Zynga (ZNGA) 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 15, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	ZNGA
Entity Registrant Name	ZYNGA INC
Entity Central Index Key	1439404
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		784,963,014
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		114,380,134
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,517,472

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$217,455	$131,303
Marketable securities	732,985	785,221
Accounts receivable, net of allowance of $0 at March 31, 2015 and December 31, 2014	79,521	89,611
Income tax receivable	4,502	3,304
Deferred tax assets	924	2,765
Restricted cash	48,098	48,047
Other current assets	28,800	22,688
Total current assets	1,112,285	1,082,939
Long-term marketable securities	148,411	231,385
Goodwill	633,511	650,778
Other intangible assets, net	57,678	66,861
Property and equipment, net	288,027	297,919
Other long-term assets	16,117	18,911
Total assets	2,256,029	2,348,793
Current liabilities:
Accounts payable	16,028	14,965
Other current liabilities	108,576	164,150
Deferred revenue	176,479	189,923
Total current liabilities	301,083	369,038
Deferred revenue	1,443	3,882
Deferred tax liabilities	6,406	5,323
Other non-current liabilities	73,959	74,858
Total liabilities	382,891	453,101
Stockholders' equity:
Common stock, $0.00000625 par value, and additional paid in capital - authorized shares: 2,020,517 shares outstanding: 913,797 shares (Class A, 778,792, Class B, 114,488, Class C, 20,517) as of March 31, 2015 and 905,860 (Class A, 770,658, Class B, 114,685, Class C, 20,517) as of December 31, 2014	3,143,285	3,096,982
Accumulated other comprehensive income (loss)	-51,350	-29,175
Accumulated deficit	-1,218,797	-1,172,115
Total stockholders' equity	1,873,138	1,895,692
Total liabilities and stockholders' equity	$2,256,029	$2,348,793

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance	$0	$0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	2,020,517,000	2,020,517,000
Common stock, shares outstanding	913,797,000	905,860,000
Common Class A [Member]
Common stock, shares outstanding	778,792,000	770,658,000
Common Class B [Member]
Common stock, shares outstanding	114,488,000	114,685,000
Common Class C [Member]
Common stock, shares outstanding	20,517,000	20,517,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Online game	$147,963	$132,270
Advertising and other	35,330	35,750
Total revenue	183,293	168,020
Costs and expenses:
Cost of revenue	57,622	53,504
Research and development	107,520	97,584
Sales and marketing	31,839	29,853
General and administrative	40,381	57,336
Total costs and expenses	237,362	238,277
Income (loss) from operations	-54,069	-70,257
Interest income (expense), net	794	870
Other income (expense), net	8,359	1,125
Income (loss) before income taxes	-44,916	-68,262
Provision for (benefit from) income taxes	1,580	-7,079
Net income (loss)	($46,496)	($61,183)
Net income (loss) per share:
Basic	($0.05)	($0.07)
Diluted	($0.05)	($0.07)
Weighted average common shares used to compute net income (loss) per share:
Basic	898,344	850,148
Diluted	898,344	850,148

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Partners' Capital [Abstract]
Net income (loss)	($46,496)	($61,183)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	-22,613	5,253
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	438	-127
Other comprehensive income (loss)	-22,175	5,126
Comprehensive income (loss)	($68,671)	($56,057)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income (loss)	($46,496)	($61,183)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	17,722	25,344
Stock-based expense	41,462	28,326
(Gain) loss from sales of investments, assets and other, net	-6,056	382
Tax benefits from stock-based awards		436
Excess tax benefits from stock-based awards		-436
Accretion and amortization on marketable securities	2,087	2,786
Deferred income taxes	998	-7,935
Changes in operating assets and liabilities:
Accounts receivable, net	10,090	-3,388
Income tax receivable	-1,198	135
Other assets	-7,687	-5,292
Accounts payable	1,063	-8,597
Deferred revenue	-15,883	-6,909
Other liabilities	-43,104	12,085
Net cash provided by (used in) operating activities	-47,002	-24,246
Investing activities:
Purchases of marketable securities	-101,091	-174,729
Sales and maturities of marketable securities	234,555	233,626
Acquisition of property and equipment	-2,112	-1,234
Business acquisition, net of cash acquired		-390,993
Proceeds from sale of property and equipment		4,935
Proceeds from sale of equity method investment	10,507
Other investing activities, net		200
Net cash provided by (used in) investing activities	141,859	-328,195
Financing activities:
Taxes paid related to net share settlement of equity awards	-1,008	-455
Proceeds from employee stock purchase plan and exercise of stock options	3,390	9,509
Excess tax benefits from stock-based awards		436
Acquisition related contingent consideration payment	-10,790
Net cash provided by (used in) financing activities	-8,408	9,490
Effect of exchange rate changes on cash and cash equivalents	-297	-119
Net increase (decrease) in cash and cash equivalents	86,152	-343,070
Cash and cash equivalents, beginning of period	131,303	465,523
Cash and cash equivalents, end of period	$217,455	$122,453

Overview_and_Summary_of_Signif

Overview and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Overview and Summary of Significant Accounting Policies	1. Overview and Summary of Significant Accounting Policies
	Organization and Description of Business
	Zynga Inc. (“Zynga,” “we” or “the Company”) develops, markets, and operates online social games as live services played over the Internet and on social networking sites and mobile platforms. We generate revenue through the in-game sale of virtual goods and through advertising. Our operations are headquartered in San Francisco, California, and we have several operating locations in the U.S., as well as various international office locations in Canada, Asia and Europe.
	We completed our initial public offering in December 2011 and our Class A common stock is listed on the NASDAQ Global Select Market under the symbol “ZNGA.”
	Basis of Presentation and Consolidation
	The accompanying consolidated financial statements are presented in accordance with United States generally accepted accounting principles (“U.S. GAAP”). The consolidated financial statements include the operations of us and our wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation.
	The accompanying interim consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2014.
	Unaudited Interim Financial Information
	The accompanying interim consolidated balance sheet as of March 31, 2015, the interim consolidated statements of operations, the interim consolidated statements of comprehensive income (loss) for the three months ended March 31, 2015 and 2014, the interim consolidated statements of cash flows for the three months ended March 31, 2015 and 2014 and the related footnote disclosures are unaudited. These unaudited consolidated interim financial statements have been prepared in accordance with U.S. GAAP. In management’s opinion, the unaudited consolidated interim financial statements have been prepared on the same basis as the audited consolidated financial statements and include all adjustments of a normal recurring nature necessary for the fair presentation of the Company’s statement of financial position and operating results for the periods presented. The results for the three months ended March 31, 2015 are not necessarily indicative of the results expected for the full fiscal year or any other future period.
	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts in the consolidated financial statements and notes thereto. Significant estimates and assumptions reflected in the financial statements include, but are not limited to, the estimated lives of virtual goods that we use for revenue recognition, useful lives of property and equipment and intangible assets, accrued liabilities, income taxes, accounting for business combinations, stock-based expense and evaluation of goodwill, intangible assets, and long-lived assets for impairment. Actual results could differ materially from those estimates.
	Changes in our estimated average life of durable virtual goods during the three months ended March 31, 2015 for various games resulted in an increase in revenue and income from continuing operations of $4.5 million, which is the result of adjusting the remaining recognition period of deferred revenue generated in prior periods at the time of a change in estimate. We also recorded $3.1 million of revenue and income from continuing operations in the three months ended March 31, 2015 due to changes in our estimated average life of durable goods for games that will be discontinued as there is no further service obligation after the closure of these games. These changes in estimates resulted in a $0.01 per share impact on our reported earnings per share for the first quarter of 2015.
	Accounting Policy Updates
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which requires revenue to be recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASU 2014-09 supersedes the existing revenue recognition guidance in “Revenue Recognition (Topic 605)”. In April 2015, the FASB issued an exposure draft to delay the effective date by one year. Under the proposal, the standard would be effective the first quarter of 2018. We are currently in the process of evaluating the impact of the adoption of ASU 2014-09 on our consolidated financial statements.

