Zynga (ZNGA) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 15, 2014	Oct. 15, 2014	Oct. 15, 2014
		Common Class A [Member]	Common Class B [Member]	Common Class C [Member]
Document Information [Line Items]	'	'	'	'
Document Type	'10-Q	'	'	'
Amendment Flag	'false	'	'	'
Document Period End Date	30-Sep-14	'	'	'
Document Fiscal Year Focus	'2014	'	'	'
Document Fiscal Period Focus	'Q3	'	'	'
Trading Symbol	'ZNGA	'	'	'
Entity Registrant Name	'ZYNGA INC	'	'	'
Entity Central Index Key	'0001439404	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'
Entity Filer Category	'Large Accelerated Filer	'	'	'
Entity Common Stock, Shares Outstanding	'	767,444,484	114,893,043	20,517,472

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$128,278	$465,523
Marketable securities	697,484	659,973
Accounts receivable, net of allowance of $0 at September 30, 2014 and December 31, 2013	86,565	65,667
Income tax receivable	3,744	6,943
Deferred tax assets	3,803	16,293
Restricted cash	48,050	3,493
Other current assets	24,443	23,507
Total current assets	992,367	1,241,399
Long-term marketable securities	319,115	416,474
Goodwill	675,324	227,989
Other intangible assets, net	76,479	18,282
Property and equipment, net	307,387	348,793
Other long-term assets	20,704	26,148
Total assets	2,391,376	2,279,085
Current liabilities:	'	'
Accounts payable	15,439	20,973
Other current liabilities	153,956	68,866
Deferred revenue	198,688	186,663
Total current liabilities	368,083	276,502
Deferred revenue	5,312	3,252
Deferred tax liabilities	8,458	'
Other non-current liabilities	78,639	122,060
Total liabilities	460,492	401,814
Stockholders' equity:	'	'
Common stock, $0.00000625 par value, and additional paid in capital - authorized shares: 2,020,517; shares outstanding: 902,012 shares (Class A, 766,592, Class B, 114,903, Class C, 20,517) as of September 30, 2014 and 832,309 (Class A, 685,554, Class B, 126,238, Class C, 20,517) as of December 31, 2013	3,062,186	2,823,743
Accumulated other comprehensive income (loss)	-4,510	-1,046
Accumulated deficit	-1,126,792	-945,426
Total stockholders' equity	1,930,884	1,877,271
Total liabilities and stockholders' equity	$2,391,376	$2,279,085

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Per 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	2,020,517
Common stock, shares outstanding	902,012	832,309
Common Class A [Member]	'	'
Common stock, shares outstanding	766,592	685,554
Common Class B [Member]	'	'
Common stock, shares outstanding	114,903	126,238
Common Class C [Member]	'	'
Common stock, shares outstanding	20,517	20,517

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:	'	'	'	'
Online game	$139,372	$174,370	$402,608	$607,262
Advertising and other	37,239	28,210	95,255	89,642
Total revenue	176,611	202,580	497,863	696,904
Costs and expenses:	'	'	'	'
Cost of revenue	53,286	59,011	158,078	189,482
Research and development	100,113	81,023	291,419	334,526
Sales and marketing	44,005	21,170	115,466	79,640
General and administrative	38,536	34,012	128,703	121,193
Impairment of intangible assets	'	10,217	'	10,217
Total costs and expenses	235,940	205,433	693,666	735,058
Income (loss) from operations	-59,329	-2,853	-195,803	-38,154
Interest income	841	965	2,487	3,233
Other income (expense), net	647	929	2,668	-4,465
Income (loss) before income taxes	-57,841	-959	-190,648	-39,386
Provision for (benefit from) income taxes	-783	-891	-9,874	-27,646
Net income (loss)	($57,058)	($68)	($180,774)	($11,740)
Net income (loss) per share:	'	'	'	'
Basic	($0.06)	$0	($0.21)	($0.01)
Diluted	($0.06)	$0	($0.21)	($0.01)
Weighted average common shares used to compute net income (loss) per share:	'	'	'	'
Basic	884,021	804,129	869,178	791,032
Diluted	884,021	804,129	869,178	791,032

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Partners' Capital [Abstract]	'	'	'	'
Net income (loss)	($57,058)	($68)	($180,774)	($11,740)
Other comprehensive income (loss):	'	'	'	'
Change in foreign currency translation adjustment	-21,368	179	-3,055	-1,280
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	-272	1,187	-409	-241
Net change on unrealized gains (losses) on derivative instruments	'	'	'	2,423
Other comprehensive income (loss)	-21,640	1,366	-3,464	902
Comprehensive income (loss)	($78,698)	$1,298	($184,238)	($10,838)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating activities:	'	'
Net income (loss)	($180,774)	($11,740)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Depreciation and amortization	64,553	96,905
Stock-based expense	93,468	65,066
(Gain) loss from sales of investments, assets and other, net	2,131	7,437
Tax benefits from stock-based awards	'	-10,792
Excess tax benefits from stock-based awards	'	10,792
Accretion and amortization on marketable securities	7,783	14,310
Deferred income taxes	-10,113	-18,253
Impairment of intangible assets	'	10,217
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-13,443	39,902
Income tax receivable	3,200	-469
Other assets	-3,860	194
Accounts payable	-5,919	-2,728
Deferred revenue	13,838	-127,405
Other liabilities	20,280	-52,494
Net cash provided by (used in) operating activities	-8,856	20,942
Investing activities:	'	'
Purchases of marketable securities	-617,256	-821,942
Sales of marketable securities	170,943	234,901
Maturities of marketable securities	496,763	699,418
Acquisition of property and equipment	-7,078	-7,344
Business acquisition, net of cash acquired	-391,711	-18,054
Proceeds from sale of property and equipment	5,059	'
Restricted cash	'	227
Other investing activities, net	357	228
Net cash provided by (used in) investing activities	-342,923	87,434
Financing activities:	'	'
Taxes paid related to net share settlement of equity awards	-963	-1,031
Repurchases of common stock	'	-9,302
Proceeds from exercise of stock options	9,410	6,430
Proceeds from employee stock purchase plan	6,318	7,892
Excess tax benefits from stock-based awards	'	-10,792
Repayment of debt	'	-100,000
Net cash provided by (used in) financing activities	14,765	-106,803
Effect of exchange rate changes on cash and cash equivalents	-231	-804
Net increase (decrease) in cash and cash equivalents	-337,245	769
Cash and cash equivalents, beginning of period	465,523	385,949
Cash and cash equivalents, end of period	$128,278	$386,718

