amount of Notes (which is equivalent to an initial conversion price of approximately $53.43 per share), subject to adjustment upon the occurrence of certain events. Upon conversion of the Notes, holders will receive cash, shares of Yahoo’s common stock or a combination thereof, at Yahoo’s election. The Company’s intent is to settle the principal amount of the Notes in cash upon conversion. If the conversion value exceeds the principal amount, the Company would deliver shares of its common stock with respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread). As of March 31, 2017, none of the conditions allowing holders of the Notes to convert had been met. The Notes consist of the following (in thousands): December 31, March 31, 2016 2017 Liability component: Principal $ 1,437,500 $ 1,437,500 Less: note discount (137,555) (120,388) Net carrying amount $ 1,299,945 $ 1,317,112 Equity component (*) $ 305,569 $ 305,569 (*) Recorded on the condensed consolidated balance sheets within additional paid-in capital. The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended 2016 2017 Accretion of convertible note discount $ 16,290 $ 17,167 The fair value of the Notes, which was determined based on inputs that are observable in the market (Level 2), and the carrying value of debt instruments (carrying value excludes the equity component of the Notes classified in equity) were as follows (in thousands): December 31, 2016 March 31, 2017 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 1,314,876 $ 1,299,945 $ 1,329,882 $ 1,317,112

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies	Note 11 Commitments and Contingencies Lease Commitments Gross Operating Commitments Sublease Net Operating Commitments Nine months ending December 31, 2017 $ 77 $ (11) $ 66 Years ending December 31, 2018 76 (12) 64 2019 62 (9) 53 2020 48 (7) 41 2021 38 (6) 32 2022 27 (2) 25 Due after 5 years 60 - 60 Total gross and net lease commitments $ 388 $ (47) $ 341 Capital Lease Commitments Nine months ending December 31, 2017 $ 8 Years ending December 31, 2018 9 2019 5 2020 - 2021 - 2022 - Due after 5 years 3 Gross capital lease commitments $ 25 Less: interest 4 Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities $ 21 Affiliate Commitments . Non-cancelable Obligations . Intellectual Property Rights . Note Payable Obligations. Standby Letters of Credit. Other Commitments . As of March 31, 2017, 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 Patent Matters. Stockholder and Securities Matters. 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. On January 24, 2017, a stockholder action captioned Madrack v. Yahoo! Inc., et al. Talukder v. Yahoo! Inc., et al. On February 9, 2017, a stockholder derivative action captioned The LR Trust, et al. v. Marissa Mayer, et al. On February 16, 2017, a stockholder derivative action captioned Summer v. Marissa Mayer, et al. Bowser v. Marissa Mayer, et al. On February 20, 2017, a stockholder derivative action captioned Oklahoma Firefighters Pension and Retirement System v. Eric Brandt, et al. Spain Westgaard On March 7, 2017, a stockholder derivative and class action captioned Spain v. Marissa Mayer, et al. Westgaard v. Marissa Mayer, et al. TCPA Litigation Concerning Yahoo Messenge . General. 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, would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Amounts accrued as of March 31, 2017 were not material. 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. Security Incidents Contingencies On September 22, 2016, the Company disclosed that a copy of certain user account information for approximately 500 million user accounts was stolen from Yahoo’s network in late 2014 (the “2014 Security Incident”). On December 14, 2016, the Company disclosed that, based on its outside forensic expert’s analysis of data files provided to the Company in November 2016 by law enforcement, the Company believes an unauthorized third party stole data associated with more than one billion user accounts in August 2013 (the “2013 Security Incident”). In November and December 2016, the Company disclosed that based on an investigation by its outside forensic experts, it believes an unauthorized third party accessed the Company’s proprietary code to learn how to forge certain cookies. The outside forensic experts have identified approximately 32 million user accounts for which they believe forged cookies were used or taken in 2015 and 2016 (the “Cookie Forging Activity”). The 2013 Security Incident, the 2014 Security Incident, and the Cookie Forging Activity are collectively referred to herein as the “Security Incidents.” To date, approximately 43 putative consumer class action lawsuits have been filed against the Company in U.S. federal and state courts, and in foreign courts, relating to the Security Incidents, two of which were voluntarily dismissed. The plaintiffs, who purport to represent various classes of users, generally claim to have been harmed by the Company’s alleged actions and/or omissions in connection with the Security Incidents and assert a variety of common law and statutory claims seeking monetary damages or other related relief. In addition, as described above, two putative stockholder class actions have been filed against Yahoo, and certain officers of Yahoo, on behalf of persons who purchased or otherwise acquired the Company’s stock between November 12, 2013 and December 14, 2016, two additional putative class actions have been filed against certain current and former directors and officers of Yahoo on behalf of current shareholders of Yahoo, and six stockholder derivative actions have been filed purportedly on behalf of Yahoo against certain of its current and former directors and officers, each asserting claims related to the Security Incidents. Additional lawsuits and claims related to the Security Incidents may be asserted by or on behalf of users, partners, shareholders, or others seeking damages or other related relief. While a loss from these matters is reasonably possible, the Company cannot reasonably estimate a range of possible losses related to these legal proceedings at this time because the legal proceedings remain in the early stages, alleged damages have not been specified, there is uncertainty as to the likelihood of a class or classes being certified or the ultimate size of any class if certified, and there are significant factual and legal issues to be resolved. Based on current information, the Company does not believe that a loss from these matters is probable and therefore has not recorded an accrual for litigation or other contingencies relating to the Security Incidents. The Company will continue to evaluate information as it becomes known and will record an accrual for estimated losses at the time or times it is determined that a loss is both probable and reasonably estimable.

Stockholders' Equity and Employ

Stockholders' Equity and Employee Benefits	3 Months Ended
	Mar. 31, 2017
Stockholders' Equity and Employee Benefits	Note 12 Stockholders’ Equity and Employee Benefits Stock Options . Shares Weighted Average Outstanding at December 31, 2016 4,494 $ 20.04 Options exercised (1) (226) $ 13.68 Options expired (7) $ 27.63 Options cancelled/forfeited (4) $ 14.88 Outstanding at March 31, 2017 4,257 $ 20.37 (1) The Company generally issues new shares to satisfy stock option exercises. As of March 31, 2017, there was $3 million of unamortized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted average period of 1.2 years. Restricted Stock and Restricted Stock Units. Shares Weighted Average Fair Value Per Share Awarded and unvested at December 31, 2016 (1) 22,250 $ 41.40 Granted (2) 6,793 $ 45.70 Vested (3,635) $ 34.94 Cancelled/forfeited (2,128) $ 37.85 Awarded and unvested at March 31, 2017 (1) 23,280 $ 43.99 (1) Includes the maximum number of shares issuable under the Company’s performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown. (2) Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the three months ended March 31, 2017 (including future-year tranches for which performance goals had not been set during the period); excludes tranches of previously granted performance-based restricted stock units for which performance goals were set during the three months ended March 31, 2017. As of March 31, 2017, there was $603 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 2.7 years. During the three months ended March 31, 2016 and 2017, 3.4 million shares and 3.6 million shares, respectively, that were subject to previously granted restricted stock units, vested. These vested restricted stock awards were net share settled. During the three months ended March 31, 2016 and 2017, the Company withheld 1.4 million shares and 1.5 million shares, respectively, based upon the Company’s closing stock price on the vesting date, to satisfy the Company’s tax withholding obligation relating to the employees’ minimum statutory obligation for the applicable income and other employment taxes. The Company then remitted cash to the appropriate taxing authorities. Total payments for the employees’ tax obligations to the relevant taxing authorities were $42 million and $68 million, respectively, for the three months ended March 31, 2016 and 2017 and are reflected as a financing activity within the condensed consolidated statements of cash flows. The payments were used for tax withholdings related to the net share settlements of restricted stock units. The payments had the effect of share repurchases by the Company as they reduced the number of shares that would have otherwise been issued on the vesting date and were recorded as a reduction of additional paid-in capital. Performance RSUs. Stock Repurchases .

Restructuring Charges, Net

Restructuring Charges, Net	3 Months Ended
	Mar. 31, 2017
Restructuring Charges, Net	Note 13 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 three months ended March 31, 2016 and 2017, restructuring charges, net was comprised of the following (in thousands): Three Months Ended 2016 2017 Employee severance pay and related costs $ 44,796 $ 251 Non-cancelable lease, contract termination, and other charges 5,904 5,828 Reversals of previous charges (1,206) (267) Non-cash accelerations of stock-based compensation expense 7,374 - Other non-cash charges (credits), net 362 - Restructuring charges, net $ 57,230 $ 5,812 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. For the three months ended March 31, 2016, the Company recorded expense of $48 million, $7 million, and $2 million related to the Americas, EMEA, and Asia Pacific segments, respectively. For the three months ended March 31, 2017, the Company recorded expense of $5 million and approximately $1 million related to the Americas and EMEA segments, respectively. The Company’s restructuring accrual activity for the three months ended March 31, 2017 is summarized as follows (in thousands): Accrual balance as of December 31, 2016 $ 43,458 Restructuring charges 5,812 Cash paid (10,288) Foreign currency translation and other adjustments 157 Accrual balance as of March 31, 2017 $ 39,139 The $39 million restructuring liability as of March 31, 2017 consisted of $2 million for employee severance expenses, which the Company expects to pay out by the end of the second quarter of 2017, and $37 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. Restructuring accruals by segment consisted of the following (in thousands): December 31, March 31, 2017 Americas $ 38,041 $ 36,009 EMEA 5,263 2,799 Asia Pacific 154 331 Total restructuring accruals $ 43,458 $ 39,139

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Taxes	Note 14 Income Taxes The Company’s effective tax rate is the result of the mix of income earned and losses incurred in various tax jurisdictions that apply a broad range of income tax rates. Historically, the Company’s provision for income taxes has differed from the tax computed at the U.S. federal statutory income tax rate due to state taxes, the effect of non-U.S. operations, non-deductible stock-based compensation expense, non-deductible acquisition-related costs, and adjustments to unrecognized tax benefits. The Company recorded income tax benefits of $35 million and $26 million for the three months ended March 31, 2016 and 2017, respectively. The income tax benefits for both periods were primarily due to the Company’s loss before income taxes and earnings in equity interests. The tax benefit for the three months ended March 31, 2017 also included stock-based compensation benefits recognized resulting from the adoption of ASU 2016-09. For implications of ASU 2016-09 adoption, see Note 1 – “The Company and Summary of Significant Accounting Policies” for additional information. As of December 31, 2016, the Company distributed most of the cumulative earnings in its wholly owned foreign subsidiaries. As of March 31, 2017, there is no cumulative taxable temporary difference with respect to these foreign subsidiaries and therefore no incremental U.S. taxes were accrued. As of March 31, 2017, the Company does not have a plan to repatriate approximately $3.4 billion of earnings related to its equity method investment in Yahoo Japan. If the Company’s foreign earnings were to be distributed to the U.S. 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 Company’s gross amount of unrecognized tax benefits as of March 31, 2017 was $1.1 billion, of which $0.8 billion is recorded on the condensed consolidated balance sheets. The gross unrecognized tax benefits as of March 31, 2017 decreased by less than $1 million from the recorded balance as of December 31, 2016. The Company is in various stages of examination and appeal in connection with its taxes both in the United States and in foreign jurisdictions. Those audits generally span tax years 2005 through 2015. As of March 31, 2017, the Company’s 2011 through 2015 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. The Company’s 2009 through 2010 California tax returns are currently under examination. The Company’s 2011 through 2015 tax years remain subject to examination by the California Franchise Tax Board for California tax purposes. 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 $9 million in the next twelve months. As of December 31, 2016 and March 31, 2017, the Company accrued deferred tax liabilities of $13.6 billion and $16.8 billion, respectively, 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. 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 American Depositary Shares in Alibaba Group’s initial public offering 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 United States 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 2012 and as of March 31, 2017 totals approximately $150 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.