Marketable_Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	2. Marketable Securities
	The following tables summarize our amortized cost, gross unrealized gains and losses and fair value of our available-for-sale investments in marketable securities (in thousands):
		March 31, 2015
				Gross		Gross
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. government and government agency debt securities	$	343,394	$	99	$	(43	)	$	343,450
	Corporate debt securities		537,957		145		(156	)		537,946
	Total	$	881,351	$	244	$	(199	)	$	881,396
		31-Dec-14
				Gross		Gross
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. government and government agency debt securities	$	405,049	$	68	$	(135	)	$	404,982
	Corporate debt securities		611,950		39		(365	)		611,624
	Total	$	1,016,999	$	107	$	(500	)	$	1,016,606
	For more detail on our method for determining the fair value of our assets, see Note 3 – “Fair Value Measurements”
	The estimated fair value of available-for-sale marketable securities, classified by their contractual maturities was as follows (in thousands):
		March 31, 2015
	Due within one year	$	732,985
	After one year through three years		148,411
	Total	$	881,396
	Changes in market interest rates and bond yields cause certain of our investments to fall below their cost basis, resulting in unrealized losses on marketable securities. As of March 31, 2015, we had unrealized losses of $0.2 million related to marketable securities that had a fair value of $351.4 million. As of December 31, 2014, we had unrealized losses of $0.5 million related to marketable securities that had a fair value of $621.5 million. None of these securities were in a material continuous unrealized loss position for more than 12 months.
	As of March 31, 2015 and December 31, 2014, we did not consider any of our marketable securities to be other-than-temporarily impaired. When evaluating our investments for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer, our ability and intent to hold the security to maturity and whether it is more likely than not that we will be required to sell the investment before recovery of its cost basis.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements
	Our financial instruments consist of cash equivalents, short-term and long-term marketable securities and accounts receivable. Accounts receivable, net is stated at its carrying value, which approximates fair value.
	Cash equivalents and short-term and long-term marketable securities, consisting of money market funds, U.S. government and government agency debt securities, municipal securities and corporate debt securities, are carried at fair value, which is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between knowledgeable and willing market participants.
	Our contingent consideration liability represents the estimated fair value of the additional consideration payable in connection with our acquisition of Spooky Cool Labs LLC (“Spooky Cool Labs”). The amount payable is contingent upon the achievement of certain performance milestones for each of Spooky Cool Labs’ fiscal years ended June 30, 2014 and June 30, 2015. In the first quarter of 2015, we executed an amended agreement with Spooky Cool Labs. Under the terms of the amended agreement, the maximum amount payable by us is $58.8 million, which includes $53.8 million of contingent consideration and $5.0 million related to bonuses. We recorded $9.4 million of expense within research and development in our consolidated statement of operations and paid $53.8 million in the first quarter of 2015 to fully settle the contingent consideration liability balance related to Spooky Cool Labs. The remaining $5.0 million for bonuses will be paid on or before June 30, 2015.
	We initially estimated the acquisition date fair value of the contingent consideration payable using probability-weighted discounted cash flow models, and applied a discount rate that appropriately captured a market participant’s view of the risk associated with the obligations. The significant unobservable inputs used in the fair value measurement of the acquisition-related contingent consideration payable were forecasted future cash flows and the timing of those cash flows.
	Fair value is a market-based measurement that should be determined based on assumptions that knowledgeable and willing market participants would use in pricing an asset or liability. The valuation techniques used to measure the fair value of the Company’s debt instruments and all other financial instruments, all of which have counterparties with high credit ratings, were valued based on quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. We use a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 — Includes inputs, other than Level 1 inputs, that are directly or indirectly observable in the marketplace.
	Level 3 — Unobservable inputs that are supported by little or no market activity.
	The composition of our financial instruments among the three Levels of the fair value hierarchy are as follows (in thousands):
			March 31, 2015
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	120,529	$	—	$	—	$	120,529
	U.S. government and government agency debt securities			—		343,450		—		343,450
	Corporate debt securities			—		537,946		—		537,946
	Total		$	120,529	$	881,396	$	—	$	1,001,925
			31-Dec-14
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	41,595	$	—	$	—	$	41,595
	U.S. government and government agency debt securities			—		404,982		—		404,982
	Corporate debt securities			—		611,624		—		611,624
	Total		$	41,595	$	1,016,606	$	—	$	1,058,201
	Liabilities:
	Contingent consideration		$	—	$	—	$	44,420	$	44,420
	(1)	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	4. Property and Equipment
	Property and equipment consist of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Computer equipment	$	142,702		$	141,946
	Software		31,855			31,778
	Land		89,130			89,130
	Building		194,574			194,574
	Furniture and fixtures		10,747			10,616
	Leasehold improvements		9,683			9,694
			478,691			477,738
	Less accumulated depreciation		(190,664	)		(179,819	)
	Total property and equipment, net	$	288,027		$	297,919

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	5. Goodwill and Other Intangible Assets
	Changes in the carrying value of goodwill from December 31, 2014 to March 31, 2015 are as follows (in thousands):
	Goodwill – December 31, 2014		$	650,778
	Foreign currency translation adjustments (1)			(19,926	)
	Goodwill adjustments (2)			2,659
	Goodwill – March 31, 2015		$	633,511
	(1)	The decrease is primarily related to translation losses on goodwill associated with the acquisition of NaturalMotion denominated in British pounds.
	(2)	Includes the impact of adjustments to goodwill resulting from changes in net assets (liabilities) acquired (assumed) and other adjustments, pursuant to our business combinations policy.
	The details of our acquisition-related intangible assets as of March 31, 2015 are as follows (in thousands):
			March 31, 2015
			Gross Carrying			Accumulated			Net Book Value
			Value			Amortization
	Developed technology		$	148,138		$	(99,784	)	$	48,354
	Trademarks, branding and domain names			16,292			(8,393	)		7,899
	Acquired lease intangibles			5,707			(4,282	)		1,425
	Total		$	170,137		$	(112,459	)	$	57,678
	The details of our acquisition-related intangible assets as of December 31, 2014 are as follows (in thousands):
			December 31, 2014
			Gross Carrying			Accumulated			Net Book Value
			Value			Amortization
	Developed technology		$	151,376		$	(94,560	)	$	56,816
	Trademarks, branding and domain names			16,292			(7,861	)		8,431
	Acquired lease intangibles			5,708			(4,094	)		1,614
	Total		$	173,376		$	(106,515	)	$	66,861
	These assets were, and continue to be, amortized on a straight-line basis. As of March 31, 2015, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2015		$	19,286
	2016			23,703
	2017			5,808
	2018 and thereafter			2,761
	Total		$	51,558

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes
	The expense from income taxes increased by $8.7 million in the first quarter of 2015 as compared to the same period of the prior year. This increase was primarily attributable to an increase in foreign tax expense of $0.8 million related to a change in our jurisdictional mix of earnings and the tax benefit recorded in the first quarter of 2014 of $7.8 million related the release of the valuation allowance associated with the 2013 Federal research and development tax credit.
	Once the Company is profitable, we expect our global effective tax rate to be less than the U.S. statutory income tax rate.

Other_Current_Liabilities

Other Current Liabilities	3 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	7. Other Current Liabilities
	Other current liabilities consist of the following (in thousands):
		March 31,		December 31,
		2015		2014
	Accrued escrow for acquisitions	$	47,906	$	47,906
	Contingent consideration liability		—		44,420
	Accrued compensation liability		15,151		26,113
	Accrued restructuring liability		6,457		7,214
	Accrued accounts payable		19,219		17,542
	Other current liabilities		19,843		20,955
	Total other current liabilities	$	108,576	$	164,150
	Other current liabilities include various expenses that we accrue for transaction taxes, customer deposits and revenue sharing arrangements.