Overview_and_Summary_of_Signif

Overview and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
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.
	Unaudited Interim Financial Information
	The accompanying interim consolidated balance sheet as of September 30, 2014, the interim consolidated statements of operations and, the interim consolidated statements of comprehensive income (loss) for the three and nine months ended September 30, 2014 and 2013, and the interim consolidated statements of cash flows for the nine months ended September 30, 2014 and 2013 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 and nine months ended September 30, 2014 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 nine months ended September 30, 2014 for various games resulted in a decrease in revenue and income from continuing operations of $0.8 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. These changes in estimates did not impact our reported earnings per share for the nine months ended September 30, 2014. There was no material impact to revenue recognized in the third quarter of 2014 from changes in our estimated average life of durable goods.
	Accounting Policy Updates
	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, 2013.
	In June 2013, the Financial Accounting Standards Board ratified Accounting Standards Update 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” which concludes an unrecognized tax benefit should be presented as a reduction of a deferred tax asset when settlement in this manner is available under the tax law. We adopted this amendment in the first quarter of 2014, which resulted in a reduction of non-current liabilities of $33.3 million.
	In May 2014, the Financial Accounting Standards Board 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)” and is effective in the first quarter of 2017. Early adoption is not permitted. 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	9 Months Ended
	Sep. 30, 2014
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):
		September 30, 2014
		Amortized		Gross		Gross			Aggregate
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	U.S. government and government agency debt securities	$	429,462	$	162	$	(115	)	$	429,509
	Corporate debt securities		575,425		112		(355	)		575,182
	Municipal securities		11,908		—		—			11,908
	Total	$	1,016,795	$	274	$	(470	)	$	1,016,599
		31-Dec-13
		Amortized		Gross		Gross			Aggregate
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	U.S. government and government agency debt securities	$	333,632	$	160	$	(51	)	$	333,741
	Corporate debt securities		731,225		356		(257	)		731,324
	Municipal securities		11,376		6		—			11,382
	Total	$	1,076,233	$	522	$	(308	)	$	1,076,447
	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):
		September 30, 2014
	Due within one year	$	697,484
	After one year through three years		319,115
	Total	$	1,016,599
	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 September 30, 2014, we had unrealized losses of $0.5 million related to marketable securities that had a fair value of $539.0 million. As of December 31, 2013, we had unrealized losses of $0.3 million related to marketable securities that had a fair value of $240.9 million. None of these securities were in a continuous unrealized loss position for more than 12 months.
	As of September 30, 2014 and December 31, 2013, 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 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	9 Months Ended
	Sep. 30, 2014
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”). The amount payable is contingent upon the achievement of certain performance milestones for each of Spooky Cool’s fiscal years ended June 30, 2014 and June 30, 2015. Under the terms of the agreement, the maximum amount that could be earned and payable by us is $100 million. As of September 30, 2014, based on our updated assessment of Spooky Cool’s expected performance, the maximum amount currently achievable and payable by us is $60 million.
	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. In the third quarter of 2014, we updated this analysis based on our updated projections and recorded the change in estimated fair value of the contingent consideration liability as an expense of approximately $6.8 million within research and development expense in our consolidated statement of operations. The significant unobservable inputs used in the fair value measurement of the acquisition-related contingent consideration payable are forecasted future cash flows and the timing of those cash flows. Significant changes in actual and forecasted future cash flows may result in significant charges or benefits to our future operating expenses.
	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):
			September 30, 2014
			Level 1			Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	41,957		$	—	$	—	$	41,957
	U.S. government and government agency debt securities			—			429,509		—		429,509
	Corporate debt securities			—			575,182		—		575,182
	Municipal securities			—			11,908		—		11,908
	Total		$	41,957		$	1,016,599	$	—	$	1,058,556
	Liabilities:
	Contingent consideration		$	—		$	—	$	31,820	$	31,820
			31-Dec-13
			Level 1			Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	349,421		$	—	$	—	$	349,421
	U.S. government and government agency debt securities			—			333,741		—		333,741
	Corporate debt securities			—			731,324		—		731,324
	Municipal securities			—			11,382		—		11,382
	Total		$	349,421		$	1,076,447	$	—	$	1,425,868
	Liabilities:
	Contingent consideration		$	—		$	—	$	11,720	$	11,720
		-1	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	4. Property and Equipment
	Property and equipment consist of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Computer equipment	$	141,464		$	225,063
	Software		31,662			27,668
	Land		89,130			89,130
	Building		194,351			192,512
	Furniture and fixtures		10,775			11,303
	Leasehold improvements		9,706			11,695
			477,088			557,371
	Less accumulated depreciation		(169,701	)		(208,578	)
	Total property and equipment, net	$	307,387		$	348,793