Segments

Segments	3 Months Ended
	Mar. 31, 2017
Segments	Note 15 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 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): Three Months Ended March 31, 2016 2017 Revenue by segment (1) Americas $ 861,539 $ 1,083,458 EMEA 76,923 107,782 Asia Pacific 148,690 136,030 Total Revenue $ 1,087,152 $ 1,327,270 TAC by segment (1) Americas $ 204,871 $ 432,684 EMEA 12,509 51,914 Asia Pacific 10,383 8,904 Total TAC $ 227,763 $ 493,502 Revenue ex-TAC by segment: Americas $ 656,668 $ 650,774 EMEA 64,414 55,868 Asia Pacific 138,307 127,126 Total Revenue ex-TAC 859,389 833,768 Direct costs by segment (2) Americas 72,508 59,313 EMEA 20,609 12,702 Asia Pacific 44,648 47,688 Global operating costs (3) 585,036 543,125 Gain on sale of patents (1,500) - Depreciation and amortization 139,665 115,099 Stock-based compensation expense 108,407 108,776 Restructuring charges, net 57,230 5,812 Loss from operations $ (167,214) $ (58,747) (1) Commencing in the second quarter of 2016, TAC payments related to the Microsoft Search Agreement, which previously would have been recorded as a reduction to revenue, began to be recorded as cost of revenue — TAC due to a required change in revenue presentation. See Note 1 — “The Company and Summary of Significant Accounting Policies” and Note 16 — “Microsoft Search Agreement” for additional information. (2) Direct costs for each segment include certain cost of revenue — other and costs associated with the local sales teams. Prior to the second quarter of 2016, certain account management costs associated with Yahoo Properties were managed locally and included as direct costs for each segment. Prior period amounts have been revised to conform to the current presentation. (3) Global operating costs include product development, marketing, real estate workplace, general and administrative, account management costs, and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment. Beginning in the second quarter of 2016, certain account management costs associated with Yahoo Properties are managed globally and included as global costs. Prior period amounts have been revised to conform to the current presentation. Three Months Ended March 31, 2016 2017 Capital expenditures, net: Americas $ 64,344 $ 49,028 EMEA 4,870 4,852 Asia Pacific 6,885 6,330 Total capital expenditures, net $ 76,099 $ 60,210 December 31, March 31, 2017 Property and equipment, net: Americas: U.S. $ 1,120,124 $ 1,080,472 Other 3,086 3,000 Total Americas $ 1,123,210 $ 1,083,472 EMEA 28,360 30,115 Asia Pacific 58,367 64,136 Total property and equipment, net $ 1,209,937 $ 1,177,723 See Note 5 — “Goodwill” and Note 13 — “Restructuring Charges, Net” for additional information regarding segments. Enterprise Wide Disclosures The following table presents revenue for groups of similar services (in thousands): Three Months Ended March 31, 2016 2017 Search $ 491,881 $ 744,738 Display 463,019 455,882 Other 132,252 126,650 Total revenue $ 1,087,152 $ 1,327,270 Three Months Ended March 31, 2016 2017 Revenue: U.S. $ 840,799 $ 1,043,587 International 246,353 283,683 Total revenue $ 1,087,152 $ 1,327,270 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 for both the three months ended March 31, 2016 and 2017.

Microsoft Search Agreement

Microsoft Search Agreement	3 Months Ended
	Mar. 31, 2017
Microsoft Search Agreement	Note 16 Microsoft Search Agreement On December 4, 2009, the Company entered into the Microsoft Search Agreement. 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 Microsoft Search Agreement on a market-by-market basis. The term of the Microsoft Search Agreement is 10 years from its commencement date, February 23, 2010, subject to earlier termination as provided in the Microsoft Search Agreement. As of October 1, 2015, either the Company or Microsoft may terminate the Microsoft Search Agreement by delivering a written notice of termination to the other party. The Microsoft 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. On April 15, 2015, the Company and Microsoft entered into the Eleventh Amendment pursuant to which the terms of the Microsoft Search Agreement were amended. Previously under the Microsoft 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 is required to request paid search results from Microsoft for 51 percent of search queries originating from desktop computers accessing Yahoo Properties and Affiliate sites (the “Volume Commitment”) and will display only Microsoft’s paid search results on such search result pages. Prior to the Eleventh Amendment, the Company was entitled to receive a percentage of the revenue (the “Revenue Share Rate”) with respect to revenue generated from paid search results 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 Microsoft 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 Company is responsible for paying the Affiliate for the Affiliate site’s share of revenue. Previously under the Microsoft Search Agreement, Yahoo had sales exclusivity for both the Company’s and Microsoft’s premium advertisers. For reporting periods ended December 31, 2014 and 2015, and March 31, 2016, TAC related to the Company’s Microsoft Search Agreement was recorded as a reduction to revenue. Pursuant to the Eleventh Amendment, the Company completed the transition of its exclusive sales responsibilities to Microsoft for Microsoft’s paid search services to premium advertisers in the United States, Canada, and Europe on April 1, 2016 and in its remaining markets (other than Taiwan and Hong Kong) on June 1, 2016. Following the transition in each respective market, Yahoo is considered the principal in the sale of traffic to Microsoft and other customers. As a result, the amounts paid to Affiliates under the Microsoft Search Agreement in the transitioned markets are recorded as cost of revenue — TAC rather than as a reduction to GAAP revenue, resulting in GAAP revenue from the Microsoft Search Agreement being reported on a gross rather than net basis. Approximately 29 percent and 42 percent of the Company’s revenue for the three months ended March 31, 2016 and 2017, respectively, was attributable to the Microsoft Search Agreement. Commencing in the second quarter of 2016, TAC payments related to the Microsoft Search Agreement for transitioned markets, which previously would have been recorded as a reduction to revenue, began to be recorded as a cost of revenue due to a required change in revenue presentation. During the three months ended March 31, 2017, $304 million of GAAP revenue and cost of revenue — TAC was due to the change in revenue presentation. See Note 1 — “The Company and Summary of Significant Accounting Policies” for additional information on change in revenue presentation. The Company’s uncollected revenue share in connection with the Microsoft Search Agreement was $392 million and $364 million, which is included in accounts receivable, net, as of December 31, 2016 and March 31, 2017, respectively.

The Company and Summary of Si24

The Company and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Basis of Presentation	Basis of Presentation. The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of only normal recurring items, which, in the opinion of management, are necessary for a fair statement of the results of operations for the periods shown. The results of operations for such periods are not necessarily indicative of the results expected for the full year or for any future periods. The preparation of consolidated financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses and the related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, the useful lives of long-lived assets including property and equipment and intangible assets, investment fair values, 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. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed consolidated balance sheet as of December 31, 2016 was derived from the Company’s audited financial statements for the year ended December 31, 2016, but does not include all disclosures required by U.S. GAAP. However, the Company believes the disclosures are adequate to make the information presented not misleading.
Revenue Recognition - Search Revenue and Cost of Revenue - TAC	Revenue Recognition — Search Revenue and Cost of Revenue — TAC. TAC consists of payments made to Affiliates and payments made to companies that direct consumer and business traffic to Yahoo Properties. TAC is either recorded as a reduction to revenue or as cost of revenue — TAC. TAC related to the Microsoft Search Agreement was recorded as a reduction to revenue for reporting periods through March 31, 2016. Beginning in the second quarter of 2016, TAC related to the Microsoft Search Agreement is recorded as cost of revenue — TAC in markets that have completed the transition of exclusive sales responsibilities to Microsoft for paid search services to premium advertisers pursuant to the Eleventh Amendment as described above. The table below presents how the Company accounted for amounts paid to Affiliates related to the Microsoft Search Agreement in transitioned markets and shows the impact of the implementation of the Eleventh Amendment in transitioned markets (in thousands): Three Months Ended March 31, 2016 2017 Cost of revenue — TAC in transitioned markets (*) $ - $ 303,799 Reduction to revenue in transitioned markets $ 271,328 $ - (*) For the three months ended March 31, 2017, cost of revenue — TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment. See Note 16 — “Microsoft Search Agreement” for a description of the Search Agreement with Microsoft.
Recent Accounting Pronouncements	Recent Accounting Pronouncements . 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 (loss) 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 (loss) as the Company’s marketable equity securities, primarily the Company’s investments in Alibaba Group Holding Limited (“Alibaba Group”), Hortonworks Inc. (“Hortonworks”), and Snap Inc. (“Snap”) 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 position, results of operations and cash flows and anticipates the new guidance will significantly impact its consolidated financial statements given the Company has a significant number of leases. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting” as part of its simplification initiative, which involves several aspects of accounting for share-based payment transactions, including the income tax effects, statutory withholding requirements, forfeitures, and classification on the statement of cash flows. Under ASU 2016-09, stock based compensation excess benefits, net of detriments (if any) are now recorded to the condensed consolidated statements of operations. The ASU is effective for public companies for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The Company adopted this guidance as of January 1, 2017. The primary impact of adoption was the recognition of the cumulative tax benefits that were not previously recognized because the related tax deduction had not reduced taxes payable. As a result, the Company’s condensed consolidated balance sheet was adjusted on a modified retrospective basis as of the beginning of the period of adoption, resulting in an increase to retained earnings of approximately $108 million. Also, prospectively beginning January 1, 2017, excess tax benefits, net of detriments have been reflected as an income tax benefit/expense in the condensed consolidated statements of operations resulting in a $13 million tax benefit in the three months ended March 31, 2017. The Company’s adoption of this ASU also resulted in associated excess tax benefits being classified as an operating activity in the same manner as other cash flows related to income taxes in the statement of cash flows prospectively beginning January 1, 2017. Based on the adoption methodology applied, the statement of cash flows classification of prior periods has not been adjusted. The presentation requirements for cash flows related to employee taxes paid for withheld shares had no impact to any of the periods presented on the Company’s condensed consolidated cash flows statements since such cash flows have historically been presented as a financing activity. Additional amendments to the accounting for minimum statutory withholding tax requirements had no impact to the Company’s condensed consolidated financial statements. In addition, the Company did not change its accounting principles relative to elements of this standard and continued its existing practice of estimating the number of awards that will be forfeited. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses”, which introduces new guidance for credit losses on instruments within its scope. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including, but not limited to, trade and other receivables, held-to-maturity debt securities, loans and net investments in leases. The new guidance also modifies the impairment model for available-for-sale debt securities and requires the entities to determine whether all or a portion of the unrealized loss on an available-for-sale debt security is a credit loss. The standard also indicates that entities may not use the length of time a security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. The ASU is effective for public companies for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows. In June 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230), a consensus of the FASB’s Emerging Issues Task Force.” The new guidance is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The ASU is effective for public companies for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including interim periods within those fiscal years. An entity that elects early adoption must adopt all of the amendments in the same period. The guidance requires application using a retrospective transition method. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated cash flows. In October 2016, the FASB issued ASU 2016-16, “Income Taxes: Intra-Entity Transfers of Assets Other than Inventory” which amends the accounting for income taxes. The new guidance requires the recognition of the income tax consequences of an intra-entity asset transfer, other than transfers of inventory, when the transfer occurs. For intra-entity transfers of inventory, the income tax effects will continue to be deferred until the inventory has been sold to a third party. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted. The new guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows. In November 2016, the FASB issued ASU No. 2016-18 “Statement of Cash Flows (Topic 230), Restricted Cash” which provides guidance on the presentation of restricted cash and restricted cash equivalents in the statements of cash flows. The new guidance requires restricted cash and restricted cash equivalents to be included within the cash and cash equivalents balances when reconciling the beginning-of-period and end-of-period amounts shown on the statements of cash flows. The ASU is effective for reporting periods beginning after December 15, 2017 with early adoption permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated cash flows. In January 2017, the FASB issued ASU No. 2017-04 “Intangibles — Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment,” which eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this ASU an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The ASU also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The ASU is effective for reporting periods beginning after December 15, 2019 with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on the Company’s consolidated financial position, results of operations and cash flows.