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring	8. Restructuring
	During the three months ended March 31, 2015, we recorded a total restructuring charge of $3.5 million which was classified within our consolidated statement of operations under General and Administrative.
	Q1 2015 Restructuring Plan
	During the three months ended March 31, 2015, our board of directors authorized, and we implemented a restructuring plan that included a reduction in work force and closure of the Beijing, China office as part of the overall plan to reduce the Company’s long term cost structure. As a result of this restructuring, we recorded a charge of $3.2 million in the three months ended March 31, 2015, which is included in operating expenses in our consolidated statement of operations. The $3.2 million restructuring charge in the three months ended March 31, 2015 is comprised of $2.3 million of employee severance costs and $0.9 million related to lease and contract termination costs. This restructuring charge does not include the impact of $0.1 million of net stock-based expense reversals associated with the net effect of forfeitures from employee terminations. The remaining liability related to our Q1 2015 restructuring plan as of March 31, 2015 was $0.3 million and is expected to be paid by June 30, 2015.
	The following table presents the activity for the three months March 31, 2015 related to the Q1 2015 restructuring plan (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	—
	Restructuring expense and adjustments		3,241
	Cash payments		(2,911	)
	Restructuring liability (Q1 2015 Plan) - end of period	$	330
	Q1 2014 Restructuring Plan
	The following table presents the activity for the three months March 31, 2015 related to the Q1 2014 restructuring plan (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	10,009
	Restructuring expense and adjustments		189
	Cash payments		(2,116	)
	Restructuring liability (Q1 2014 Plan) - end of period	$	8,082
	The remaining liability of $8.1 million is expected to be paid out over the next 1.8 years.
	Other Plans
	The following table presents the activity for the three months ended March 31, 2015 related to all other remaining historical restructuring plans from prior years (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	2,857
	Restructuring expense and adjustments		31
	Cash payments		(931	)
	Restructuring liability (2013 Plan) - end of period	$	1,957
	The remaining liability of $2.0 million is expected to be paid out over the next 2.6 years.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity	9. Stockholders’ Equity
	We recorded stock-based expense related to grants of employee and consultant stock options, warrants, restricted stock and restricted stock units (“ZSUs”) in our consolidated statements of operations as follows (in thousands):
		Three Months Ended March 31,
		2015			2014
	Cost of revenue	$	1,072		$	1,279
	Research and development		28,317			18,416
	Sales and marketing		1,519			1,458
	General and administrative		10,554			7,173
	Total stock-based expense	$	41,462		$	28,326
	The following table shows stock option activity for the three months ended March 31, 2015 (in thousands, except weighted-average exercise price and weighted-average contractual term):
		Outstanding Options
					Weighted-			Aggregate			Weighted-
					Average			Intrinsic Value of			Average
					Exercise			Stock Options			Contractual Term
		Stock Options			Price			Outstanding			(in years)
	Balance as of December 31, 2014		39,460		$	2.22		$	47,347			6.74
	Granted		—			—
	Forfeited and cancelled		(1,598	)		3.29
	Exercised		(550	)		0.3
	Balance as of March 31, 2015		37,312		$	2.2		$	50,028			6.5
	The following table shows a summary of ZSU activity for the three months ended March 31, 2015 (in thousands, except weighted-average grant date fair value):
		Outstanding ZSUs
					Weighted-			Aggregate
					Average Grant Date			Intrinsic Value of
					Fair			Unvested
		Shares			Value			ZSUs
	Unvested as of December 31, 2014		69,883		$	3.64		$	185,889
	Granted		4,709			2.33
	Vested		(6,274	)		4.79
	Forfeited and cancelled		(5,834	)		3.07
	Unvested as of March 31, 2015		62,484		$	3.48		$	178,079
	The following table shows a summary of changes in accumulated other comprehensive income by component for the three months ended March 31, 2015 (in thousands):
		Foreign Currency			Unrealized Gains (Losses)			Total
		Translation			on  Available-for-Sale
					Securities
	Balance as of December 31, 2014	$	(28,781	)	$	(394	)	$	(29,175	)
	Other comprehensive income (loss) before reclassifications		(22,613	)		453			(22,160	)
	Amounts reclassified from accumulated other comprehensive income		—			(15	)		(15	)
	Net current-period other comprehensive income (loss)		(22,613	)		438			(22,175	)
	Balance as of March 31, 2015	$	(51,394	)	$	44		$	(51,350	)

Net_Income_Loss_Per_Share_of_C

Net Income (Loss) Per Share of Common Stock	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share of Common Stock	10. Net Income (Loss) Per Share of Common Stock
	Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. In computing diluted net income (loss) per share, net income (loss) is re-allocated to reflect the potential impact of dilutive securities, including stock options, warrants, unvested restricted stock and unvested ZSUs. Diluted net income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding, including potential dilutive securities. For periods in which we have generated a net loss, we do not include stock options, warrants, unvested restricted stock and unvested ZSUs in our computation of diluted net income (loss) per share, as the impact of these awards is anti-dilutive. The net per share amounts are the same for Class A, Class B and Class C common stock because the holders of each class are legally entitled to equal per share distributions whether through dividend or distribution. Further, as we assume the conversion of Class B and Class C common shares into Class A common shares for the Class A diluted net income (loss) per share computation, the net income (loss) is equal to total net income (loss) for that computation.
	The following table sets forth the computation of basic and diluted net income (loss) per share of common stock (in thousands, except per share data):
		Three Months Ended March 31,
		2015									2014
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(39,525	)	$	(5,909	)	$	(1,062	)	$	(50,782	)	$	(8,924	)	$	(1,477	)
	Weighted-average common shares outstanding		763,658			114,169			20,517			705,627			124,004			20,517
	Basic net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.07	)	$	(0.07	)	$	(0.07	)
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(39,525	)	$	(5,909	)	$	(1,062	)	$	(50,782	)	$	(8,924	)	$	(1,477	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(1,062	)		—			—			(1,477	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(5,909	)		—			—			(8,924	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(46,496	)	$	(5,909	)	$	(1,062	)	$	(61,183	)	$	(8,924	)	$	(1,477	)
	Weighted-average common shares outstanding-basic		763,658			114,169			20,517			705,627			124,004			20,517
	Conversion of Class C to Class A common shares		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares		114,169			—			—			124,004			—			—
	Weighted-average common shares outstanding-diluted		898,344			114,169			20,517			850,148			124,004			20,517
	Diluted net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.07	)	$	(0.07	)	$	(0.07	)
	The following weighted-average equity awards were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended March 31,
		2015			2014
	Stock options		38,798			42,027
	Restricted shares		11,129			9,081
	ZSUs		68,127			58,817
	Total		118,054			109,925