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	5. Acquisitions
	On February 11, 2014, we acquired 100% of the outstanding stock of NaturalMotion, a provider of games for mobile phones and tablets domiciled in the U.K. We acquired NaturalMotion to leverage their strong portfolio of technology, assembled workforce and existing mobile games in order to expand and enhance our game offerings particularly on mobile platforms. The acquisition date fair value of the purchase consideration was $522.2 million, which included the following:
		Fair Value of Purchase
		Consideration,
		in thousands
	Cash	$	391,000
	Common stock (28,178,201 shares)		130,465
	Fair value of stock options assumed		693
	Total	$	522,158
	The value of the purchase consideration attributed to the 28.2 million common shares issued was based on a $4.63 closing price of the Company’s Class A Common Stock on the date of the closing of the acquisition.
	The following table summarizes the preliminary acquisition date fair value of net tangible assets acquired and liabilities assumed from NaturalMotion (in thousands, unaudited):
		Preliminary			Preliminary Estimated
		Estimated Fair Value,			Weighted Average Useful Life
		in thousands
	Tangible net assets (liabilities) assumed	$	(2,648	)		N/A
	Intangible assets
	Developed technology		59,900			3 years
	Branding and trade names		15,000			4.6 years
	Goodwill		449,906			N/A
	Total	$	522,158
	Goodwill, which is partially deductible for U.S. income tax purposes, represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired, and is primarily attributable to the assembled workforce of the acquired business and expected synergies at the time of the acquisition. The preliminary fair values of net tangible assets acquired and liabilities assumed are management’s estimates based on the information available at the acquisition date.
	The information above provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed, however, the preliminary measurements of fair value are subject to change including in the area of income taxes payable and deferred taxes which may change subject to the completion of certain tax returns.
	On the acquisition date, we assumed unvested NaturalMotion employee stock options and exchanged them for options to purchase shares of our Class A Common Stock with a preliminary fair value of $29.7 million. $0.7 million of this value was allocated to purchase consideration and the remaining $29.0 million was allocated to future compensation expense which will be recorded as stock-based expense over the vesting period of the awards. Also on the acquisition date, we granted to continuing employees 11.6 million shares of our Class A Common Stock that vest over a period of three years from the grant date, subject to continued employment with Zynga. The value of these shares on the acquisition date was $53.6 million and will be recorded as stock-based expense over the requisite service period in accordance with the vesting terms. Transaction costs incurred by the Company in connection with the acquisition, including professional fees and transaction taxes, were $6.4 million and are included in our statement of operations for the nine months ended September 30, 2014.
	The amounts of revenue and net loss of NaturalMotion included in the Company’s condensed consolidated statement of operations for the post acquisition period from February 12, 2014 to September 30, 2014 are as follows (unaudited, in thousands):
		February 12, 2014 to
		September 30, 2014
	Total revenues	$	14,721
	Net loss	$	56,434
	The net loss includes approximately $20.3 million of stock-based expense and $14.0 million related to the amortization of acquired intangibles, net of tax.
	The following pro forma financial information summarizes the combined results of operations for the Company and NaturalMotion, which was significant for the purposes of unaudited pro forma financial information disclosure, as though the companies were combined as of the beginning of the Company’s fiscal years presented.
	The pro forma financial information was as follows (unaudited, in thousands):
		Nine Months Ended September 30,
		2014			2013
	Total revenues	$	504,982		$	721,240
	Net loss	$	(188,811	)	$	(56,104	)
	The pro forma financial information for all periods presented has been calculated after adjusting the results of NaturalMotion to reflect the business combination accounting effects resulting from this acquisition including fair value adjustments resulting from purchase accounting, the amortization expenses from acquired intangible assets, the stock-based compensation expense for unvested stock options assumed and restricted stock awards granted and the related tax effects as though the acquisition occurred as of the beginning of the periods presented. The pro forma financial information is for informational purposes only and is not indicative of the results of operations that would have been achieved based on these assumptions.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	6. Goodwill and Other Intangible Assets
	Changes in the carrying value of goodwill from December 31, 2013 to September 30, 2014 are as follows (in thousands):
	Goodwill – December 31, 2013	$	227,989
	Additions		450,130
	Foreign currency translation adjustments		(2,795	)
	Goodwill – September 30, 2014	$	675,324
		Gross Carrying			Accumulated			Net Book
		Value			Amortization			Value
	Developed technology	$	154,615		$	(88,906	)	$	65,709
	Trademarks, branding and domain names		16,292			(7,325	)		8,967
	Acquired lease intangibles		5,708			(3,905	)		1,803
	Total	$	176,615		$	(100,136	)	$	76,479
	These assets were, and continue to be, amortized on a straight-line basis. As of September 30, 2014, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2014	$	7,290
	2015		28,032
	2016		25,681
	2017 and thereafter		9,356
	Total	$	70,359

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	The benefit from income taxes decreased by $0.1 million and $17.8 million in the three and nine months ended September 30, 2014, respectively, as compared to the same period of the prior year. The decrease in the nine months ended September 30, 2014 is attributable primarily to the incremental benefit of $5.0 million recorded in the first quarter of 2013 related to the recognition of Federal research and development tax credits and the net benefit related to changes in the estimated jurisdictional mix of earnings between the two periods of $12.8 million.
	During 2012, we completed the implementation of our international structure, which resulted in a significant loss outside of the U.S for which no benefit was recorded. If 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	9 Months Ended
	Sep. 30, 2014
Other Liabilities Disclosure [Abstract]	'
Other Current Liabilities	'
	8. Other Current Liabilities
	Other current liabilities consist of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Accrued escrow for acquisitions	$	47,913	$	6,122
	Contingent consideration liability		31,820		—
	Accrued compensation liability		21,444		10,185
	Accrued restructuring liability		11,140		6,751
	Other current liabilities		41,639		45,808
	Total other current liabilities	$	153,956	$	68,866
	Other current liabilities include various expenses that we accrue for transaction taxes, customer deposits and accrued accounts payable.

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Restructuring	'
	9. Restructuring
	During the nine months ended September 30, 2014, we recorded a total restructuring charge of $27.7 million which was classified within our consolidated statement of operations as follows: Cost of Revenue $1.2 million, Research and Development $9.6 million, Sales and Marketing $1.5 million and General and Administrative $15.4 million.
	Q1 2014 Restructuring Plan
	During the three months ended March 31, 2014, our board of directors authorized, and we implemented a restructuring plan that included a reduction in work force and the closure of certain office and data center facilities as part of an overall plan to better align our cost structure against market opportunities. As a result of this restructuring, we recorded a charge of $27.7 million in the nine months ended September 30, 2014, which is included in operating expenses in our consolidated statement of operations. The $27.7 million restructuring charge in the nine months ended September 30, 2014 is comprised of $13.4 million of employee severance costs and $14.3 million related to the closure of certain offices and data center facilities. This restructuring charge does not include the impact of $2.4 million of net stock-based expense reversals associated with the net effect of forfeitures from employee terminations and the acceleration of unvested stock awards which were recorded in stock-based expense. The remaining liability related to our Q1 2014 restructuring plan as of September 30, 2014 was $12.8 million and is expected to be paid out over the next 2.3 years.
	The following table presents the activity for the three months ended March 31, 2014 and June 30, 2014 and the three and nine months ended September 30, 2014 related to the Q1 2014 restructuring plan (in thousands):
			Three Months Ended									Nine Months Ended
			March 31, 2014			June 30, 2014			September 30, 2014			September 30, 2014
	Restructuring liability - beginning of period		$	—		$	21,036		$	14,006		$	—
	Restructuring expense and adjustments			29,894			(2,314	)(1)		308			27,888
	Cash payments			(8,858	)		(4,716	)		(1,519	)		(15,093	)
	Restructuring liability (Q1 2014 Plan) - end of period		$	21,036		$	14,006		$	12,795		$	12,795
	-1	A $2.3 million adjustment was recorded in the second quarter of 2014 to reduce our restructuring liability as a result of executing a sublease agreement with a new tenant in a data center facility we had previously vacated in the first quarter of 2014.
	Other Plans
	The following table presents the activity for the three months ended March 31, 2014 and June 30, 2014 and the three and nine months ended September 30, 2014 related to all other remaining historical restructuring plans from prior years (in thousands):
			Three Months Ended									Nine Months Ended
			March 31, 2014			June 30, 2014			September 30, 2014			September 30, 2014
	Restructuring liability - beginning of period		$	13,561		$	9,813		$	8,128		$	13,561
	Restructuring expense and adjustments			(239	)		44			(21	)		(216	)
	Cash payments			(3,509	)		(1,729	)		(1,096	)		(6,334	)
	Restructuring liability (2013 Plan) - end of period		$	9,813		$	8,128		$	7,011		$	7,011
	The remaining liability of $7.0 million is expected to be paid out over the next 3.0 years.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stockholders' Equity	'
	10. 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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Cost of revenue	$	1,110		$	(645	)	$	3,391		$	(351	)
	Research and development		24,281			10,119			60,293			46,907
	Sales and marketing		1,187			2,941			4,505			8,327
	General and administrative		9,717			(3,159	)		25,279			10,183
	Total stock-based expense	$	36,295		$	9,256		$	93,468		$	65,066
	The following table shows stock option activity for the nine months ended September 30, 2014 (in thousands, except weighted-average exercise price and weighted-average contractual term):
		Outstanding Options
		Stock Options			Weighted-			Aggregate			Weighted-
					Average			Intrinsic Value of			Average
					Exercise			Stock Options			Contractual Term
					Price			Outstanding			(in years)
	Balance as of December 31, 2013		41,081		$	2.07		$	83,089			7.02
	Granted		13,163			2.41
	Forfeited and cancelled		(4,374	)		3.16
	Exercised		(8,491	)		1.16
	Balance as of September 30, 2014		41,379		$	2.25		$	49,299			7.06
	The following table shows a summary of ZSU activity for the nine months ended September 30, 2014 (in thousands, except weighted-average grant date fair value):
		Outstanding ZSUs
		Shares			Weighted-			Aggregate
					Average Grant Date			Intrinsic Value of
					Fair Value			Unvested ZSUs
	Unvested as of December 31, 2013		66,997		$	4.96		$	254,589
	Granted		33,731			3.87
	Vested		(19,411	)		5.27
	Forfeited and cancelled		(22,654	)		4.66
	Unvested as of September 30, 2014		58,663		$	4.34		$	158,390
	The following table shows a summary of changes in accumulated other comprehensive income by component for the three and nine months ended September 30, 2014 (in thousands):
		Foreign Currency			Unrealized Gains			Total
		Translation			(Losses) on Available-
					for-Sale Securities
	Balance as of June 30, 2014	$	17,054		$	76		$	17,130
	Other comprehensive income (loss) before reclassifications		(21,368	)		(283	)		(21,651	)
	Amounts reclassified from accumulated other comprehensive income		—			11			11
	Net current-period other comprehensive income (loss)		(21,368	)		(272	)		(21,640	)
	Balance as of September 30, 2014	$	(4,314	)	$	(196	)	$	(4,510	)
		Foreign Currency			Unrealized Gains			Total
		Translation			(Losses) on Available-
					for-Sale Securities
	Balance as of December 31, 2013	$	(1,259	)	$	213		$	(1,046	)
	Other comprehensive income (loss) before reclassifications		(3,055	)		(403	)		(3,458	)
	Amounts reclassified from accumulated other comprehensive income		—			(6	)		(6	)
	Net current-period other comprehensive income (loss)		(3,055	)		(409	)		(3,464	)
	Balance as of September 30, 2014	$	(4,314	)	$	(196	)	$	(4,510	)
	In October 2012, our board of directors authorized a $200 million stock repurchase program. We initiated purchases under this program in December 2012. As of September 30, 2014, the remaining authorized amount of stock repurchases that may be made under this plan was $178.9 million. The program expired on October 31, 2014. We did not repurchase any shares in the three months ended September 30, 2014.