The Company and Summary of Si25

The Company and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2017
Schedule of Amounts Paid to Affiliates	The table below presents how the Company accounted for amounts paid to Affiliates related to the Microsoft Search Agreement in transitioned markets and shows the impact of the implementation of the Eleventh Amendment in transitioned markets (in thousands): Three Months Ended March 31, 2016 2017 Cost of revenue — TAC in transitioned markets (*) $ - $ 303,799 Reduction to revenue in transitioned markets $ 271,328 $ - (*) For the three months ended March 31, 2017, cost of revenue—TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment.

Marketable Securities, Invest26

Marketable Securities, Investments and Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 2017
Schedule of Available for Sale Securities	The following tables summarize the available-for-sale securities (in thousands): December 31, 2016 Cost Gross Gross Estimated Government and agency securities $ 650,344 $ 43 $ (903) $ 649,484 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 6,144,991 812 (4,655) 6,141,148 Alibaba Group equity securities 2,713,484 30,967,395 - 33,680,879 Hortonworks equity securities 26,246 5,713 - 31,959 Other corporate equity securities 8,093 69 (3,057) ( *) 5,105 Total available-for-sale marketable securities $ 9,543,158 $ 30,974,032 $ (8,615) $ 40,508,575 (*) Relates to the other corporate equity securities in an unrealized loss position for less than 12 months. March 31, 2017 Cost Gross Gross Estimated Government and agency securities $ 532,678 $ 21 $ (980) $ 531,719 Corporate debt securities, commercial paper, time deposits, and bank certificates of deposit 6,162,799 1,074 (3,277) 6,160,596 Alibaba Group equity securities 2,713,484 38,646,375 - 41,359,859 Hortonworks equity securities 26,246 11,481 - 37,727 Snap equity securities 50,000 53,749 - 103,749 Other corporate equity securities 8,150 - (3,042) (*) 5,108 Total available-for-sale marketable securities $ 9,493,357 $ 38,712,700 $ (7,299) $ 48,198,758 (*) Relates to the other corporate equity securities in an unrealized loss position for less than 12 months.
Schedule of Available for Sale Securities by Balance Sheet Location	December 31, March 31, 2017 Reported as: Short-term marketable securities $ 5,700,925 $ 5,582,149 Long-term marketable securities 1,089,707 1,110,166 Investment in Alibaba Group 33,680,879 41,359,859 Other long-term assets and investments 37,064 146,584 Total $ 40,508,575 $ 48,198,758
Schedule of Available for Sale Marketable Debt Securities by Contractual Maturities	The remaining contractual maturities of available-for-sale marketable debt securities were as follows (in thousands): December 31, March 31, 2017 Due within one year $ 5,700,925 $ 5,582,149 Due after one year through five years 1,089,707 1,110,166 Total available-for-sale marketable debt securities $ 6,790,632 $ 6,692,315
Available for Sale Marketable Debt 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, 2016 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Government and agency securities $ 543,605 $ (903) $ - $ - $ 543,605 $ (903) Corporate debt securities, commercial paper, and bank certificates of deposit 2,355,935 (4,638) 46,438 (17) 2,402,373 (4,655) Total available-for-sale marketable debt securities $ 2,899,540 $ (5,541) $ 46,438 $ (17) $ 2,945,978 $ (5,558) March 31, 2017 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Government and agency securities $ 486,628 $ (980) $ - $ - $ 486,628 $ (980) Corporate debt securities, commercial paper, and bank certificates of deposit 2,380,497 (3,265) 32,038 (12) 2,412,535 (3,277) Total available-for-sale marketable debt securities $ 2,867,125 $ (4,245) $ 32,038 $ (12) $ 2,899,163 $ (4,257)
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, 2016 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 375,286 $ - $ - $ 375,286 Available-for-sale marketable debt securities: Government and agency securities (1) - 649,484 - 649,484 Commercial paper and bank certificates of deposit (1) - 3,008,971 - 3,008,971 Corporate debt securities (1) - 3,132,177 - 3,132,177 Time deposits (1) - 39,598 - 39,598 Available-for-sale equity securities: Other corporate equity securities (2) 5,105 - - 5,105 Alibaba Group equity securities 33,680,879 - - 33,680,879 Hortonworks equity securities (2) 31,959 - - 31,959 Hortonworks warrants - - 28,815 28,815 Foreign currency derivative contracts (3) - 11,684 - 11,684 Financial assets at fair value $ 34,093,229 $ 6,841,914 $ 28,815 $ 40,963,958 Liabilities Foreign currency derivative contracts (3) - (9,333) - (9,333) Total financial assets and liabilities at fair value $ 34,093,229 $ 6,832,581 $ 28,815 $ 40,954,625 The following table sets forth the financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of March 31, 2017 (in thousands): Fair Value Measurements at Reporting Date Using Assets Level 1 Level 2 Level 3 Total Money market funds (1) $ 533,768 $ - $ - $ 533,768 Available-for-sale marketable debt securities: Government and agency securities (1) - 531,719 - 531,719 Commercial paper and bank certificates of deposit (1) - 2,892,727 - 2,892,727 Corporate debt securities (1) - 3,313,247 - 3,313,247 Time deposits (1) - 52,605 - 52,605 Available-for-sale equity securities: Other corporate equity securities (2) 5,108 - - 5,108 Alibaba Group equity securities 41,359,859 - - 41,359,859 Snap equity securities (2) 51,875 51,874 - 103,749 Hortonworks equity securities (2) 37,727 - - 37,727 Hortonworks warrants - - 34,200 34,200 Foreign currency derivative contracts (3) - 1,327 - 1,327 Financial assets at fair value $ 41,988,337 $ 6,843,499 $ 34,200 $ 48,866,036 Liabilities Foreign currency derivative contracts (3) - (17,210) - (17,210) Total financial assets and liabilities at fair value $ 41,988,337 $ 6,826,289 $ 34,200 $ 48,848,826 (1) The money market funds, government and agency securities, commercial paper and bank certificates of deposit, corporate debt securities, and time deposits are classified as part of either cash and cash equivalents or short or long-term marketable securities on the condensed consolidated balance sheets. (2) Hortonworks, Snap and other corporate equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets. (3) Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the condensed consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were: $0.6 billion, including contracts designated as net investment hedges of $0.2 billion, as of December 31, 2016; and $0.4 billion, including contracts designated as net investment hedges of $0.2 billion, as of March 31, 2017.

Consolidated Financial Statem27

Consolidated Financial Statement Details (Tables)	3 Months Ended
	Mar. 31, 2017
Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income were as follows (in thousands): December 31, March 31, 2017 Unrealized gains on available-for-sale securities, net of tax $ 18,376,965 $ 22,964,176 Unrealized losses on cash flow hedges, net of tax (19) (19) Foreign currency translation adjustments, net of tax 100,947 (351,899) Accumulated other comprehensive income $ 18,477,893 $ 22,612,258
Noncontrolling Interests	Noncontrolling interests were as follows (in thousands): March 31, 2016 March 31, 2017 Beginning noncontrolling interests $ 35,883 $ 34,793 Distributions to noncontrolling interests - (3,823) Net income attributable to noncontrolling interests 942 506 Ending noncontrolling interests $ 36,825 $ 31,476
Other (Expense) Income, Net	Other (expense) income, net was as follows (in thousands): Three Months Ended March 31, 2016 2017 Interest and investment income $ 11,482 $ 20,582 Interest expense (18,393) (18,844) (Loss) gain on Hortonworks warrants (39,150) 5,385 Foreign exchange (loss) gain (2,138) 9,702 Other 783 1,997 Total other (expense) income, net $ (47,416) $ 18,822
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2016 were as follows (in thousands): Amount Affected Line Item in the Realized losses on cash flow hedges, net of tax $ 501 Revenue Realized losses on available-for-sale securities, net of tax 202 Other (expense) income, net Total reclassifications for the period $ 703 Reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2017 were as follows (in thousands): Amount Affected Line Item in the Realized losses on available-for-sale securities, net of tax $ 178 Other (expense) income, net Realized gains on foreign currency translation adjustments (“CTA”): Liquidation of foreign subsidiary CTA reclassification (493) Other (expense) income, net Total reclassifications for the period $ (315)

Goodwill (Tables)

Goodwill (Tables)	3 Months Ended
	Mar. 31, 2017
Schedule Of Goodwill	The changes in the carrying amount of goodwill for the three months ended March 31, 2017 were as follows (in thousands): Americas (1) EMEA (2) Asia Pacific (3) Total Net balance as of January 1, 2017 $ 123,985 $ - $ 291,824 $ 415,809 Foreign currency translation adjustments - - 14,654 14,654 Net balance as of March 31, 2017 $ 123,985 $ - $ 306,478 $ 430,463 (1) Gross goodwill balance for the Americas segment was $4.4 billion as of March 31, 2017. The Americas segment includes accumulated impairment losses of $4.3 billion as of March 31, 2017. (2) Gross goodwill balance for the EMEA segment was $1.2 billion as of March 31, 2017. The EMEA segment includes accumulated impairment losses of $1.2 billion as of March 31, 2017. (3) Gross goodwill balance for the Asia Pacific segment was $465 million as of March 31, 2017. The Asia Pacific segment includes accumulated impairment losses of $159 million as of March 31, 2017.