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies
	Lease Commitments
	We have entered into operating leases for facilities, including data center space. As of March 31, 2015, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2015	$	19,043
	2016		23,638
	2017		14,292
	2018		13,074
	2019		13,234
	2020 and thereafter		21,918
		$	105,199
	Credit Facility
	In June 2013, we amended our existing revolving credit agreement which we originally executed in July 2011, reducing our maximum available credit from $1.0 billion to $200 million, and extending the term through June 2018. Per the terms of our amended agreement, we paid additional up-front fees of $0.3 million to be amortized over the remaining extended term of the loan. The interest rate for the amended credit facility is determined based on a formula using certain market rates, as described in the amended credit agreement. Additionally, our minimum quarterly commitment fee was reduced from $0.6 million per quarter to $0.1 million per quarter based on the portion of the credit facility that is not drawn down. The agreement requires us to comply with certain covenants, including maintaining a minimum capitalization ratio, and maintaining a minimum cash balance. As of March 31, 2015, we had not drawn down any amounts under the credit facility and were in compliance with these covenants.
	Legal Matters
	On July 30, 2012, a purported securities class action captioned DeStefano v. Zynga Inc. et al., Case No. 3:12-cv-04007-JSW, was filed in the United States District Court for the Northern District of California against the Company, and certain of our current and former directors, officers, and executives. Additional purported securities class actions containing similar allegations were filed in the Northern District. On September 26, 2012, the court consolidated various of the class actions as In re Zynga Inc. Securities Litigation, Lead Case No. 12-cv-04007-JSW. On January 23, 2013, the court entered an order appointing a lead plaintiff and approving lead plaintiff’s selection of lead counsel. On April 3, 2013, the lead plaintiff and another named plaintiff filed a consolidated complaint. On February 25, 2014, the court granted the defendants’ motion to dismiss the consolidated complaint and provided plaintiffs leave to file an amended complaint.
	The lead plaintiff filed a First Amended Complaint on March 31, 2014. The First Amended Complaint alleges that the defendants violated the federal securities laws by issuing false or misleading statements regarding the Company’s business and financial projections. The plaintiffs seek to represent a class of persons who purchased or otherwise acquired the Company’s securities between February 14, 2012 and July 25, 2012. The First Amended Complaint asserts claims for unspecified damages, and an award of costs and expenses to the putative class, including attorneys’ fees. On March 25, 2015, the Court issued an order denying the defendants’ motion to dismiss the First Amended Complaint. On April 21, 2015, the defendants requested leave to file a motion for reconsideration of that order. On April 24, 2015, the plaintiffs opposed the motion. On April 28, 2015, the Court denied the defendants’ motion. A case management conference is scheduled for June 12, 2015.
	In addition, a purported securities class action captioned Reyes v. Zynga Inc., et al. was filed on August 1, 2012, in San Francisco County Superior Court. The action was removed to federal court, and was later remanded to San Francisco County Superior Court. The complaint alleges that the defendants violated the federal securities laws by issuing false or misleading statements in connection with an April 2012 secondary offering of Class A common stock. The plaintiff seeks to represent a class of persons who acquired the Company’s common stock pursuant or traceable to the secondary offering. On June 10, 2013, the defendants filed a motion to stay the action and a demurrer arguing that the complaint should be dismissed because the court lacks jurisdiction over the claims. On August 26, 2013, the court issued orders overruling the demurrer and granting the motion to stay all deadlines in the action pending a ruling on the motion to dismiss in the federal securities class action described above. On September 29, 2014, the court issued orders denying a motion to continue the stay of the action and overruling a demurrer arguing that the complaint failed to state a cause of action. On October 15, 2014, the defendants filed a petition in the California Court of Appeal seeking review of the denial of the motion to stay and of the trial court’s ruling that it had jurisdiction to hear the claims. On January 29, 2015, the Court of Appeal denied defendants’ petition. On February 11, 2015, the court granted plaintiff’s request for voluntary dismissal of the action with prejudice as to the named plaintiff’s claims and without prejudice as to the claims of any other members of the proposed class.
	On April 4, 2013, a purported class action captioned Lee v. Pincus, et al. was filed in the Court of Chancery of the State of Delaware against the Company, and certain of our current and former directors, officers, and executives. The complaint alleges that the defendants breached fiduciary duties in connection with the release of certain lock-up agreements entered into in connection with the Company’s initial public offering. The plaintiff seeks to represent a class of certain of the Company’s shareholders who were subject to the lock-up agreements and who were not permitted to sell shares in an April 2012 secondary offering. On January 17, 2014, the plaintiff filed an amended complaint. On March 6, 2014, the defendants filed motions to dismiss the amended complaint and a motion to stay discovery while the motions to dismiss were pending. On November 14, 2014, the court denied the motion to dismiss brought by Zynga and the directors and granted the motion to dismiss brought by the underwriters who had been named as defendants.
	Although it is reasonably possible that our assessment of the possibility of loss could change in the near term due to one or more confirming events, the Company believes it has meritorious defenses in the above securities class actions and will vigorously defend these actions. Furthermore, given that we are in the early stages of the litigation process, we are unable to estimate the range of potential loss, if any.
	Since August 3, 2012, nine stockholder derivative lawsuits have been filed in State or Federal courts in California and Delaware purportedly on behalf of the Company against certain current and former directors and executive officers of the Company. The derivative plaintiffs allege that the defendants breached their fiduciary duties and violated California Corporations Code section 25402 in connection with our initial public offering in December 2011, secondary offering in April 2012, and allegedly made false or misleading statements regarding the Company’s business and financial projections.
	Beginning on August 3, 2012, three of the actions were filed in San Francisco County Superior Court. On October 2, 2012, the court consolidated those three actions as In re Zynga Shareholder Derivative Litigation, Lead Case CGC-12-522934. On March 14, 2013, the plaintiffs filed a First Amended Complaint in that consolidated California state action. On March 21, 2013, the court endorsed a stipulation among the parties staying the action pending the ruling on the motion to dismiss in the federal securities class action described above. On March 24, 2014, the court endorsed a stipulation among the parties staying the action pending a ruling on a motion to dismiss the First Amended Complaint in the federal securities class action. The parties have requested that the stay remain in effect pending a ruling on the motion to stay or dismiss the derivative action pending in Delaware Chancery Court (discussed below).
	Beginning on August 16, 2012, four stockholder derivative actions were filed in the United States District Court for the Northern District of California. On December 3, 2012, the court consolidated these four actions as In re Zynga Inc. Derivative Litigation, Lead Case No. 12-CV-4327-JSW. On March 11, 2013, the court endorsed a stipulation among the parties staying the action pending the ruling on the motion to dismiss in the federal securities class action described above. On March 21, 2014, the court issued an order continuing the stay pending a ruling on a motion to dismiss the First Amended Complaint in the federal securities class action. The parties have requested that the stay remain in effect pending a ruling on the motion to stay or dismiss the derivative action pending in Delaware Chancery Court (discussed below).
	A derivative action was also filed in the United States District Court for the District of Delaware. The plaintiff in the District of Delaware action voluntarily dismissed the action on November 19, 2012.
	On April 2, 2014, a derivative action was filed in the Court of Chancery of the State of Delaware entitled Sandys v. Pincus, et al. Case No. 9512-VCN. On October 21, 2014, the court endorsed a stipulation among the parties staying the action until the earlier of December 9, 2014, or thirty days after a decision on the motion to dismiss the First Amended Complaint in the federal securities class action. On December 9, 2014, the defendants filed a motion to stay or dismiss the action. Briefing on the motion to stay or dismiss is ongoing and is scheduled to continue through May 15, 2015.
	The derivative actions include claims for, among other things, unspecified damages in favor of the Company, certain corporate actions to purportedly improve the Company’s corporate governance, and an award of costs and expenses to the derivative plaintiffs, including attorneys’ fees. We believe that the plaintiffs in the derivative actions lack standing to pursue litigation on behalf of Zynga.
	Because the actions described above are in the early stages of the litigation process, we are not in a position to assess whether any loss or adverse effect on our financial condition is probable or remote or to estimate the range of potential loss, if any.
	The Company is also party to various other legal proceedings and claims which arise in the ordinary course of business. In addition, we may receive notifications alleging infringement of patent or other intellectual property rights. Adverse results in any such litigation, legal proceedings or claims may include awards of substantial monetary damages, costly royalty or licensing agreements, or orders preventing us from offering certain games, features, or services, and may also result in changes in our business practices, which could result in additional costs or a loss of revenue for us and could otherwise harm our business. Although the results of such litigation cannot be predicted with certainty, we believe that the amount or range of reasonably possible losses related to such pending or threatened litigation will not have a material adverse effect on our business, operating results, cash flows, or financial condition should such litigation be resolved unfavorably. We recognize legal expenses as incurred.