Net_Income_Loss_Per_Share_of_C

Net Income (Loss) Per Share of Common Stock	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share of Common Stock	'
	11. 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 September 30,
		2014									2013
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(48,121	)	$	(7,613	)	$	(1,324	)	$	(54	)	$	(12	)	$	(2	)
	Weighted-average common shares outstanding		745,558			117,946			20,517			639,360			144,252			20,517
	Basic net income (loss) per share	$	(0.06	)	$	(0.06	)	$	(0.06	)	$	0		$	0		$	0
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(48,121	)	$	(7,613	)	$	(1,324	)	$	(54	)	$	(12	)	$	(2	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(1,324	)		—			—			(2	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(7,613	)		—			—			(12	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(57,058	)	$	(7,613	)	$	(1,324	)	$	(68	)	$	(12	)	$	(2	)
	Weighted-average common shares outstanding-basic		745,558			117,946			20,517			639,360			144,252			20,517
	Conversion of Class C to Class A common shares		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares		117,946			—			—			144,252			—			—
	Weighted-average common shares outstanding-diluted		884,021			117,946			20,517			804,129			144,252			20,517
	Diluted net income (loss) per share	$	(0.06	)	$	(0.06	)	$	(0.06	)	$	0		$	0		$	0
		Nine Months Ended September 30,
		2014									2013
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(151,292	)	$	(25,215	)	$	(4,267	)	$	(9,102	)	$	(2,333	)	$	(305	)
	Weighted-average common shares outstanding		727,425			121,236			20,517			613,323			157,192			20,517
	Basic net income per share	$	(0.21	)	$	(0.21	)	$	(0.21	)	$	(0.01	)	$	(0.01	)	$	(0.01	)
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(151,292	)	$	(25,215	)	$	(4,267	)	$	(9,102	)	$	(2,333	)	$	(305	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(4,267	)		—			—			(305	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(25,215	)		—			—			(2,333	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(180,774	)	$	(25,215	)	$	(4,267	)	$	(11,740	)	$	(2,333	)	$	(305	)
	Weighted-average common shares outstanding-basic		727,425			121,236			20,517			613,323			157,192			20,517
	Conversion of Class C to Class A common shares outstanding		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares outstanding		121,236			—			—			157,192			—			—
	Number of shares used in diluted net income (loss) per share		869,178			121,236			20,517			791,032			157,192			20,517
	Diluted net income (loss) per share	$	(0.21	)	$	(0.21	)	$	(0.21	)	$	(0.01	)	$	(0.01	)	$	(0.01	)
	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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Stock options		42,726			60,320			43,206			65,803
	Warrants		—			695			—			695
	Restricted shares		13,763			3,649			12,333			4,439
	ZSUs		51,550			63,448			56,484			61,326
	Total		108,039			128,112			112,023			132,263