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2017
Intangible Assets, Net	The following table summarizes the Company’s intangible assets, net (in thousands): December 31, 2016 March 31, 2017 Gross Carrying Accumulated Net Net Amount Amortization (*) Customer, affiliate, and advertiser related relationships $ 102,765 $ 349,293 $ (256,826) $ 92,467 Developed technology and patents 47,243 122,182 (82,588) 39,594 Tradenames, trademarks, and domain names 11,636 66,631 (56,268) 10,363 Total intangible assets, net $ 161,644 $ 538,106 $ (395,682) $ 142,424 (*) Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million as of March 31, 2017.

Basic and Diluted Net (Loss) 30

Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. Common Stockholders per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Computation of Basic and Diluted Net (Loss) Income Per Share	The following table sets forth the computation of basic and diluted net (loss) income per share (in thousands, except per share amounts): Three Months Ended March 31, 2016 2017 Basic: Numerator: Net (loss) income attributable to Yahoo! Inc. $ (99,232) $ 99,434 Net (loss) income attributable to Yahoo! Inc. common stockholders — basic $ (99,232) $ 99,434 Denominator: Weighted average common shares 945,719 955,859 Net (loss) income attributable to Yahoo! Inc. common stockholders per share — basic $ (0.10) $ 0.10 Diluted: Numerator: Net (loss) income attributable to Yahoo! Inc. $ (99,232) $ 99,434 Less: Net income attributable to participating securities - (1) Less: Effect of dilutive securities issued by equity investees - (1,256) Net (loss) income attributable to Yahoo! Inc. common stockholders — diluted $ (99,232) $ 98,177 Denominator: Denominator for basic calculation 945,719 955,859 Weighted average effect of Yahoo! Inc. dilutive securities: Restricted stock units - 4,810 Stock options - 2,500 Denominator for diluted calculation 945,719 963,169 Net (loss) income attributable to Yahoo! Inc. common stockholders per share — diluted $ (0.10) $ 0.10

Investments in Equity Interes31

Investments in Equity Interests Accounted for Using the Equity Method of Accounting (Tables)	3 Months Ended
	Mar. 31, 2017
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 (dollars in thousands): December 31, 2016 Percent March 31, 2017 Percent Yahoo Japan $ 3,192,884 35.5% $ 2,841,100 35.5 %
Summarized 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 summarized 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’s summarized financial information presented below: Three Months Ended December 31, 2015 2016 (In thousands) Operating data: Revenue $ 958,861 $ 1,232,624 Gross profit $ 754,739 $ 959,969 Income from operations $ 344,951 $ 450,513 Net income $ 234,514 $ 320,141 Net income attributable to Yahoo Japan $ 234,663 $ 321,283 September 30, December 31, 2016 2016 (In thousands) Balance sheet data: Current assets $ 7,155,657 $ 6,749,240 Long-term assets $ 4,332,498 $ 3,823,752 Current liabilities $ 2,866,924 $ 2,878,140 Long-term liabilities $ 435,253 $ 380,635 Noncontrolling interests $ 209,363 $ 176,597

Foreign Currency Derivative F32

Foreign Currency Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
Notional Amounts of Company's Outstanding Derivative Contracts	Notional amounts of the Company’s outstanding derivative contracts as of December 31, 2016 and March 31, 2017 were as follows (in millions): December 31, March 31, 2016 2017 Derivatives designated as hedging instruments: Net investment hedge forward and option contracts $ 200 $ 200 Cash flow hedge forwards $ 19 $ 25 Derivatives not designated as hedging instruments: Balance sheet hedges $ 342 $ 195
Foreign Currency Derivative Activity	Foreign currency derivative activity for the three months ended March 31, 2016 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ 74 $ (31) $ - $ (48) (*) $ - $ (5) Cash flow hedges $ 2 $ (1) $ - $ (3) $ (1) $ (3) Derivatives not designated as hedging instruments: Balance sheet hedges $ 2 $ (1) $ (2) $ - $ - $ (1) (*) This amount does not reflect the tax impact of $17 million recorded during the three months ended March 31, 2016. The $31 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets. Foreign currency derivative activity for the three months ended March 31, 2017 was as follows (in millions): Beginning Settlement Gain (Loss) Gain (Loss) Gain Ending Fair Derivatives designated as hedging instruments: Net investment hedges $ (9) $ - $ - $ (9) ( *) $ - $ (18) Cash flow hedges $ - $ - $ - $ - $ - $ - Derivatives not designated as hedging instruments: Balance sheet hedges $ 11 $ (7) $ (2) $ - $ - $ 2 (*) This amount does not reflect the tax impact of $3 million recorded during the three months ended March 31, 2017. The $6 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company’s condensed consolidated balance sheets.
Foreign Currency Derivative Contracts Balance Sheet Location and Ending Fair Value	Foreign currency derivative contracts balance sheet location and ending fair value was as follows (in millions): Balance Sheet December 31, March 31, Location 2016 2017 Derivatives designated as hedging instruments: Net investment hedges Asset (1) $ - $ - Liability (2) $ (9 ) $ (18) Cash flow hedges Asset (1) $ - $ - Liability (2) $ - $ - Derivatives not designated as hedging instruments: Balance sheet hedges Asset (1) $ 12 $ 2 Liability (2) $ (1 ) $ - (1) Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets. (2) Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

Convertible Notes (Tables)

Convertible Notes (Tables)	3 Months Ended
	Mar. 31, 2017
Schedule of Notes	The Notes consist of the following (in thousands): December 31, March 31, 2016 2017 Liability component: Principal $ 1,437,500 $ 1,437,500 Less: note discount (137,555) (120,388) Net carrying amount $ 1,299,945 $ 1,317,112 Equity component (*) $ 305,569 $ 305,569 (*) Recorded on the condensed consolidated balance sheets within additional paid-in capital.
Interest Expense Recognized Related To Notes	The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended 2016 2017 Accretion of convertible note discount $ 16,290 $ 17,167
Fair Value and Carrying Value of Notes	The fair value of the Notes, which was determined based on inputs that are observable in the market (Level 2), and the carrying value of debt instruments (carrying value excludes the equity component of the Notes classified in equity) were as follows (in thousands): December 31, 2016 March 31, 2017 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 1,314,876 $ 1,299,945 $ 1,329,882 $ 1,317,112

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Lease Commitments	A summary of gross and net lease commitments as of March 31, 2017 was as follows (in millions): Gross Operating Commitments Sublease Net Operating Commitments Nine months ending December 31, 2017 $ 77 $ (11) $ 66 Years ending December 31, 2018 76 (12) 64 2019 62 (9) 53 2020 48 (7) 41 2021 38 (6) 32 2022 27 (2) 25 Due after 5 years 60 - 60 Total gross and net lease commitments $ 388 $ (47) $ 341
Capital Lease Commitment	Capital Lease Commitments Nine months ending December 31, 2017 $ 8 Years ending December 31, 2018 9 2019 5 2020 - 2021 - 2022 - Due after 5 years 3 Gross capital lease commitments $ 25 Less: interest 4 Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities $ 21

Stockholders' Equity and Empl35

Stockholders' Equity and Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Schedule of Stock Options Activity	Stock option activity under the Company’s Plans for the three months ended March 31, 2017 is summarized as follows (in thousands, except per share amounts): Shares Weighted Average Outstanding at December 31, 2016 4,494 $ 20.04 Options exercised (1) (226) $ 13.68 Options expired (7) $ 27.63 Options cancelled/forfeited (4) $ 14.88 Outstanding at March 31, 2017 4,257 $ 20.37 (1) The Company generally issues new shares to satisfy stock option exercises.
Schedule of Restricted Stock and Restricted Stock Units Activity	Restricted stock and restricted stock unit activity under the Plans for the three months ended March 31, 2017 is summarized as follows (in thousands, except per share amounts): Shares Weighted Average Fair Value Per Share Awarded and unvested at December 31, 2016 (1) 22,250 $ 41.40 Granted (2) 6,793 $ 45.70 Vested (3,635) $ 34.94 Cancelled/forfeited (2,128) $ 37.85 Awarded and unvested at March 31, 2017 (1) 23,280 $ 43.99 (1) Includes the maximum number of shares issuable under the Company’s performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown. (2) Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the three months ended March 31, 2017 (including future-year tranches for which performance goals had not been set during the period); excludes tranches of previously granted performance-based restricted stock units for which performance goals were set during the three months ended March 31, 2017.