Geographical_Information

Geographical Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Geographical Information	12. Geographical Information
	The following represents our revenue based on the geographic location of our players (in thousands):
	Revenue
			Three Months Ended
			March 31,
			2015		2014
	United States		$	117,540	$	99,105
	All other countries (1)			65,753		68,915
	Total revenue		$	183,293	$	168,020
	(1)	No country exceeded 10% of our total revenue for any periods presented.
	The following represents our property and equipment, net by location (in thousands):
	Property and equipment, net
			March 31,		December 31,
			2015		2014
	United States		$	285,074	$	294,708
	All other countries			2,953		3,211
	Total property and equipment, net		$	288,027	$	297,919

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events
	Changes in Executive Officers
	On April 8, 2015, Don Mattrick resigned as Chief Executive Officer. The Board appointed Mark Pincus, Zynga’s Chairman of the Board, as Zynga’s Chief Executive Officer. Mr. Pincus is our Founder and had previously served as Zynga’s Chief Executive Officer from April 2007 to July 2013. In addition, he served as Chief Product Officer from April 2007 to April 2014 and has served as Chairman of the Board since April 2007.
	On April 19, 2015, Clive Downie resigned as Chief Operating Officer.
	On May 6, 2015, we announced a cost reduction plan expected to generate pre-tax savings of approximately $100 million, excluding an estimated $18 million to $22 million pre-tax restructuring charge in the second quarter of 2015. As part of the plan, we expect to complete a reduction of approximately 18% of our current workforce across our studios, including contractors, and implement additional cost reduction measures, including lowering costs and eliminating spend on outside and centralized services. We expect the workforce reduction to be complete in the fourth quarter of 2015 and generate approximately $45 million in annualized savings. We expect the reduction in centralized services costs and spend to be complete by the third quarter of 2016 and generate approximately $55 million in annualized savings. All savings estimates exclude restructuring charges.
	This cost reduction plan could negatively impact our ability to attract, hire and retain key employees, which is critical to our ability to grow our business and execute on our business strategy. In addition, our cost-cutting measures could negatively impact our business including delaying the introduction of new games and/or disrupting live services. For more information on risks, please see the section titled “Risk Factors”.

Overview_and_Summary_of_Signif1

Overview and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation
	The accompanying consolidated financial statements are presented in accordance with United States generally accepted accounting principles (“U.S. GAAP”). The consolidated financial statements include the operations of us and our wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation.
	The accompanying interim consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2014.
Unaudited Interim Financial Information	Unaudited Interim Financial Information
	The accompanying interim consolidated balance sheet as of March 31, 2015, the interim consolidated statements of operations, the interim consolidated statements of comprehensive income (loss) for the three months ended March 31, 2015 and 2014, the interim consolidated statements of cash flows for the three months ended March 31, 2015 and 2014 and the related footnote disclosures are unaudited. These unaudited consolidated interim financial statements have been prepared in accordance with U.S. GAAP. In management’s opinion, the unaudited consolidated interim financial statements have been prepared on the same basis as the audited consolidated financial statements and include all adjustments of a normal recurring nature necessary for the fair presentation of the Company’s statement of financial position and operating results for the periods presented. The results for the three months ended March 31, 2015 are not necessarily indicative of the results expected for the full fiscal year or any other future period.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts in the consolidated financial statements and notes thereto. Significant estimates and assumptions reflected in the financial statements include, but are not limited to, the estimated lives of virtual goods that we use for revenue recognition, useful lives of property and equipment and intangible assets, accrued liabilities, income taxes, accounting for business combinations, stock-based expense and evaluation of goodwill, intangible assets, and long-lived assets for impairment. Actual results could differ materially from those estimates.
	Changes in our estimated average life of durable virtual goods during the three months ended March 31, 2015 for various games resulted in an increase in revenue and income from continuing operations of $4.5 million, which is the result of adjusting the remaining recognition period of deferred revenue generated in prior periods at the time of a change in estimate. We also recorded $3.1 million of revenue and income from continuing operations in the three months ended March 31, 2015 due to changes in our estimated average life of durable goods for games that will be discontinued as there is no further service obligation after the closure of these games. These changes in estimates resulted in a $0.01 per share impact on our reported earnings per share for the first quarter of 2015.
Accounting Policy Updates	Accounting Policy Updates
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which requires revenue to be recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASU 2014-09 supersedes the existing revenue recognition guidance in “Revenue Recognition (Topic 605)”. In April 2015, the FASB issued an exposure draft to delay the effective date by one year. Under the proposal, the standard would be effective the first quarter of 2018. We are currently in the process of evaluating the impact of the adoption of ASU 2014-09 on our consolidated financial statements.
Fair Value of Financial Instruments	Our financial instruments consist of cash equivalents, short-term and long-term marketable securities and accounts receivable. Accounts receivable, net is stated at its carrying value, which approximates fair value.
	Cash equivalents and short-term and long-term marketable securities, consisting of money market funds, U.S. government and government agency debt securities, municipal securities and corporate debt securities, are carried at fair value, which is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between knowledgeable and willing market participants.
	Our contingent consideration liability represents the estimated fair value of the additional consideration payable in connection with our acquisition of Spooky Cool Labs LLC (“Spooky Cool Labs”). The amount payable is contingent upon the achievement of certain performance milestones for each of Spooky Cool Labs’ fiscal years ended June 30, 2014 and June 30, 2015. In the first quarter of 2015, we executed an amended agreement with Spooky Cool Labs. Under the terms of the amended agreement, the maximum amount payable by us is $58.8 million, which includes $53.8 million of contingent consideration and $5.0 million related to bonuses. We recorded $9.4 million of expense within research and development in our consolidated statement of operations and paid $53.8 million in the first quarter of 2015 to fully settle the contingent consideration liability balance related to Spooky Cool Labs. The remaining $5.0 million for bonuses will be paid on or before June 30, 2015.
Fair Value Measurement	Fair value is a market-based measurement that should be determined based on assumptions that knowledgeable and willing market participants would use in pricing an asset or liability. The valuation techniques used to measure the fair value of the Company’s debt instruments and all other financial instruments, all of which have counterparties with high credit ratings, were valued based on quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. We use a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 — Includes inputs, other than Level 1 inputs, that are directly or indirectly observable in the marketplace.
	Level 3 — Unobservable inputs that are supported by little or no market activity.

Marketable_Securities_Tables

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of Available-for-Sale Investments	The following tables summarize our amortized cost, gross unrealized gains and losses and fair value of our available-for-sale investments in marketable securities (in thousands):
		March 31, 2015
				Gross		Gross
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. government and government agency debt securities	$	343,394	$	99	$	(43	)	$	343,450
	Corporate debt securities		537,957		145		(156	)		537,946
	Total	$	881,351	$	244	$	(199	)	$	881,396
		31-Dec-14
				Gross		Gross
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. government and government agency debt securities	$	405,049	$	68	$	(135	)	$	404,982
	Corporate debt securities		611,950		39		(365	)		611,624
	Total	$	1,016,999	$	107	$	(500	)	$	1,016,606
Fair Value of Available-for-Sale Marketable Securities by Contractual Maturities	The estimated fair value of available-for-sale marketable securities, classified by their contractual maturities was as follows (in thousands):
		March 31, 2015
	Due within one year	$	732,985
	After one year through three years		148,411
	Total	$	881,396