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	12. Commitments and Contingencies
	Lease Commitments
	We have entered into operating leases for facilities, including data center space. As of September 30, 2014, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2014	$	5,449
	2015		27,950
	2016		22,607
	2017		13,026
	2018		11,788
	2019 and thereafter		33,964
		$	114,784
	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 September 30, 2014, we have not drawn down any amounts under the credit facility and are 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. The Company filed a motion to dismiss the First Amended Complaint on May 2, 2014, and briefing on the motion was completed in June 2014. On September 15, 2014, the court issued an order vacating the previously scheduled hearing and taking the motions under submission.
	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 October 23, 2014, the Court of Appeal issued an order requesting additional briefing on the petition. On November 3, 2014, the plaintiff filed a preliminary opposition to the writ petition. The defendants’ reply brief in support of the writ petition is due on November 10, 2014. A case management conference in the trial court had been scheduled for November 5, 2014 to discuss the schedule for further proceedings, including the schedule for briefing on the plaintiff’s motion for class certification. On November 3, 2014, the court issued an order vacating the previously scheduled case management conference and instructing the parties to contact the court on November 10, 2014 to propose a new date.
	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 Company filed a motion to dismiss the amended complaint and a motion to stay discovery while the motion to dismiss is pending. A hearing on the motions was held on August 22, 2014, and the court took the motions under submission.
	The Company believes it has meritorious defenses in the above securities class actions and will vigorously defend these actions.
	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.
	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.
	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.
	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.
	On March 16, 2012, Spear & Sons Limited (“Spear”) filed suit against the Company and Zynga UK Limited before the Paris Civil Court (Tribunal de Grande Instance), claiming that the Company’s Words with Friends game infringed Spear’s copyright and trademark in relation to its Scrabble game, as well as committed acts of commercial poaching. Spear sought damages and an injunction barring the Company from offering the Words with Friends game for sale in France. On May 30, 2012, the Company entered an appearance in the action and challenged the court’s jurisdiction to hear the alleged claims. The court ruled that it would consider whether it had jurisdiction to hear the claims before considering any substantive claims. On October 11, 2012, the court ruled that it did have jurisdiction to hear the claims. On October 31, 2012, the Company filed a notice of appeal regarding the issue of jurisdiction, and the court stayed the lower-court action pending the appeal. On October 18, 2013, the appellate court affirmed the lower court’s denial of the Company’s jurisdictional challenge. On March 7, 2014, the Company filed a further appeal regarding jurisdiction to the French supreme court. The Company expects a ruling from the supreme court on this issue in mid to late 2015.
	The lower court ordered that the case proceed on the merits notwithstanding the pending appeal. The parties proceeded with briefing their respective positions. On October 9, 2014, Spear filed an additional brief requesting that the French court grant a European Union-wide injunction barring Zynga from offering the Words With Friends game and the tile used in the game. Spear filed its final brief on October 16, 2014, which included a demand for damages in the amount of EUR 650,000 and reimbursement of attorneys’ fees in the amount of EUR 250,000. The Company filed its final brief on October 21, 2014, which included a rebuttal to Spear’s new request for a European Union-wide injunction. Oral arguments on the merits of the alleged claims were heard on November 5, 2014. The court indicated it would issue a ruling on January 15, 2015.
	The Company believes it has meritorious defenses in the above lawsuit filed by Spear and will vigorously defend the action.
	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	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Geographical Information	'
	13. Geographical Information
	The following represents our revenue based on the geographic location of our players (in thousands):
	Revenue
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
	United States		$	110,308	$	122,648	$	301,168	$	416,984
	All other countries (1)			66,303		79,932		196,695		279,920
	Total revenue		$	176,611	$	202,580	$	497,863	$	696,904
		(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
			September 30,		December 31,
			2014		2013
	United States		$	303,773	$	345,598
	All other countries			3,614		3,195
	Total property and equipment, net		$	307,387	$	348,793

Overview_and_Summary_of_Signif1

Overview and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
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.
Unaudited Interim Financial Information	'
	Unaudited Interim Financial Information
	The accompanying interim consolidated balance sheet as of September 30, 2014, the interim consolidated statements of operations and, the interim consolidated statements of comprehensive income (loss) for the three and nine months ended September 30, 2014 and 2013, and the interim consolidated statements of cash flows for the nine months ended September 30, 2014 and 2013 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 and nine months ended September 30, 2014 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 nine months ended September 30, 2014 for various games resulted in a decrease in revenue and income from continuing operations of $0.8 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. These changes in estimates did not impact our reported earnings per share for the nine months ended September 30, 2014. There was no material impact to revenue recognized in the third quarter of 2014 from changes in our estimated average life of durable goods.
Accounting Policy Updates	'
	Accounting Policy Updates
	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, 2013.
	In June 2013, the Financial Accounting Standards Board ratified Accounting Standards Update 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” which concludes an unrecognized tax benefit should be presented as a reduction of a deferred tax asset when settlement in this manner is available under the tax law. We adopted this amendment in the first quarter of 2014, which resulted in a reduction of non-current liabilities of $33.3 million.
	In May 2014, the Financial Accounting Standards Board 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)” and is effective in the first quarter of 2017. Early adoption is not permitted. 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”). The amount payable is contingent upon the achievement of certain performance milestones for each of Spooky Cool’s fiscal years ended June 30, 2014 and June 30, 2015. Under the terms of the agreement, the maximum amount that could be earned and payable by us is $100 million. As of September 30, 2014, based on our updated assessment of Spooky Cool’s expected performance, the maximum amount currently achievable and payable by us is $60 million.
	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. In the third quarter of 2014, we updated this analysis based on our updated projections and recorded the change in estimated fair value of the contingent consideration liability as an expense of approximately $6.8 million within research and development expense in our consolidated statement of operations. The significant unobservable inputs used in the fair value measurement of the acquisition-related contingent consideration payable are forecasted future cash flows and the timing of those cash flows. Significant changes in actual and forecasted future cash flows may result in significant charges or benefits to our future operating expenses.
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)	9 Months Ended
	Sep. 30, 2014
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):
		September 30, 2014
		Amortized		Gross		Gross			Aggregate
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	U.S. government and government agency debt securities	$	429,462	$	162	$	(115	)	$	429,509
	Corporate debt securities		575,425		112		(355	)		575,182
	Municipal securities		11,908		—		—			11,908
	Total	$	1,016,795	$	274	$	(470	)	$	1,016,599
		31-Dec-13
		Amortized		Gross		Gross			Aggregate
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	U.S. government and government agency debt securities	$	333,632	$	160	$	(51	)	$	333,741
	Corporate debt securities		731,225		356		(257	)		731,324
	Municipal securities		11,376		6		—			11,382
	Total	$	1,076,233	$	522	$	(308	)	$	1,076,447
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):
		September 30, 2014
	Due within one year	$	697,484
	After one year through three years		319,115
	Total	$	1,016,599

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
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):
			September 30, 2014
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	41,957	$	—	$	—	$	41,957
	U.S. government and government agency debt securities			—		429,509		—		429,509
	Corporate debt securities			—		575,182		—		575,182
	Municipal securities			—		11,908		—		11,908
	Total		$	41,957	$	1,016,599	$	—	$	1,058,556
	Liabilities:
	Contingent consideration		$	—	$	—	$	31,820	$	31,820
			31-Dec-13
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds (1)		$	349,421	$	—	$	—	$	349,421
	U.S. government and government agency debt securities			—		333,741		—		333,741
	Corporate debt securities			—		731,324		—		731,324
	Municipal securities			—		11,382		—		11,382
	Total		$	349,421	$	1,076,447	$	—	$	1,425,868
	Liabilities:
	Contingent consideration		$	—	$	—	$	11,720	$	11,720
		-1	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment_Tables