Restructuring Charges, Net (Tab

Restructuring Charges, Net (Tables)	3 Months Ended
	Mar. 31, 2017
Restructuring Charges, Net	For the three months ended March 31, 2016 and 2017, restructuring charges, net was comprised of the following (in thousands): Three Months Ended 2016 2017 Employee severance pay and related costs $ 44,796 $ 251 Non-cancelable lease, contract termination, and other charges 5,904 5,828 Reversals of previous charges (1,206) (267) Non-cash accelerations of stock-based compensation expense 7,374 - Other non-cash charges (credits), net 362 - Restructuring charges, net $ 57,230 $ 5,812
Restructuring Accrual Activity	The Company’s restructuring accrual activity for the three months ended March 31, 2017 is summarized as follows (in thousands): Accrual balance as of December 31, 2016 $ 43,458 Restructuring charges 5,812 Cash paid (10,288) Foreign currency translation and other adjustments 157 Accrual balance as of March 31, 2017 $ 39,139
Restructuring Accruals by Segment	Restructuring accruals by segment consisted of the following (in thousands): December 31, March 31, 2017 Americas $ 38,041 $ 36,009 EMEA 5,263 2,799 Asia Pacific 154 331 Total restructuring accruals $ 43,458 $ 39,139

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Information	The following tables present summarized information by segment (in thousands): Three Months Ended March 31, 2016 2017 Revenue by segment (1) Americas $ 861,539 $ 1,083,458 EMEA 76,923 107,782 Asia Pacific 148,690 136,030 Total Revenue $ 1,087,152 $ 1,327,270 TAC by segment (1) Americas $ 204,871 $ 432,684 EMEA 12,509 51,914 Asia Pacific 10,383 8,904 Total TAC $ 227,763 $ 493,502 Revenue ex-TAC by segment: Americas $ 656,668 $ 650,774 EMEA 64,414 55,868 Asia Pacific 138,307 127,126 Total Revenue ex-TAC 859,389 833,768 Direct costs by segment (2) Americas 72,508 59,313 EMEA 20,609 12,702 Asia Pacific 44,648 47,688 Global operating costs (3) 585,036 543,125 Gain on sale of patents (1,500) - Depreciation and amortization 139,665 115,099 Stock-based compensation expense 108,407 108,776 Restructuring charges, net 57,230 5,812 Loss from operations $ (167,214) $ (58,747) (1) Commencing in the second quarter of 2016, TAC payments related to the Microsoft Search Agreement, which previously would have been recorded as a reduction to revenue, began to be recorded as cost of revenue — TAC due to a required change in revenue presentation. See Note 1 — “The Company and Summary of Significant Accounting Policies” and Note 16 — “Microsoft Search Agreement” for additional information. (2) Direct costs for each segment include certain cost of revenue — other and costs associated with the local sales teams. Prior to the second quarter of 2016, certain account management costs associated with Yahoo Properties were managed locally and included as direct costs for each segment. Prior period amounts have been revised to conform to the current presentation. (3) Global operating costs include product development, marketing, real estate workplace, general and administrative, account management costs, and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment. Beginning in the second quarter of 2016, certain account management costs associated with Yahoo Properties are managed globally and included as global costs. Prior period amounts have been revised to conform to the current presentation.
Capital Expenditures by Segment	Three Months Ended March 31, 2016 2017 Capital expenditures, net: Americas $ 64,344 $ 49,028 EMEA 4,870 4,852 Asia Pacific 6,885 6,330 Total capital expenditures, net $ 76,099 $ 60,210
Property and Equipment, Net by Segment	December 31, March 31, 2017 Property and equipment, net: Americas: U.S. $ 1,120,124 $ 1,080,472 Other 3,086 3,000 Total Americas $ 1,123,210 $ 1,083,472 EMEA 28,360 30,115 Asia Pacific 58,367 64,136 Total property and equipment, net $ 1,209,937 $ 1,177,723
Enterprise Wide Disclosures Revenues for Groups of Similar Services	The following table presents revenue for groups of similar services (in thousands): Three Months Ended March 31, 2016 2017 Search $ 491,881 $ 744,738 Display 463,019 455,882 Other 132,252 126,650 Total revenue $ 1,087,152 $ 1,327,270 Three Months Ended March 31, 2016 2017 Revenue: U.S. $ 840,799 $ 1,043,587 International 246,353 283,683 Total revenue $ 1,087,152 $ 1,327,270

The Company And Summary Of Si38

The Company And Summary Of Significant Accounting Policies, Amounts Paid to Affiliates (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC		$ 493,502	$ 227,763
Microsoft Search Agreement
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC	[1]	303,799	0
Reduction to revenue in transitioned markets		$ 0	$ 271,328
[1]	For the three months ended March 31, 2017, cost of revenue-TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment.

The Company And Summary Of Si39

The Company And Summary Of Significant Accounting Policies, Amounts Paid to Affiliates (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC		$ 493,502	$ 227,763
Americas Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC	[1]	432,684	204,871
EMEA Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC	[1]	51,914	12,509
Asia Pacific Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC	[1]	8,904	10,383
Microsoft Search Agreement
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC	[2]	303,799	$ 0
Microsoft Search Agreement | Americas Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC		257,000
Microsoft Search Agreement | EMEA Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC		45,000
Microsoft Search Agreement | Asia Pacific Segment
Company and Summary of Significant Accounting Policies [Line Items]
Cost of revenue - TAC		$ 2,000
[1]	Commencing in the second quarter of 2016, TAC payments related to the Microsoft Search Agreement, which previously would have been recorded as a reduction to revenue, began to be recorded as cost of revenue - TAC due to a required change in revenue presentation. See Note 1 - "The Company and Summary of Significant Accounting Policies" and Note 16 - "Microsoft Search Agreement" for additional information.
[2]	For the three months ended March 31, 2017, cost of revenue-TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment.

The Company and Summary of Si40

The Company and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Company and Summary of Significant Accounting Policies [Line Items]
Benefit for income taxes	$ (26,177)	$ (34,766)
ASU 2016-09
Company and Summary of Significant Accounting Policies [Line Items]
Cumulative adjustment to retained earnings	108,000
Benefit for income taxes	$ (13,000)

Marketable Securities, Invest41

Marketable Securities, Investments and Fair Value Disclosures, Available for Sale Securities (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		$ 9,493,357	$ 9,543,158
Gross Unrealized Gains		38,712,700	30,974,032
Gross Unrealized Losses		(7,299)	(8,615)
Estimated Fair Value		48,198,758	40,508,575
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		532,678	650,344
Gross Unrealized Gains		21	43
Gross Unrealized Losses		(980)	(903)
Estimated Fair Value		531,719	649,484
Corporate Debt Securities, Commercial Paper, Time Deposits, And Bank Certificates Of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		6,162,799	6,144,991
Gross Unrealized Gains		1,074	812
Gross Unrealized Losses		(3,277)	(4,655)
Estimated Fair Value		6,160,596	6,141,148
Corporate Equity Securities | Alibaba Group
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		2,713,484	2,713,484
Gross Unrealized Gains		38,646,375	30,967,395
Gross Unrealized Losses		0	0
Estimated Fair Value		41,359,859	33,680,879
Corporate Equity Securities | Hortonworks, Inc
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		26,246	26,246
Gross Unrealized Gains		11,481	5,713
Gross Unrealized Losses		0	0
Estimated Fair Value		37,727	31,959
Corporate Equity Securities | Other corporate equity securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		8,150	8,093
Gross Unrealized Gains		0	69
Gross Unrealized Losses	[1]	(3,042)	(3,057)
Estimated Fair Value		5,108	$ 5,105
Corporate Equity Securities | Snap Inc
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		50,000
Gross Unrealized Gains		53,749
Gross Unrealized Losses		0
Estimated Fair Value		$ 103,749
[1]	Relates to the other corporate equity securities in an unrealized loss position for less than 12 months.

Marketable Securities, Invest42

Marketable Securities, Investments and Fair Value Disclosures, Available for Sale Marketable Securities by Balance Sheet Location (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Short-term marketable securities	$ 5,582,149	$ 5,700,925
Long-term marketable securities	1,110,166	1,089,707
Investment in Alibaba Group	41,359,859	33,680,879
Other long-term assets and investments	146,584	37,064
Total	$ 48,198,758	$ 40,508,575

Marketable Securities, Invest43

Marketable Securities, Investments and Fair Value Disclosures - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Investments [Line Items]
Cash and cash equivalents	$ 1,328,913	$ 1,479,604	$ 1,119,469	$ 1,631,911
(Loss) gain on Hortonworks warrants	5,385	$ (39,150)
Cash and Cash Equivalents
Investments [Line Items]
Short-term, highly-liquid investments	632,000		415,000
Other long-term assets and investments
Investments [Line Items]
Cost method investment balance	33,000		83,000
Cash deposited with commercial banks
Investments [Line Items]
Cash and cash equivalents	697,000		705,000
Hortonworks, Inc | Fair Value Measurements At Reporting Date Using Total
Investments [Line Items]
Warrants	$ 34,200		28,815
Convertible Senior Notes
Investments [Line Items]
Principal amount					$ 1,400,000
Convertible senior notes percent	0.00%				0.00%
Maturity date, convertible senior note	Dec. 1, 2018
Fair Value Measurements At Reporting Date Using Level 2 | Hortonworks, Inc
Investments [Line Items]
Warrants	$ 0		0
Fair Value Measurements At Reporting Date Using Level 2 | Convertible Senior Notes
Investments [Line Items]
Fair value of the convertible senior notes	$ 1,329,882		$ 1,314,876

Marketable Securities, Invest44

Marketable Securities, Investments and Fair Value Disclosures, Available for Sale Securities by Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Due within one year	$ 5,582,149	$ 5,700,925
Due after one year through five years	1,110,166	1,089,707
Total available-for-sale marketable debt securities	$ 6,692,315	$ 6,790,632

Marketable Securities, Invest45

Marketable Securities, Investments and Fair Value Disclosures, Available for Sale Marketable Debt Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 2,867,125	$ 2,899,540
Less than 12 Months, Unrealized Loss	(4,245)	(5,541)
12 Months or Longer, Fair Value	32,038	46,438
12 Months or Longer, Unrealized Loss	(12)	(17)
Total, Fair Value	2,899,163	2,945,978
Total, Unrealized Loss	(4,257)	(5,558)
Government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	486,628	543,605
Less than 12 Months, Unrealized Loss	(980)	(903)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Loss	0	0
Total, Fair Value	486,628	543,605
Total, Unrealized Loss	(980)	(903)
Corporate debt securities, commercial paper, and bank certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	2,380,497	2,355,935
Less than 12 Months, Unrealized Loss	(3,265)	(4,638)
12 Months or Longer, Fair Value	32,038	46,438
12 Months or Longer, Unrealized Loss	(12)	(17)
Total, Fair Value	2,412,535	2,402,373
Total, Unrealized Loss	$ (3,277)	$ (4,655)