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Assets Measured on Recurring Basis	The composition of our financial instruments among the three Levels of the fair value hierarchy are as follows (in thousands):
			March 31, 2015
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	120,529	$	—	$	—	$	120,529
	U.S. government and government agency debt securities			—		343,450		—		343,450
	Corporate debt securities			—		537,946		—		537,946
	Total		$	120,529	$	881,396	$	—	$	1,001,925
			31-Dec-14
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	41,595	$	—	$	—	$	41,595
	U.S. government and government agency debt securities			—		404,982		—		404,982
	Corporate debt securities			—		611,624		—		611,624
	Total		$	41,595	$	1,016,606	$	—	$	1,058,201
	Liabilities:
	Contingent consideration		$	—	$	—	$	44,420	$	44,420
	(1)	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment_Tables

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Property and equipment consist of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Computer equipment	$	142,702		$	141,946
	Software		31,855			31,778
	Land		89,130			89,130
	Building		194,574			194,574
	Furniture and fixtures		10,747			10,616
	Leasehold improvements		9,683			9,694
			478,691			477,738
	Less accumulated depreciation		(190,664	)		(179,819	)
	Total property and equipment, net	$	288,027		$	297,919

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying value of goodwill from December 31, 2014 to March 31, 2015 are as follows (in thousands):
	Goodwill – December 31, 2014		$	650,778
	Foreign currency translation adjustments (1)			(19,926	)
	Goodwill adjustments (2)			2,659
	Goodwill – March 31, 2015		$	633,511
	(1)	The decrease is primarily related to translation losses on goodwill associated with the acquisition of NaturalMotion denominated in British pounds.
	(2)	Includes the impact of adjustments to goodwill resulting from changes in net assets (liabilities) acquired (assumed) and other adjustments, pursuant to our business combinations policy.
Acquisition-Related Intangible Assets	The details of our acquisition-related intangible assets as of March 31, 2015 are as follows (in thousands):
			March 31, 2015
			Gross Carrying			Accumulated			Net Book Value
			Value			Amortization
	Developed technology		$	148,138		$	(99,784	)	$	48,354
	Trademarks, branding and domain names			16,292			(8,393	)		7,899
	Acquired lease intangibles			5,707			(4,282	)		1,425
	Total		$	170,137		$	(112,459	)	$	57,678
	The details of our acquisition-related intangible assets as of December 31, 2014 are as follows (in thousands):
			December 31, 2014
			Gross Carrying			Accumulated			Net Book Value
			Value			Amortization
	Developed technology		$	151,376		$	(94,560	)	$	56,816
	Trademarks, branding and domain names			16,292			(7,861	)		8,431
	Acquired lease intangibles			5,708			(4,094	)		1,614
	Total		$	173,376		$	(106,515	)	$	66,861
Schedule of Finite Lived Intangible Assets Future Amortization Expense	As of March 31, 2015, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2015		$	19,286
	2016			23,703
	2017			5,808
	2018 and thereafter			2,761
	Total		$	51,558

Other_Current_Liabilities_Tabl

Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities consist of the following (in thousands):
		March 31,		December 31,
		2015		2014
	Accrued escrow for acquisitions	$	47,906	$	47,906
	Contingent consideration liability		—		44,420
	Accrued compensation liability		15,151		26,113
	Accrued restructuring liability		6,457		7,214
	Accrued accounts payable		19,219		17,542
	Other current liabilities		19,843		20,955
	Total other current liabilities	$	108,576	$	164,150

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Summary of Historical Restructuring Liability	The following table presents the activity for the three months March 31, 2015 related to the Q1 2015 restructuring plan (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	—
	Restructuring expense and adjustments		3,241
	Cash payments		(2,911	)
	Restructuring liability (Q1 2015 Plan) - end of period	$	330
	Q1 2014 Restructuring Plan
	The following table presents the activity for the three months March 31, 2015 related to the Q1 2014 restructuring plan (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	10,009
	Restructuring expense and adjustments		189
	Cash payments		(2,116	)
	Restructuring liability (Q1 2014 Plan) - end of period	$	8,082
	Other Plans
	The following table presents the activity for the three months ended March 31, 2015 related to all other remaining historical restructuring plans from prior years (in thousands):
		Three Months Ended
		March 31, 2015
	Restructuring liability - beginning of period	$	2,857
	Restructuring expense and adjustments		31
	Cash payments		(931	)
	Restructuring liability (2013 Plan) - end of period	$	1,957

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Expense Related to Grants of Employee and Consultant Stock Options, Warrants, Restricted Stock and Restricted Stock Units (ZSUs)	We recorded stock-based expense related to grants of employee and consultant stock options, warrants, restricted stock and restricted stock units (“ZSUs”) in our consolidated statements of operations as follows (in thousands):
		Three Months Ended March 31,
		2015			2014
	Cost of revenue	$	1,072		$	1,279
	Research and development		28,317			18,416
	Sales and marketing		1,519			1,458
	General and administrative		10,554			7,173
	Total stock-based expense	$	41,462		$	28,326
Schedule of Share Based Compensation Stock Option Activity	The following table shows stock option activity for the three months ended March 31, 2015 (in thousands, except weighted-average exercise price and weighted-average contractual term):
		Outstanding Options
					Weighted-			Aggregate			Weighted-
					Average			Intrinsic Value of			Average
					Exercise			Stock Options			Contractual Term
		Stock Options			Price			Outstanding			(in years)
	Balance as of December 31, 2014		39,460		$	2.22		$	47,347			6.74
	Granted		—			—
	Forfeited and cancelled		(1,598	)		3.29
	Exercised		(550	)		0.3
	Balance as of March 31, 2015		37,312		$	2.2		$	50,028			6.5
Schedule of Share Based Compensation Restricted Stock Units Award Activity	The following table shows a summary of ZSU activity for the three months ended March 31, 2015 (in thousands, except weighted-average grant date fair value):
		Outstanding ZSUs
					Weighted-			Aggregate
					Average Grant Date			Intrinsic Value of
					Fair			Unvested
		Shares			Value			ZSUs
	Unvested as of December 31, 2014		69,883		$	3.64		$	185,889
	Granted		4,709			2.33
	Vested		(6,274	)		4.79
	Forfeited and cancelled		(5,834	)		3.07
	Unvested as of March 31, 2015		62,484		$	3.48		$	178,079
Schedule of Accumulated Other Comprehensive Income Loss	The following table shows a summary of changes in accumulated other comprehensive income by component for the three months ended March 31, 2015 (in thousands):
		Foreign Currency			Unrealized Gains (Losses)			Total
		Translation			on  Available-for-Sale
					Securities
	Balance as of December 31, 2014	$	(28,781	)	$	(394	)	$	(29,175	)
	Other comprehensive income (loss) before reclassifications		(22,613	)		453			(22,160	)
	Amounts reclassified from accumulated other comprehensive income		—			(15	)		(15	)
	Net current-period other comprehensive income (loss)		(22,613	)		438			(22,175	)
	Balance as of March 31, 2015	$	(51,394	)	$	44		$	(51,350	)

Net_Income_Loss_Per_Share_of_C1

Net Income (Loss) Per Share of Common Stock (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share of Common Stock	The following table sets forth the computation of basic and diluted net income (loss) per share of common stock (in thousands, except per share data):
		Three Months Ended March 31,
		2015									2014
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(39,525	)	$	(5,909	)	$	(1,062	)	$	(50,782	)	$	(8,924	)	$	(1,477	)
	Weighted-average common shares outstanding		763,658			114,169			20,517			705,627			124,004			20,517
	Basic net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.07	)	$	(0.07	)	$	(0.07	)
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(39,525	)	$	(5,909	)	$	(1,062	)	$	(50,782	)	$	(8,924	)	$	(1,477	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(1,062	)		—			—			(1,477	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(5,909	)		—			—			(8,924	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(46,496	)	$	(5,909	)	$	(1,062	)	$	(61,183	)	$	(8,924	)	$	(1,477	)
	Weighted-average common shares outstanding-basic		763,658			114,169			20,517			705,627			124,004			20,517
	Conversion of Class C to Class A common shares		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares		114,169			—			—			124,004			—			—
	Weighted-average common shares outstanding-diluted		898,344			114,169			20,517			850,148			124,004			20,517
	Diluted net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.07	)	$	(0.07	)	$	(0.07	)
Weighted Average Employee Equity Awards	The following weighted-average equity awards were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended March 31,
		2015			2014
	Stock options		38,798			42,027
	Restricted shares		11,129			9,081
	ZSUs		68,127			58,817
	Total		118,054			109,925