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Components of Property and Equipment	'
	Property and equipment consist of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Computer equipment	$	141,464		$	225,063
	Software		31,662			27,668
	Land		89,130			89,130
	Building		194,351			192,512
	Furniture and fixtures		10,775			11,303
	Leasehold improvements		9,706			11,695
			477,088			557,371
	Less accumulated depreciation		(169,701	)		(208,578	)
	Total property and equipment, net	$	307,387		$	348,793

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value of Purchase Consideration	'
	The acquisition date fair value of the purchase consideration was $522.2 million, which included the following:
		Fair Value of Purchase
		Consideration, in
		thousands
	Cash	$	391,000
	Common stock (28,178,201 shares)		130,465
	Fair value of stock options assumed		693
	Total	$	522,158
Schedule of Purchase Price Allocation	'
	The following table summarizes the preliminary acquisition date fair value of net tangible assets acquired and liabilities assumed from NaturalMotion (in thousands, unaudited):
		Preliminary			Preliminary Estimated
		Estimated Fair Value,			Weighted Average Useful Life
		in thousands
	Tangible net assets (liabilities) assumed	$	(2,648	)		N/A
	Intangible assets
	Developed technology		59,900			3 years
	Branding and trade names		15,000			4.6 years
	Goodwill		449,906			N/A
	Total	$	522,158
Pro Forma Financial Information	'
	The pro forma financial information was as follows (unaudited, in thousands):
		Nine Months Ended September 30,
		2014			2013
	Total revenues	$	504,982		$	721,240
	Net loss	$	(188,811	)	$	(56,104	)
NaturalMotion, Ltd. [Member]	'
Schedule of Revenues and Earnings of Acquired Entity Post Acquisition Period	'
	The amounts of revenue and net loss of NaturalMotion included in the Company’s condensed consolidated statement of operations for the post acquisition period from February 12, 2014 to September 30, 2014 are as follows (unaudited, in thousands):
		February 12, 2014 to
		September 30, 2014
	Total revenues	$	14,721
	Net loss	$	56,434

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Changes in the carrying value of goodwill from December 31, 2013 to September 30, 2014 are as follows (in thousands):
	Goodwill – December 31, 2013	$	227,989
	Additions		450,130
	Foreign currency translation adjustments		(2,795	)
	Goodwill – September 30, 2014	$	675,324
Acquisition-Related Intangible Assets	'
		Gross Carrying			Accumulated			Net Book
		Value			Amortization			Value
	Developed technology	$	154,615		$	(88,906	)	$	65,709
	Trademarks, branding and domain names		16,292			(7,325	)		8,967
	Acquired lease intangibles		5,708			(3,905	)		1,803
	Total	$	176,615		$	(100,136	)	$	76,479
Schedule of Finite Lived Intangible Assets Future Amortization Expense	'
	As of September 30, 2014, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2014	$	7,290
	2015		28,032
	2016		25,681
	2017 and thereafter		9,356
	Total	$	70,359

Other_Current_Liabilities_Tabl

Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2014
Other Liabilities Disclosure [Abstract]	'
Schedule of Other Current Liabilities	'
	Other current liabilities consist of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Accrued escrow for acquisitions	$	47,913	$	6,122
	Contingent consideration liability		31,820		—
	Accrued compensation liability		21,444		10,185
	Accrued restructuring liability		11,140		6,751
	Other current liabilities		41,639		45,808
	Total other current liabilities	$	153,956	$	68,866

Restructuring_Tables

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Summary of Historical Restructuring Liability	'
	The following table presents the activity for the three months ended March 31, 2014 and June 30, 2014 and the three and nine months ended September 30, 2014 related to the Q1 2014 restructuring plan (in thousands):
			Three Months Ended									Nine Months Ended
			March 31, 2014			June 30, 2014			September 30, 2014			September 30, 2014
	Restructuring liability - beginning of period		$	—		$	21,036		$	14,006		$	—
	Restructuring expense and adjustments			29,894			(2,314	)(1)		308			27,888
	Cash payments			(8,858	)		(4,716	)		(1,519	)		(15,093	)
	Restructuring liability (Q1 2014 Plan) - end of period		$	21,036		$	14,006		$	12,795		$	12,795
	-1	A $2.3 million adjustment was recorded in the second quarter of 2014 to reduce our restructuring liability as a result of executing a sublease agreement with a new tenant in a data center facility we had previously vacated in the first quarter of 2014.
	Other Plans
	The following table presents the activity for the three months ended March 31, 2014 and June 30, 2014 and the three and nine months ended September 30, 2014 related to all other remaining historical restructuring plans from prior years (in thousands):
			Three Months Ended									Nine Months Ended
			March 31, 2014			June 30, 2014			September 30, 2014			September 30, 2014
	Restructuring liability - beginning of period		$	13,561		$	9,813		$	8,128		$	13,561
	Restructuring expense and adjustments			(239	)		44			(21	)		(216	)
	Cash payments			(3,509	)		(1,729	)		(1,096	)		(6,334	)
	Restructuring liability (2013 Plan) - end of period		$	9,813		$	8,128		$	7,011		$	7,011

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Cost of revenue	$	1,110		$	(645	)	$	3,391		$	(351	)
	Research and development		24,281			10,119			60,293			46,907
	Sales and marketing		1,187			2,941			4,505			8,327
	General and administrative		9,717			(3,159	)		25,279			10,183
	Total stock-based expense	$	36,295		$	9,256		$	93,468		$	65,066
Schedule of Share Based Compensation Stock Option Activity	'
	The following table shows stock option activity for the nine months ended September 30, 2014 (in thousands, except weighted-average exercise price and weighted-average contractual term):
		Outstanding Options
		Stock Options			Weighted-			Aggregate			Weighted-
					Average			Intrinsic Value of			Average
					Exercise			Stock Options			Contractual Term
					Price			Outstanding			(in years)
	Balance as of December 31, 2013		41,081		$	2.07		$	83,089			7.02
	Granted		13,163			2.41
	Forfeited and cancelled		(4,374	)		3.16
	Exercised		(8,491	)		1.16
	Balance as of September 30, 2014		41,379		$	2.25		$	49,299			7.06
Schedule of Share Based Compensation Restricted Stock Units Award Activity	'
	The following table shows a summary of ZSU activity for the nine months ended September 30, 2014 (in thousands, except weighted-average grant date fair value):
		Outstanding ZSUs
		Shares			Weighted-			Aggregate
					Average Grant Date			Intrinsic Value of
					Fair Value			Unvested ZSUs
	Unvested as of December 31, 2013		66,997		$	4.96		$	254,589
	Granted		33,731			3.87
	Vested		(19,411	)		5.27
	Forfeited and cancelled		(22,654	)		4.66
	Unvested as of September 30, 2014		58,663		$	4.34		$	158,390
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 and nine months ended September 30, 2014 (in thousands):
		Foreign Currency			Unrealized Gains			Total
		Translation			(Losses) on Available-
					for-Sale Securities
	Balance as of June 30, 2014	$	17,054		$	76		$	17,130
	Other comprehensive income (loss) before reclassifications		(21,368	)		(283	)		(21,651	)
	Amounts reclassified from accumulated other comprehensive income		—			11			11
	Net current-period other comprehensive income (loss)		(21,368	)		(272	)		(21,640	)
	Balance as of September 30, 2014	$	(4,314	)	$	(196	)	$	(4,510	)
		Foreign Currency			Unrealized Gains			Total
		Translation			(Losses) on Available-
					for-Sale Securities
	Balance as of December 31, 2013	$	(1,259	)	$	213		$	(1,046	)
	Other comprehensive income (loss) before reclassifications		(3,055	)		(403	)		(3,458	)
	Amounts reclassified from accumulated other comprehensive income		—			(6	)		(6	)
	Net current-period other comprehensive income (loss)		(3,055	)		(409	)		(3,464	)
	Balance as of September 30, 2014	$	(4,314	)	$	(196	)	$	(4,510	)