Marketable Securities, Invest46

Marketable Securities, Investments and Fair Value Disclosures, Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 48,198,758	$ 40,508,575
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		41,988,337	34,093,229
Total financial assets and liabilities at fair value		41,988,337	34,093,229
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		6,843,499	6,841,914
Total financial assets and liabilities at fair value		6,826,289	6,832,581
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		34,200	28,815
Total financial assets and liabilities at fair value		34,200	28,815
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		48,866,036	40,963,958
Total financial assets and liabilities at fair value		48,848,826	40,954,625
Money Market Funds | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	533,768	375,286
Money Market Funds | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	0	0
Money Market Funds | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	0	0
Money Market Funds | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	[1]	533,768	375,286
Government and agency securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Government and agency securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	531,719	649,484
Government and agency securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Government and agency securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	531,719	649,484
Commercial Paper And Bank Certificates Of Deposit | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Commercial Paper And Bank Certificates Of Deposit | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	2,892,727	3,008,971
Commercial Paper And Bank Certificates Of Deposit | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Commercial Paper And Bank Certificates Of Deposit | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	2,892,727	3,008,971
Corporate Debt Securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Corporate Debt Securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	3,313,247	3,132,177
Corporate Debt Securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Corporate Debt Securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	3,313,247	3,132,177
Time Deposits | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Time Deposits | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	52,605	39,598
Time Deposits | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
Time Deposits | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	52,605	39,598
Foreign Currency Derivative Contracts | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts, assets	[2]	0	0
Foreign currency derivative contracts, liabilities	[2]	0	0
Foreign Currency Derivative Contracts | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts, assets	[2]	1,327	11,684
Foreign currency derivative contracts, liabilities	[2]	(17,210)	(9,333)
Foreign Currency Derivative Contracts | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts, assets	[2]	0	0
Foreign currency derivative contracts, liabilities	[2]	0	0
Foreign Currency Derivative Contracts | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts, assets	[2]	1,327	11,684
Foreign currency derivative contracts, liabilities	[2]	(17,210)	(9,333)
Other corporate equity securities | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	5,108	5,105
Other corporate equity securities | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	0	0
Other corporate equity securities | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	0	0
Other corporate equity securities | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	5,108	5,105
Alibaba Group | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		41,359,859	33,680,879
Alibaba Group | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Alibaba Group | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Alibaba Group | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		41,359,859	33,680,879
Hortonworks, Inc | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants		0	0
Hortonworks, Inc | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants		0	0
Hortonworks, Inc | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants		34,200	28,815
Hortonworks, Inc | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants		34,200	28,815
Hortonworks, Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	37,727	31,959
Hortonworks, Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	0	0
Hortonworks, Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	0	0
Hortonworks, Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	37,727	$ 31,959
Snap Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	51,875
Snap Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	51,874
Snap Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	0
Snap Inc | Corporate Equity Securities | Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[3]	$ 103,749
[1]	The money market funds, government and agency securities, commercial paper and bank certificates of deposit, corporate debt securities, and time deposits are classified as part of either cash and cash equivalents or short or long-term marketable securities on the condensed consolidated balance sheets.
[2]	Foreign currency derivative contracts are classified as part of either current or noncurrent assets or liabilities on the condensed consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were: $0.6 billion, including contracts designated as net investment hedges of $0.2 billion, as of December 31, 2016; and $0.4 billion, including contracts designated as net investment hedges of $0.2 billion, as of March 31, 2017.
[3]	Hortonworks, Snap and other corporate equity securities are classified as part of other long-term assets and investments on the condensed consolidated balance sheets.

Marketable Securities, Invest47

Marketable Securities, Investments and Fair Value Disclosures, Fair Value of Financial Assets and Liabilities (Parenthetical) (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Billions	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative notional amount	$ 0.4	$ 0.6
Designated as Hedging Instrument | Net Investment Hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative notional amount	$ 0.2	$ 0.2

Consolidated Financial Statem48

Consolidated Financial Statement Details, Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income [Line Items]
Unrealized gains on available-for-sale securities, net of tax	$ 22,964,176	$ 18,376,965
Unrealized losses on cash flow hedges, net of tax	(19)	(19)
Foreign currency translation adjustments, net of tax	(351,899)	100,947
Accumulated other comprehensive income	$ 22,612,258	$ 18,477,893

Consolidated Financial Statem49

Consolidated Financial Statement Details, Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Noncontrolling Interest [Line Items]
Beginning noncontrolling interests	$ 34,793	$ 35,883
Distributions to noncontrolling interests	(3,823)	0
Net income attributable to noncontrolling interests	506	942
Ending noncontrolling interests	$ 31,476	$ 36,825

Consolidated Financial Statem50

Consolidated Financial Statement Details, Other (Expense) Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Components of Other Income (Expense) [Line Items]
Interest and investment income	$ 20,582	$ 11,482
Interest expense	(18,844)	(18,393)
(Loss) gain on Hortonworks warrants	5,385	(39,150)
Foreign exchange (loss) gain	9,702	(2,138)
Other	1,997	783
Total other (expense) income, net	$ 18,822	$ (47,416)

Consolidated Financial Statem51

Consolidated Financial Statement Details - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financial Statement Details [Line Items]
(Loss) gain on Hortonworks warrants	$ 5,385	$ (39,150)

Consolidated Financial Statem52

Consolidated Financial Statement Details, Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ (1,327,270)	$ (1,087,152)
Other (expense) income, net	(18,822)	47,416
Total reclassifications for the period	(315)	703
Realized (gains) losses on available-for-sale securities, net of tax | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	178	202
Realized gains on foreign currency translation adjustments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	$ (493)
Realized (gain) losses on cash flow hedges, net of tax | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue		$ 501

Acquisitions and Dispositions -

Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands	Feb. 20, 2017USD ($)	Mar. 31, 2017USD ($)Entity	Mar. 31, 2016USD ($)Entity	Dec. 31, 2014USD ($)	Jul. 23, 2016USD ($)
Business Acquisition [Line Items]
Total cash consideration				$ 460,000
Gain on sale of patents		$ 0	$ 1,500
Sold Patents
Business Acquisition [Line Items]
Total cash consideration				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		$ 22,000	$ 22,000
Other Acquisitions
Business Acquisition [Line Items]
Business combination, number of entities acquired | Entity		0	0
Original Stock Purchase Agreement
Business Acquisition [Line Items]
Consideration to be received form sale of subsidiary					$ 4,825,800
SPA Amendment
Business Acquisition [Line Items]
Consideration to be received form sale of subsidiary	$ 4,475,800
Reduction in consideration to be received form sale of subsidiary	$ 350,000
RA Amendment
Business Acquisition [Line Items]
Post-closing liabilities arising from data breach percent retained	50.00%

Goodwill (Detail)

Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Goodwill [Line Items]
Beginning balance	$ 415,809
Foreign currency translation adjustments	14,654
Ending balance	430,463
Americas Segment
Goodwill [Line Items]
Beginning balance	123,985	[1]
Foreign currency translation adjustments	0	[1]
Ending balance	123,985	[1]
EMEA Segment
Goodwill [Line Items]
Beginning balance	0	[2]
Foreign currency translation adjustments	0	[2]
Ending balance	0	[2]
Asia Pacific Segment
Goodwill [Line Items]
Beginning balance	291,824	[3]
Foreign currency translation adjustments	14,654	[3]
Ending balance	$ 306,478	[3]
[1]	Gross goodwill balance for the Americas segment was $4.4 billion as of March 31, 2017. The Americas segment includes accumulated impairment losses of $4.3 billion as of March 31, 2017.
[2]	Gross goodwill balance for the EMEA segment was $1.2 billion as of March 31, 2017. The EMEA segment includes accumulated impairment losses of $1.2 billion as of March 31, 2017.
[3]	Gross goodwill balance for the Asia Pacific segment was $465 million as of March 31, 2017. The Asia Pacific segment includes accumulated impairment losses of $159 million as of March 31, 2017.

Goodwill (Parenthetical) (Detai

Goodwill (Parenthetical) (Detail) $ in Millions	Mar. 31, 2017USD ($)
Americas Segment
Goodwill [Line Items]
Gross Goodwill Balance	$ 4,400
Accumulated impairment losses	4,300
EMEA Segment
Goodwill [Line Items]
Gross Goodwill Balance	1,200
Accumulated impairment losses	1,200
Asia Pacific Segment
Goodwill [Line Items]
Gross Goodwill Balance	465
Accumulated impairment losses	$ 159

Intangible Assets, Net (Detail)

Intangible Assets, Net (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Total intangible assets, net [Line Items]
Gross Carrying Amount		$ 538,106
Accumulated Amortization	[1]	(395,682)
Net		142,424	$ 161,644
Customer, Affiliate And Advertiser Related Relationships
Total intangible assets, net [Line Items]
Gross Carrying Amount		349,293
Accumulated Amortization	[1]	(256,826)
Net		92,467	102,765
Developed Technology And Patents
Total intangible assets, net [Line Items]
Gross Carrying Amount		122,182
Accumulated Amortization	[1]	(82,588)
Net		39,594	47,243
Tradenames, Trademarks, And Domain Names
Total intangible assets, net [Line Items]
Gross Carrying Amount		66,631
Accumulated Amortization	[1]	(56,268)
Net		$ 10,363	$ 11,636
[1]	Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, totaled approximately $18 million as of March 31, 2017.

Intangible Assets, Net (Parenth

Intangible Assets, Net (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Total intangible assets, net [Line Items]
Cumulative foreign currency translation adjustments	$ 18

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total intangible assets, net [Line Items]
Amortization of intangible assets	$ 19,396,000	$ 32,288,000
Estimated amortization expense for the remainder of 2017	56,000,000
Estimated amortization expense 2018	55,000,000
Estimated amortization expense 2019	30,000,000
Estimated amortization expense 2020	1,000,000
Maximum
Total intangible assets, net [Line Items]
Estimated amortization expense 2021 and cumulatively thereafter	1,000,000
Cost of revenue - other
Total intangible assets, net [Line Items]
Amortization of intangible assets	$ 8,000,000	$ 14,000,000

Basic and Diluted Net (Loss) 59

Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. Common Stockholders Per Share - Additional Information (Detail) shares in Millions	3 Months Ended
	Mar. 31, 2017shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	2

Basic and Diluted Net (Loss) 60

Basic and Diluted Net (Loss) Income Attributable to Yahoo! Inc. - Common Stockholders Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net (loss) income attributable to Yahoo! Inc.	$ 99,434	$ (99,232)
Net (loss) income attributable to Yahoo! Inc. common stockholders - basic	$ 99,434	$ (99,232)
Weighted average common shares	955,859	945,719
Net (loss) income attributable to Yahoo! Inc. common stockholders per share - basic	$ 0.10	$ (0.10)
Net (loss) income attributable to Yahoo! Inc.	$ 99,434	$ (99,232)
Less: Net income attributable to participating securities	(1)	0
Less: Effect of dilutive securities issued by equity investees	(1,256)	0
Net (loss) income attributable to Yahoo! Inc. common stockholders - diluted	$ 98,177	$ (99,232)
Denominator for basic calculation	955,859	945,719
Denominator for diluted calculation	963,169	945,719
Net (loss) income attributable to Yahoo! Inc. common stockholders per share - diluted	$ 0.10	$ (0.10)
Restricted Stock Units (RSUs)
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares	4,810	0
Stock Options
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental common shares	2,500	0

Investments in Equity Interes61

Investments in Equity Interests Using the Equity Method of Accounting (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 2,841,100	$ 3,192,884
Equity Investment in Yahoo Japan
Schedule of Equity Method Investments [Line Items]
Percent ownership of common stock as of balance sheet date	35.50%	35.50%