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments for Operating Leases	As of March 31, 2015, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2015	$	19,043
	2016		23,638
	2017		14,292
	2018		13,074
	2019		13,234
	2020 and thereafter		21,918
		$	105,199

Geographical_Information_Table

Geographical Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Revenue by Geographical Area	The following represents our revenue based on the geographic location of our players (in thousands):
	Revenue
			Three Months Ended
			March 31,
			2015		2014
	United States		$	117,540	$	99,105
	All other countries (1)			65,753		68,915
	Total revenue		$	183,293	$	168,020
	(1)	No country exceeded 10% of our total revenue for any periods presented.
Property and Equipment, Net	The following represents our property and equipment, net by location (in thousands):
	Property and equipment, net
			March 31,		December 31,
			2015		2014
	United States		$	285,074	$	294,708
	All other countries			2,953		3,211
	Total property and equipment, net		$	288,027	$	297,919

Overview_and_Summary_of_Signif2

Overview and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Initial offering period	Dec-11
Increase in revenue and income from continuing operations	$4.50
Revenue and income from continuing operations	$3.10
Impact on reported earnings per share	$0.01

Marketable_Securities_Summary_

Marketable Securities - Summary of Available-for-Sale Investments (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$881,351	$1,016,999
Gross Unrealized Gains	244	107
Gross Unrealized Losses	-199	-500
Aggregate Fair Value	881,396	1,016,606
U.S. government and government agency debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	343,394	405,049
Gross Unrealized Gains	99	68
Gross Unrealized Losses	-43	-135
Aggregate Fair Value	343,450	404,982
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	537,957	611,950
Gross Unrealized Gains	145	39
Gross Unrealized Losses	-156	-365
Aggregate Fair Value	$537,946	$611,624

Marketable_Securities_Fair_Val

Marketable Securities - Fair Value of Available-for-Sale Marketable Securities by Contractual Maturities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Marketable Securities [Abstract]
Due within one year	$732,985
After one year through three years	148,411	231,385
Aggregate Fair Value	$881,396	$1,016,606

Marketable_Securities_Addition

Marketable Securities - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Marketable Securities [Abstract]
Unrealized losses	$200,000	$500,000
Fair value	351,400,000	621,500,000
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$0	$0

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum amount payable	$58.80
Contingent consideration payable	53.8
Business combination related to bonuses	5
Business combination bonuses to be paid	5
Contingent consideration liability settled	53.8
Research and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of contingent consideration liability	$9.40

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value Assets Measured on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	$1,001,925	$1,058,201
Contingent consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities Fair Value Disclosure Recurring		44,420
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	120,529	41,595
U.S. government and government agency debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	343,450	404,982
Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	537,946	611,624
Fair value, inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	120,529	41,595
Fair value, inputs, Level 1 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	120,529	41,595
Fair value, inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	881,396	1,016,606
Fair value, inputs, Level 2 [Member] | U.S. government and government agency debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	343,450	404,982
Fair value, inputs, Level 2 [Member] | Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure Recurring	537,946	611,624
Fair value, inputs, Level 3 [Member] | Contingent consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities Fair Value Disclosure Recurring		$44,420

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$478,691	$477,738
Less accumulated depreciation	-190,664	-179,819
Total property and equipment, net	288,027	297,919
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	142,702	141,946
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89,130	89,130
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	194,574	194,574
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,747	10,616
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,683	9,694
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$31,855	$31,778

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Schedule of Goodwill (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$650,778
Foreign currency translation adjustments	-19,926
Goodwill adjustments	2,659
Goodwill, ending balance	$633,511

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Acquisition-Related Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$170,137	$173,376
Accumulated Amortization	-112,459	-106,515
Net Book Value	57,678	66,861
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	148,138	151,376
Accumulated Amortization	-99,784	-94,560
Net Book Value	48,354	56,816
Trademarks, branding and domain names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	16,292	16,292
Accumulated Amortization	-8,393	-7,861
Net Book Value	7,899	8,431
Acquired lease intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,707	5,708
Accumulated Amortization	-4,282	-4,094
Net Book Value	$1,425	$1,614

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Schedule of Finite Lived Intangible Assets Future Amortization Expense (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2015	$19,286
2016	23,703
2017	5,808
2018 and thereafter	2,761
Total	$51,558

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Increase in income tax expense benefit	$8.70
Changes in estimated jurisdictional mix of earnings		0.8
Federal research and development tax credit [Member]
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Incremental benefit		$7.80

Other_Current_Liabilities_Sche

Other Current Liabilities - Schedule of Other Current Liabilities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]
Accrued escrow for acquisitions	$47,906	$47,906
Contingent consideration liability		44,420
Accrued compensation liability	15,151	26,113
Accrued restructuring liability	6,457	7,214
Accrued accounts payable	19,219	17,542
Other current liabilities	19,843	20,955
Total other current liabilities	$108,576	$164,150

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$1,957,000	$2,857,000
Restructuring liability, expected paid out period	2 years 7 months 6 days
General and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charge	3,500,000
2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charge	3,200,000
Employee severance costs pay and related costs	2,300,000
Lease and contract termination costs	900,000
Stock-based expense reversals	100,000
Restructuring liability	330,000
2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$8,082,000	$10,009,000
Restructuring liability, expected paid out period	1 year 9 months 18 days

Restructuring_Summary_of_Histo

Restructuring - Summary of Historical Restructuring Liability (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	$2,857
Restructuring expense and adjustments	31
Cash payments	-931
Restructuring liability, Ending balance	1,957
2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense and adjustments	3,241
Cash payments	-2,911
Restructuring liability, Ending balance	330
2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	10,009
Restructuring expense and adjustments	189
Cash payments	-2,116
Restructuring liability, Ending balance	$8,082

Stockholders_Equity_StockBased

Stockholders' Equity - Stock-Based Expense Related to Grants of Employee and Consultant Stock Options, Warrants, Restricted Stock and Restricted Stock Units (ZSUs) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based expense	$41,462	$28,326
Cost of revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based expense	1,072	1,279
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based expense	28,317	18,416
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based expense	1,519	1,458
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based expense	$10,554	$7,173

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Share Based Compensation Stock Option Activity (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Outstanding, Beginning balance	39,460
Stock Options, Granted	0
Stock Options, Forfeited and cancelled	-1,598
Stock Options, Exercised	-550
Stock Options Outstanding, Ending balance	37,312	39,460
Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$2.22
Weighted Average Exercise Price, Granted	$0
Weighted Average Exercise Price, Forfeited and cancelled	$3.29
Weighted Average Exercise Price, Exercised	$0.30
Outstanding Options, Weighted Average Exercise Price, Ending Balance	$2.20	$2.22
Outstanding Options, Aggregate Intrinsic Value of Stock Options Outstanding	$50,028	$47,347
Weighted Average Contractual Term (in years)	6 years 6 months	6 years 8 months 27 days