Net_Income_Loss_Per_Share_of_C1

Net Income (Loss) Per Share of Common Stock (Tables)	9 Months Ended
	Sep. 30, 2014
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 September 30,
		2014									2013
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(48,121	)	$	(7,613	)	$	(1,324	)	$	(54	)	$	(12	)	$	(2	)
	Weighted-average common shares outstanding		745,558			117,946			20,517			639,360			144,252			20,517
	Basic net income (loss) per share	$	(0.06	)	$	(0.06	)	$	(0.06	)	$	0		$	0		$	0
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(48,121	)	$	(7,613	)	$	(1,324	)	$	(54	)	$	(12	)	$	(2	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(1,324	)		—			—			(2	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(7,613	)		—			—			(12	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(57,058	)	$	(7,613	)	$	(1,324	)	$	(68	)	$	(12	)	$	(2	)
	Weighted-average common shares outstanding-basic		745,558			117,946			20,517			639,360			144,252			20,517
	Conversion of Class C to Class A common shares		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares		117,946			—			—			144,252			—			—
	Weighted-average common shares outstanding-diluted		884,021			117,946			20,517			804,129			144,252			20,517
	Diluted net income (loss) per share	$	(0.06	)	$	(0.06	)	$	(0.06	)	$	0		$	0		$	0
		Nine Months Ended September 30,
		2014									2013
		Class			Class			Class			Class			Class			Class
		A			B			C			A			B			C
		(unaudited)
	BASIC:
	Net income (loss) attributable to common stockholders	$	(151,292	)	$	(25,215	)	$	(4,267	)	$	(9,102	)	$	(2,333	)	$	(305	)
	Weighted-average common shares outstanding		727,425			121,236			20,517			613,323			157,192			20,517
	Basic net income per share	$	(0.21	)	$	(0.21	)	$	(0.21	)	$	(0.01	)	$	(0.01	)	$	(0.01	)
	DILUTED:
	Net income (loss) attributable to common stockholders	$	(151,292	)	$	(25,215	)	$	(4,267	)	$	(9,102	)	$	(2,333	)	$	(305	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class A shares		(4,267	)		—			—			(305	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(25,215	)		—			—			(2,333	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(180,774	)	$	(25,215	)	$	(4,267	)	$	(11,740	)	$	(2,333	)	$	(305	)
	Weighted-average common shares outstanding-basic		727,425			121,236			20,517			613,323			157,192			20,517
	Conversion of Class C to Class A common shares outstanding		20,517			—			—			20,517			—			—
	Conversion of Class B to Class A common shares outstanding		121,236			—			—			157,192			—			—
	Number of shares used in diluted net income (loss) per share		869,178			121,236			20,517			791,032			157,192			20,517
	Diluted net income (loss) per share	$	(0.21	)	$	(0.21	)	$	(0.21	)	$	(0.01	)	$	(0.01	)	$	(0.01	)
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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Stock options		42,726			60,320			43,206			65,803
	Warrants		—			695			—			695
	Restricted shares		13,763			3,649			12,333			4,439
	ZSUs		51,550			63,448			56,484			61,326
	Total		108,039			128,112			112,023			132,263

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Lease Payments for Operating Leases	'
	As of September 30, 2014, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2014	$	5,449
	2015		27,950
	2016		22,607
	2017		13,026
	2018		11,788
	2019 and thereafter		33,964
		$	114,784

Geographical_Information_Table

Geographical Information (Tables)	9 Months Ended
	Sep. 30, 2014
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				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
	United States		$	110,308	$	122,648	$	301,168	$	416,984
	All other countries (1)			66,303		79,932		196,695		279,920
	Total revenue		$	176,611	$	202,580	$	497,863	$	696,904
		(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
			September 30,		December 31,
			2014		2013
	United States		$	303,773	$	345,598
	All other countries			3,614		3,195
	Total property and equipment, net		$	307,387	$	348,793

Overview_and_Summary_of_Signif2

Overview and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'
Initial offering period	'	'December 2011
Decrease in revenue and income from continuing operations	'	$0.80
Impact on reported earnings per share	'	$0
Reduction of non-current liabilities	$33.30	'

Marketable_Securities_Summary_

Marketable Securities - Summary of Available-for-Sale Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$1,016,795	$1,076,233
Gross Unrealized Gains	274	522
Gross Unrealized Losses	-470	-308
Aggregate Fair Value	1,016,599	1,076,447
Municipal securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,908	11,376
Gross Unrealized Gains	'	6
Gross Unrealized Losses	'	'
Aggregate Fair Value	11,908	11,382
U.S. government and government agency debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	429,462	333,632
Gross Unrealized Gains	162	160
Gross Unrealized Losses	-115	-51
Aggregate Fair Value	429,509	333,741
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	575,425	731,225
Gross Unrealized Gains	112	356
Gross Unrealized Losses	-355	-257
Aggregate Fair Value	$575,182	$731,324

Marketable_Securities_Fair_Val

Marketable Securities - Fair Value of Available-for-Sale Marketable Securities by Contractual Maturities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Marketable Securities [Abstract]	'	'
Due within one year	$697,484	'
After one year through three years	319,115	'
Aggregate Fair Value	$1,016,599	$1,076,447

Marketable_Securities_Addition

Marketable Securities - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Marketable Securities [Abstract]	'	'
Unrealized losses	$0.50	$0.30
Fair value	539	240.9
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 $)	9 Months Ended	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
		Maximum [Member]	Research and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Maximum amount to be earned and payable	$100	'	'
Maximum amount achievable and payable	'	60	'
Change in fair value of contingent consideration liability	'	'	$6.80