Investments in Equity Interes62

Investments in Equity Interests Accounted for Using the Equity Method of Accounting - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Fair value of the company's ownership interest in the common stock of Yahoo Japan	$ 9,300
Revenue received through commercial arrangements with Yahoo Japan	66	$ 62
Receivables balance from Yahoo Japan	$ 46		$ 46

Investments in Equity Interes63

Investments in Equity Interests Accounted for Using the Equity Method of Accounting - Yahoo Japan Condensed Financial Information Operating Data (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Revenue	$ 1,232,624	$ 958,861
Gross profit	959,969	754,739
Income from operations	450,513	344,951
Net income	320,141	234,514
Net income attributable to Yahoo Japan	$ 321,283	$ 234,663

Investments in Equity Interes64

Investments in Equity Interests Accounted for Using the Equity Method of Accounting - Yahoo Japan Condensed Financial Information Balance Sheet Data (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Current assets	$ 6,749,240	$ 7,155,657
Long-term assets	3,823,752	4,332,498
Current liabilities	2,878,140	2,866,924
Long-term liabilities	380,635	435,253
Noncontrolling interests	$ 176,597	$ 209,363

Foreign Currency Derivative F65

Foreign Currency Derivative Financial Instruments, Notional Amounts of Outstanding Derivative Contracts (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative notional amount	$ 400	$ 600
Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
Derivative notional amount	200	200
Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
Derivative notional amount	25	19
Not Designated as Hedging Instrument | Balance Sheet Hedges
Derivative [Line Items]
Derivative notional amount	$ 195	$ 342

Foreign Currency Derivative F66

Foreign Currency Derivative Financial Instruments, Foreign Currency Derivative Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Derivative [Line Items]
Gain (Loss) Recorded in Other (Expense) Income, Net	$ 12,546		$ 6,524
Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
Beginning Fair Value	(9,000)		74,000
Settlement Payment (Receipt), Net	0		(31,000)
Gain (Loss) Recorded in Other (Expense) Income, Net	0		0
Gain (Loss) Recorded in Other Comprehensive (Loss) Income	(9,000)	[1]	(48,000)	[2]
Gain (Loss) Recorded in Revenue	0		0
Ending Fair Value	(18,000)		(5,000)
Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
Beginning Fair Value	0		2,000
Settlement Payment (Receipt), Net	0		(1,000)
Gain (Loss) Recorded in Other (Expense) Income, Net	0		0
Gain (Loss) Recorded in Other Comprehensive (Loss) Income	0		(3,000)
Gain (Loss) Recorded in Revenue	0		(1,000)
Ending Fair Value	0		(3,000)
Not Designated as Hedging Instrument | Balance Sheet Hedges
Derivative [Line Items]
Beginning Fair Value	11,000		2,000
Settlement Payment (Receipt), Net	(7,000)		(1,000)
Gain (Loss) Recorded in Other (Expense) Income, Net	(2,000)		(2,000)
Ending Fair Value	$ 2,000		$ (1,000)
[1]	This amount does not reflect the tax impact of $3 million recorded during the three months ended March 31, 2017. The $6 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company's condensed consolidated balance sheets.
[2]	This amount does not reflect the tax impact of $17 million recorded during the three months ended March 31, 2016. The $31 million after tax impact of the loss recorded within other comprehensive (loss) income was included in accumulated other comprehensive income on the Company's condensed consolidated balance sheets.

Foreign Currency Derivative F67

Foreign Currency Derivative Financial Instruments, Foreign Currency Derivative Activity (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Net investment hedge CTA gains (losses), taxes	$ 3,108	$ 16,931
Net investment hedge CTA gains (losses), net of taxes	$ (5,632)	$ (30,710)

Foreign Currency Derivative F68

Foreign Currency Derivative Financial Instruments, Foreign Currency Derivative Contracts Balance Sheet Location and Ending Fair Value (Detail) - Foreign Currency Derivative Contracts - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Designated as Hedging Instrument | Net Investment Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value asset	[1]	$ 0	$ 0
Designated as Hedging Instrument | Net Investment Hedges | Liabilities
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value liability	[2]	(18)	(9)
Designated as Hedging Instrument | Cash Flow Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value asset	[1]	0	0
Designated as Hedging Instrument | Cash Flow Hedges | Liabilities
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value liability	[2]	0	0
Not Designated as Hedging Instrument | Balance Sheet Hedges | Assets
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value asset	[1]	2	12
Not Designated as Hedging Instrument | Balance Sheet Hedges | Liabilities
Derivatives, Fair Value [Line Items]
Foreign currency derivative contract, fair value liability	[2]	$ 0	$ (1)
[1]	Included in prepaid expenses and other current assets or other long-term assets on the condensed consolidated balance sheets.
[2]	Included in accrued expenses and other current liabilities or other long-term liabilities on the condensed consolidated balance sheets.

Convertible Notes - Additional

Convertible Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Principal	$ 1,437,500	$ 1,437,500
Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes percent	0.00%		0.00%
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

Convertible Notes, Schedule of

Convertible Notes, Schedule of Notes (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal		$ 1,437,500	$ 1,437,500
Less: note discount		(120,388)	(137,555)
Net carrying amount		1,317,112	1,299,945
Equity component	[1]	$ 305,569	$ 305,569
[1]	Recorded on the condensed consolidated balance sheets within additional paid-in capital.

Convertible Notes, Interest Exp

Convertible Notes, Interest Expense Recognized Related To Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Accretion of convertible note discount	$ 17,167	$ 16,290

Convertible Notes, Fair Value a

Convertible Notes, Fair Value and Carrying Value of Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Carrying Value	$ 1,317,112	$ 1,299,945
Convertible Senior Notes
Debt Instrument [Line Items]
Carrying Value	1,317,112	1,299,945
Fair Value Measurements At Reporting Date Using Level 2 | Convertible Senior Notes
Debt Instrument [Line Items]
Fair Value	$ 1,329,882	$ 1,314,876

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) pure in Millions	Dec. 14, 2016	Sep. 22, 2016	Jan. 31, 2016Defendant	Dec. 31, 2016	Mar. 31, 2017USD ($)BuildingClaim
Maximum
Commitments and Contingencies Disclosure [Abstract]
Operating and capital lease agreements, original lease period					16 years
Operating and capital lease agreements, expiry year					2,025
Minimum
Commitments and Contingencies Disclosure [Abstract]
Operating and capital lease agreements, expiry year					2,017
Affiliate Commitments
Commitments and Contingencies Disclosure [Abstract]
Total commitments					$ 850,000,000
Payable in the remainder of 2017					225,000,000
Payable in 2018					300,000,000
Payable in 2019					300,000,000
Payable in 2020					25,000,000
Non-cancelable Obligations
Commitments and Contingencies Disclosure [Abstract]
Non-cancelable commitments					168,000,000
Payable in remainder of 2017					81,000,000
Payable in 2018					58,000,000
Payable in 2019					16,000,000
Payable in 2020					4,000,000
Payable in 2021					2,000,000
Payable in 2022					7,000,000
Intellectual Property Arrangements
Commitments and Contingencies Disclosure [Abstract]
Intellectual property arrangements through 2023					$ 4,000,000
Intellectual property arrangements, expiration year					2,023
California | Buildings
Commitments and Contingencies Disclosure [Abstract]
Number of buildings obligated to make payments for notes payable | Building					2
Note Payable Obligations					$ 51,000,000
Payable in remainder of 2017					4,000,000
Payable in 2018					5,000,000
Payable in 2019					5,000,000
Payable in 2020					5,000,000
Payable in 2021					5,000,000
Payable in 2022					6,000,000
Payable thereafter					21,000,000
Standby Letters of Credit
Commitments and Contingencies Disclosure [Abstract]
Standby letters of credit outstanding					34,000,000
TCPA Litigation Concerning Yahoo Messenger
Commitments and Contingencies Disclosure [Abstract]
Loss contingency, loss in period					1,500
TCPA Litigation Concerning Yahoo Messenger | Maximum
Commitments and Contingencies Disclosure [Abstract]
Penalty per violation					1,500
TCPA Litigation Concerning Yahoo Messenger | Minimum
Commitments and Contingencies Disclosure [Abstract]
Number of members comprised in the certified class | Defendant			300,000
Penalty per violation					$ 500
Security Incidents
Commitments and Contingencies Disclosure [Abstract]
Number of user accounts stolen		500		32
Security Incidents | Minimum
Commitments and Contingencies Disclosure [Abstract]
Number of user accounts stolen	1,000
Putative Consumer Class Action
Commitments and Contingencies Disclosure [Abstract]
Number of lawsuits filed | Claim					43
Putative Stockholder Class
Commitments and Contingencies Disclosure [Abstract]
Number of lawsuits filed | Claim					2
Stockholder Derivative Actions
Commitments and Contingencies Disclosure [Abstract]
Number of lawsuits filed | Claim					6
Putative Stockholder Class Purchased or Acquired Between November 12, 2013 and December 14, 2016
Commitments and Contingencies Disclosure [Abstract]
Number of lawsuits filed | Claim					2

Commitments and Contingencies,

Commitments and Contingencies, Lease Commitments (Detail) $ in Millions	Mar. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Line Items]
Gross operating lease commitments, Nine months ending December 31, 2017	$ 77
Gross operating lease commitments, 2018	76
Gross operating lease commitments, 2019	62
Gross operating lease commitments, 2020	48
Gross operating lease commitments, 2021	38
Gross operating lease commitments, 2022	27
Gross operating lease commitments, due after 5 years	60
Total gross operating lease commitments	388
Sublease income, Nine months ending December 31, 2017	(11)
Sublease income, 2018	(12)
Sublease income, 2019	(9)
Sublease income, 2020	(7)
Sublease income, 2021	(6)
Sublease income, 2022	(2)
Sublease income, Due after 5 years	0
Total sublease income	(47)
Net operating lease commitments, Nine months ending December 31, 2017	66
Net operating lease commitments, 2018	64
Net operating lease commitments, 2019	53
Net operating lease commitments, 2020	41
Net operating lease commitments, 2021	32
Net operating lease commitments, 2022	25
Net operating lease commitments, Due after 5 years	60
Total net operating lease commitments	$ 341

Commitments and Contingencies75

Commitments and Contingencies, Capital Lease Commitment (Detail) $ in Millions	Mar. 31, 2017USD ($)
Schedule of Capital Lease Obligations [Line Items]
Nine months ending December 31, 2017	$ 8
Years ending December 31, 2018	9
2,019	5
2,020	0
2,021	0
2,022	0
Due after 5 years	3
Gross capital lease commitments	25
Less: interest	4
Net capital lease commitments included in other accrued expenses and current liabilities and other long-term liabilities	$ 21

Stockholders' Equity And Empl76

Stockholders' Equity And Employee Benefits, Stock Option Activity (Detail) shares in Thousands	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance | shares	4,494
Options exercised | shares	(226)	[1]
Options expired | shares	(7)
Options cancelled/forfeited | shares	(4)
Outstanding, Ending balance | shares	4,257
Weighted average exercise price per share, Beginning balance | $ / shares	$ 20.04
Weighted average exercise price per share, options exercised | $ / shares	13.68	[1]
Weighted average exercise price per share, options expired | $ / shares	27.63
Weighted average exercise price per share, options cancelled/forfeited | $ / shares	14.88
Weighted average exercise price per share, Ending balance | $ / shares	$ 20.37
[1]	The Company generally issues new shares to satisfy stock option exercises.