Stockholders_Equity_Schedule_o1

Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) (Restricted Stock Units (ZSUs) [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Restricted Stock Units (ZSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Outstanding Shares, Beginning balance	69,883
Nonvested Shares, Granted	4,709
Nonvested Shares, Vested	-6,274
Nonvested Shares, Forfeited and cancelled	-5,834
Nonvested Outstanding Shares, Ending balance	62,484
Weighted Average Grant Date Fair Value, Beginning balance	$3.64
Weighted Average Grant Date Fair Value, Granted	$2.33
Weighted Average Grant Date Fair Value, Vested	$4.79
Weighted Average Grant Date Fair Value, Forfeited and cancelled	$3.07
Weighted Average Grant Date Fair Value, Ending balance	$3.48
Nonvested Aggregated Intrinsic Value, Beginning balance	$185,889
Nonvested Aggregated Intrinsic Value, Ending balance	$178,079

Stockholders_Equity_Schedule_o2

Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	($29,175)
Other comprehensive income before reclassifications, net of tax	-22,160
Amounts reclassified from accumulated other comprehensive income, net of tax	-15
Other comprehensive income (loss)	-22,175	5,126
Accumulated other comprehensive income, net of tax, Ending balance	-51,350
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	-28,781
Other comprehensive income before reclassifications, net of tax	-22,613
Other comprehensive income (loss)	-22,613
Accumulated other comprehensive income, net of tax, Ending balance	-51,394
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	-394
Other comprehensive income before reclassifications, net of tax	453
Amounts reclassified from accumulated other comprehensive income, net of tax	-15
Other comprehensive income (loss)	438
Accumulated other comprehensive income, net of tax, Ending balance	$44

Net_Income_Loss_Per_Share_of_C2

Net Income (Loss) Per Share of Common Stock - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share of Common Stock (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
BASIC:
Net income (loss) attributable to common stockholders	($46,496)	($61,183)
Weighted-average common shares outstanding	898,344	850,148
Basic net income (loss) per share	($0.05)	($0.07)
DILUTED:
Weighted-average common shares outstanding-basic	898,344	850,148
Weighted-average common shares outstanding-diluted	898,344	850,148
Diluted net income (loss) per share	($0.05)	($0.07)
Common Class A [Member]
BASIC:
Net income (loss) attributable to common stockholders	-39,525	-50,782
Weighted-average common shares outstanding	763,658	705,627
Basic net income (loss) per share	($0.05)	($0.07)
DILUTED:
Net income (loss) attributable to common stockholders	-39,525	-50,782
Net income (loss) attributable to common stockholders-diluted	-46,496	-61,183
Weighted-average common shares outstanding-basic	763,658	705,627
Weighted-average common shares outstanding-diluted	898,344	850,148
Diluted net income (loss) per share	($0.05)	($0.07)
Common Class A [Member] | Class C Convert To Class A [Member]
DILUTED:
Reallocation of net income (loss) as a result of common stock class conversion	-1,062	-1,477
Conversion of common stock class	20,517	20,517
Common Class A [Member] | Class B convert to Class A [Member]
DILUTED:
Reallocation of net income (loss) as a result of common stock class conversion	-5,909	-8,924
Conversion of common stock class	114,169	124,004
Common Class B [Member]
BASIC:
Net income (loss) attributable to common stockholders	-59,909	-8,924
Weighted-average common shares outstanding	114,169	124,004
Basic net income (loss) per share	($0.05)	($0.07)
DILUTED:
Net income (loss) attributable to common stockholders	-5,909	-8,924
Net income (loss) attributable to common stockholders-diluted	-5,909	-8,924
Weighted-average common shares outstanding-basic	114,169	124,004
Weighted-average common shares outstanding-diluted	114,169	124,004
Diluted net income (loss) per share	($0.05)	($0.07)
Common Class C [Member]
BASIC:
Net income (loss) attributable to common stockholders	-1,062	-1,477
Weighted-average common shares outstanding	20,517	20,517
Basic net income (loss) per share	($0.05)	($0.07)
DILUTED:
Net income (loss) attributable to common stockholders	-1,062	-1,477
Net income (loss) attributable to common stockholders-diluted	($1,062)	($1,477)
Weighted-average common shares outstanding-basic	20,517	20,517
Weighted-average common shares outstanding-diluted	20,517	20,517
Diluted net income (loss) per share	($0.05)	($0.07)

Net_Income_Loss_Per_Share_of_C3

Net Income (Loss) Per Share of Common Stock - Weighted Average Employee Equity Awards (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	118,054	109,925
Restricted shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	11,129	9,081
Restricted Stock Units (ZSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	68,127	58,817
Zynga Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	38,798	42,027

Commitments_and_Contingencies_1

Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$19,043
2016	23,638
2017	14,292
2018	13,074
2019	13,234
2020 and thereafter	21,918
Total operating leases, future minimum payments	$105,199

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	0 Months Ended					32 Months Ended	0 Months Ended
	Jun. 30, 2013	Mar. 31, 2015	Mar. 11, 2013	Nov. 19, 2012	Jun. 30, 2012	Aug. 01, 2012	Apr. 04, 2013	Mar. 31, 2015	Aug. 03, 2012	Aug. 16, 2012	Apr. 02, 2014
			Cases	Cases	Cases	Cases	Cases	Cases	Cases	Cases	Cases
Loss Contingencies [Line Items]
Line of credit facility, initiation date		31-Jul-11
Debt instrument issuance date	2018-06
Line of credit facility maximum borrowing capacity	$1,000,000,000
Line of credit facility commitment fee amount	600,000
Amended Credit Facility [Member]
Loss Contingencies [Line Items]
Line of credit facility maximum borrowing capacity	200,000,000
Line of credit facility additional up-front fees	300,000
Line of credit facility frequency of commitment fee payment		Quarterly
Line of credit facility commitment fee amount	$100,000
Line of credit facility, interest rate description		The interest rate for the amended credit facility is determined based on a formula using certain market rates, as described in the amended credit agreement.
Delaware [Member]
Loss Contingencies [Line Items]
Claims filed			1
Claims settled				1
Case one [Member] | Northern California [Member]
Loss Contingencies [Line Items]
Claims filed					1
Reyes v. Zynga Inc. [Member] | San Francisco [Member]
Loss Contingencies [Line Items]
Claims filed						1
Lee v. Pincus [Member] | Delaware [Member]
Loss Contingencies [Line Items]
Claims filed							1
Stockholder Derivative Lawsuits [Member]
Loss Contingencies [Line Items]
Claims filed								9
Zynga Shareholder Derivative Litigation [Member] | San Francisco [Member]
Loss Contingencies [Line Items]
Claims filed									3
Zynga Inc. Derivative Litigation [Member] | Northern California [Member]
Loss Contingencies [Line Items]
Claims filed										4
Sandys v. Pincus [Member] | Delaware [Member]
Loss Contingencies [Line Items]
Claims filed											1

Geographical_Information_Reven

Geographical Information - Revenue by Geographical Area (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$183,293	$168,020
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	117,540	99,105
All other countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$65,753	$68,915

Geographical_Information_Reven1

Geographical Information - Revenue by Geographical Area (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Percentage of total revenue	10.00%

Geographical_Information_Prope

Geographical Information - Property and Equipment, Net (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$288,027	$297,919
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	285,074	294,708
All other countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$2,953	$3,211

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2015	Sep. 30, 2016	6-May-15	Jun. 30, 2015
Scenario, Forecast [Member] | Workforce Reduction [Member]
Subsequent Event [Line Items]
Expected annualized savings	$45
Scenario, Forecast [Member] | Service Costs [Member]
Subsequent Event [Line Items]
Expected annualized savings		55
Scenario, Forecast [Member] | Minimum [Member]
Subsequent Event [Line Items]
Estimated pre-tax restructuring charge				18
Scenario, Forecast [Member] | Maximum [Member]
Subsequent Event [Line Items]
Estimated pre-tax restructuring charge				22
Subsequent Event [Member]
Subsequent Event [Line Items]
Expected annualized savings			$100
Expected workforce reduction percentage			18.00%