Stockholders' Equity and Empl77

Stockholders' Equity and Employee Benefits - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments made to taxing authorities for employees' tax obligations	$ 67,901,000	$ 42,139,000
March 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock repurchase authorization						$ 2,000,000,000
Stock repurchase program expiration date	2018-03
Remaining authorized purchase capacity	$ 2,000,000,000
Repurchases of common stock, shares	0	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense	$ 3,000,000
Stock-based compensation, recognition period	1 year 2 months 12 days
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, recognition period	2 years 8 months 12 days
Unamortized stock-based compensation expense	$ 603,000,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested	3,635,000	3,400,000
Shares withheld to settle employees' minimum statutory obligation for applicable income and other employment taxes	1,500,000	1,400,000
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, recognition period	12 months
Equity award vesting period	4 years		4 years	4 years	4 years
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	3 years
2017 Tranche | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units grant date fair value	$ 5,000,000
Restricted stock units grant date	2017-03
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
Restricted stock units grant date	2016-03
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	$ 10,000,000
Restricted stock units grant date	2015-03
Fourth Tranche | Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units grant date fair value	$ 2,000,000
Restricted stock units grant date	2014-02
GAAP Revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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 restricted stock units awards	33.3333%
Adjusted EBITDA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial performance metrics for restricted stock units awards	33.3333%
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%
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%

Stockholders' Equity and Empl78

Stockholders' Equity and Employee Benefits, Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) - $ / shares shares in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded and unvested, Beginning balance	[1]	22,250
Granted	[2]	6,793
Vested		(3,635)	(3,400)
Cancelled/forfeited		(2,128)
Awarded and unvested, Ending balance	[1]	23,280
Weighted-average grant date fair value per share, Beginning balance	[1]	$ 41.40
Weighted-average grant date fair value per share, granted shares	[2]	45.70
Weighted-average grant date fair value per share, vested shares		34.94
Weighted-average grant date fair value per share, cancelled/forfeited shares		37.85
Weighted-average grant date fair value per share, Ending balance	[1]	$ 43.99
[1]	Includes the maximum number of shares issuable under the Company's performance-based restricted stock unit awards (including future-year tranches for which performance goals had not been set) as of the date shown.
[2]	Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the three months ended March 31, 2017 (including future-year tranches for which performance goals had not been set during the period); excludes tranches of previously granted performance-based restricted stock units for which performance goals were set during the three months ended March 31, 2017.

Restructuring Charges, Net (Det

Restructuring Charges, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Employee severance pay and related costs	$ 251	$ 44,796
Non-cancelable lease, contract termination, and other charges	5,828	5,904
Reversals of previous charges	(267)	(1,206)
Non-cash accelerations of stock-based compensation expense	0	7,374
Other non-cash charges (credits), net	0	362
Restructuring charges, net	$ 5,812	$ 57,230

Restructuring Charges, Net - Ad

Restructuring Charges, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 5,812	$ 57,230
Restructuring liability	39,139		$ 43,458
Americas Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	5,000	48,000
Restructuring liability	36,009		38,041
EMEA Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	1,000	7,000
Restructuring liability	2,799		5,263
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net		$ 2,000
Restructuring liability	331		$ 154
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 2,000
Restructuring liability, expected pay out period	The Company expects to pay out by the end of the second quarter of 2017
Non-Cancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 37,000
Restructuring liability, expected pay out period	The Company expects to pay over the terms of the related obligations through the fourth quarter of 2025

Restructuring Charges, Net, Res

Restructuring Charges, Net, Restructuring Accrual Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 43,458
Restructuring charges	5,812	$ 57,230
Cash paid	(10,288)
Foreign currency translation and other adjustments	157
Ending balance	$ 39,139

Restructuring Charges, Net, R82

Restructuring Charges, Net, Restructuring Accrual by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 39,139	$ 43,458
Americas Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	36,009	38,041
EMEA Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	2,799	5,263
Asia Pacific Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 331	$ 154

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2016
Income Taxes [Line Items]
Income tax benefits	$ (26,177,000)	$ (34,766,000)
Undistributed earnings of foreign subsidiaries	3,400,000,000
Unrecognized tax benefits	1,100,000,000
Unrecognized tax benefits recorded on condensed consolidated balance sheets	800,000,000
Reasonably possible reduction in unrecognized tax benefits in the next twelve months	9,000,000
Alibaba deferred tax liabilities	16,800,000,000				$ 13,600,000,000
Maximum
Income Taxes [Line Items]
Decrease in gross unrecognized tax benefit	$ 1,000,000
Earliest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,005
Latest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,015
Federal | Domestic | Earliest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,011
Federal | Domestic | Latest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,015
California Franchise Tax Board | State | Earliest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,009
Tax assessment year under appeal	2,005
Tax assessment year subject to examination	2,011
California Franchise Tax Board | State | Latest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,010
Tax assessment year under appeal	2,008
Tax assessment year subject to examination	2,015
Tax authorities from the Brazilian State | Foreign Tax Authority
Income Taxes [Line Items]
Indirect tax assessed, not accrued	$ 150,000,000
Tax authorities from the Brazilian State | Foreign Tax Authority | Earliest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,008
Tax authorities from the Brazilian State | Foreign Tax Authority | Latest Tax Year
Income Taxes [Line Items]
Tax year under examination	2,012
Alibaba Group
Income Taxes [Line Items]
Shares retained by the Company	384
Number of American Depositary Shares sold at initial public offering			140
Sale of investments in equity interests, shares				523

Segment Information (Detail)

Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue		$ 1,327,270	$ 1,087,152
TAC		493,502	227,763
Revenue ex-TAC		833,768	859,389
Global operating costs	[1]	543,125	585,036
Gain on sale of patents		0	(1,500)
Depreciation and amortization		115,099	139,665
Stock-based compensation expense		108,776	108,407
Restructuring charges, net		5,812	57,230
Loss from operations		(58,747)	(167,214)
Americas Segment
Segment Reporting Information [Line Items]
Revenue	[2]	1,083,458	861,539
TAC	[2]	432,684	204,871
Revenue ex-TAC		650,774	656,668
Direct costs by segment	[3]	59,313	72,508
Restructuring charges, net		5,000	48,000
EMEA Segment
Segment Reporting Information [Line Items]
Revenue	[2]	107,782	76,923
TAC	[2]	51,914	12,509
Revenue ex-TAC		55,868	64,414
Direct costs by segment	[3]	12,702	20,609
Restructuring charges, net		1,000	7,000
Asia Pacific Segment
Segment Reporting Information [Line Items]
Revenue	[2]	136,030	148,690
TAC	[2]	8,904	10,383
Revenue ex-TAC		127,126	138,307
Direct costs by segment	[3]	$ 47,688	44,648
Restructuring charges, net			$ 2,000
[1]	Global operating costs include product development, marketing, real estate workplace, general and administrative, account management costs, and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment. Beginning in the second quarter of 2016, certain account management costs associated with Yahoo Properties are managed globally and included as global costs. Prior period amounts have been revised to conform to the current presentation.
[2]	Commencing in the second quarter of 2016, TAC payments related to the Microsoft Search Agreement, which previously would have been recorded as a reduction to revenue, began to be recorded as cost of revenue - TAC due to a required change in revenue presentation. See Note 1 - "The Company and Summary of Significant Accounting Policies" and Note 16 - "Microsoft Search Agreement" for additional information.
[3]	Direct costs for each segment include certain cost of revenue - other and costs associated with the local sales teams. Prior to the second quarter of 2016, certain account management costs associated with Yahoo Properties were managed locally and included as direct costs for each segment. Prior period amounts have been revised to conform to the current presentation.

Segments, Capital Expenditures

Segments, Capital Expenditures by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 60,210	$ 76,099
Americas Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	49,028	64,344
EMEA Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	4,852	4,870
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total capital expenditures, net	$ 6,330	$ 6,885

Segments, Property and Equipmen

Segments, Property and Equipment Net by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 1,177,723	$ 1,209,937
Americas Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	1,083,472	1,123,210
Americas Segment | United States
Segment Reporting Information [Line Items]
Total property and equipment, net	1,080,472	1,120,124
Americas Segment | Other Americas
Segment Reporting Information [Line Items]
Total property and equipment, net	3,000	3,086
EMEA Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	30,115	28,360
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 64,136	$ 58,367

Segments, Enterprise Wide Discl

Segments, Enterprise Wide Disclosures Revenues for Groups of Similar Services (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue from External Customer [Line Items]
Total revenue	$ 1,327,270	$ 1,087,152
Search
Revenue from External Customer [Line Items]
Total revenue	744,738	491,881
Display
Revenue from External Customer [Line Items]
Total revenue	455,882	463,019
Other
Revenue from External Customer [Line Items]
Total revenue	126,650	132,252
United States
Revenue from External Customer [Line Items]
Total revenue	1,043,587	840,799
International
Revenue from External Customer [Line Items]
Total revenue	$ 283,683	$ 246,353

Segments - Additional Informati

Segments - Additional Information (Detail) - Country	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Number of foreign countries accounted for more than 10 percent of Company's revenue	0	0

Microsoft Search Agreement - Ad

Microsoft Search Agreement - Additional Information (Detail) - USD ($) $ in Thousands		Apr. 15, 2015	Feb. 23, 2015	Feb. 22, 2015	Feb. 23, 2010	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Search Agreement With Microsoft Corporation [Line Items]
Term of Microsoft search agreement with Microsoft, years					10 years
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 Microsoft 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%
Cost of revenue - TAC						$ 493,502	$ 227,763
Uncollected Microsoft Search Agreement revenue						364,000		$ 392,000
Microsoft Search Agreement
Search Agreement With Microsoft Corporation [Line Items]
Cost of revenue - TAC	[1]					$ 303,799	$ 0
Customer Concentration Risk | Sales Revenue, Net | Microsoft Search Agreement | Microsoft
Search Agreement With Microsoft Corporation [Line Items]
Concentration risk, percentage						42.00%	29.00%
[1]	For the three months ended March 31, 2017, cost of revenue-TAC included $257 million in the Americas segment, $45 million in the EMEA segment, and $2 million in the Asia Pacific segment.