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value Assets Measured on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	$1,058,556	$1,425,868
Contingent consideration [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Liabilities Fair Value Disclosure Recurring	31,820	11,720
Municipal securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	11,908	11,382
Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	41,957	349,421
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	429,509	333,741
Corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	575,182	731,324
Fair value, inputs, Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	41,957	349,421
Fair value, inputs, Level 1 [Member] | Contingent consideration [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Liabilities Fair Value Disclosure Recurring	'	'
Fair value, inputs, Level 1 [Member] | Municipal securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
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	41,957	349,421
Fair value, inputs, Level 1 [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	'	'
Fair value, inputs, Level 1 [Member] | Corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
Fair value, inputs, Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	1,016,599	1,076,447
Fair value, inputs, Level 2 [Member] | Contingent consideration [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Liabilities Fair Value Disclosure Recurring	'	'
Fair value, inputs, Level 2 [Member] | Municipal securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	11,908	11,382
Fair value, inputs, Level 2 [Member] | Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
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	429,509	333,741
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	575,182	731,324
Fair value, inputs, Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
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	31,820	11,720
Fair value, inputs, Level 3 [Member] | Municipal securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
Fair value, inputs, Level 3 [Member] | Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'
Fair value, inputs, Level 3 [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	'	'
Fair value, inputs, Level 3 [Member] | Corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	'	'

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$477,088	$557,371
Less accumulated depreciation	-169,701	-208,578
Total property and equipment, net	307,387	348,793
Computer equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	141,464	225,063
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	194,351	192,512
Furniture and fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	10,775	11,303
Leasehold improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	9,706	11,695
Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$31,662	$27,668

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended			9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Feb. 11, 2014	Feb. 11, 2014	Feb. 11, 2014
			Common Class A [Member]	NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]
						Common Class A [Member]	Common Class A [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Business acquisition effective date of acquisition	'	'	'	11-Feb-14	'	'	'
Business acquisition percentage of voting interests acquired	'	'	'	'	100.00%	'	'
Business acquisition, cost of acquired entity, cash paid	'	'	'	$522,158,000	$522,200,000	'	'
Common stock, shares	28,200,000	'	'	28,178,201	'	'	'
Class A Common Stock closing price	'	'	$4.63	'	'	'	'
Preliminary fair value of stock options	'	'	'	'	'	'	29,700,000
Purchase consideration	'	'	'	'	'	700,000	'
Allocation for future compensation expense	'	'	'	'	'	29,000,000	'
Common stock granted to continuing employees	'	'	'	'	'	11,600,000	'
Common stock vesting period	'	'	'	'	'	'3 years	'
Common stock value as on acquisition date	'	'	'	'	'	53,600,000	'
Professional fees and transaction taxes	'	'	'	6,400,000	'	'	'
Stock-based expense	93,468,000	65,066,000	'	20,300,000	'	'	'
Amortization of acquired intangibles, net of tax	'	'	'	$14,000,000	'	'	'

Acquisitions_Fair_Value_of_Pur

Acquisitions - Fair Value of Purchase Consideration (Detail) (NaturalMotion, Ltd. [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Feb. 11, 2014
NaturalMotion, Ltd. [Member]	'	'
Business Acquisition [Line Items]	'	'
Cash	$391,000	'
Common stock	130,465	'
Fair value of stock options assumed	693	'
Total	$522,158	$522,200

Acquisitions_Fair_Value_of_Pur1

Acquisitions - Fair Value of Purchase Consideration (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2014
Business Acquisition [Line Items]	'
Common stock, shares	28,200,000
NaturalMotion, Ltd. [Member]	'
Business Acquisition [Line Items]	'
Common stock, shares	28,178,201

Acquisitions_Schedule_of_Purch

Acquisitions - Schedule of Purchase Price Allocation (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Feb. 11, 2014	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified			NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]	NaturalMotion, Ltd. [Member]
					Developed technology [Member]	Branding and trade names [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'
Preliminary Estimated Fair Value, Tangible assets net of (liabilities) assumed	'	'	($2,648)	'	'	'
Preliminary Estimated Fair Value, Intangible assets	'	'	'	'	59,900	15,000
Preliminary Estimated Fair Value, Goodwill	675,324	227,989	449,906	'	'	'
Preliminary Estimated Fair Value, Total	'	'	$522,158	$522,200	'	'
Preliminary Estimated Weighted Average Useful Life	'	'	'	'	'3 years	'4 years 7 months 6 days

Acquisitions_Schedule_of_Reven

Acquisitions - Schedule of Revenues and Earnings of Acquired Entity Post Acquisition Period (Detail) (NaturalMotion, Ltd. [Member], USD $)	8 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
NaturalMotion, Ltd. [Member]	'
Business Combination, Separately Recognized Transactions [Line Items]	'
Total revenues	$14,721
Net loss	$56,434

Acquisitions_Pro_Forma_Financi

Acquisitions - Pro Forma Financial Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition, Pro Forma Information [Abstract]	'	'
Total revenues	$504,982	$721,240
Net loss	($188,811)	($56,104)

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Schedule of Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Goodwill [Roll Forward]	'
Goodwill, beginning balance	$227,989
Additions	450,130
Foreign currency translation adjustments	-2,795
Goodwill, ending balance	$675,324

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Acquisition-Related Intangible Assets (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Value	$176,615
Accumulated Amortization	-100,136
Net Book Value	76,479
Developed technology [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Value	154,615
Accumulated Amortization	-88,906
Net Book Value	65,709
Trademarks, branding and domain names [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Value	16,292
Accumulated Amortization	-7,325
Net Book Value	8,967
Acquired lease intangibles [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Value	5,708
Accumulated Amortization	-3,905
Net Book Value	$1,803

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Schedule of Finite Lived Intangible Assets Future Amortization Expense (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]	'
2014	$7,290
2015	28,032
2016	25,681
2017 and thereafter	9,356
Total	$70,359

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
					Federal research and development tax credit [Member]	Foreign [Member]
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]	'	'	'	'	'	'
Decrease in income tax expense benefit	$100,000	'	$17,800,000	'	'	'
Incremental benefit	'	'	'	'	5,000,000	'
Changes in estimated jurisdictional mix of earnings	'	12,800,000	12,800,000	'	'	'
Provision for (benefit from) income taxes	($783,000)	($891,000)	($9,874,000)	($27,646,000)	'	$0

Other_Current_Liabilities_Sche

Other Current Liabilities - Schedule of Other Current Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]	'	'
Accrued escrow for acquisitions	$47,913	$6,122
Contingent consideration liability	31,820	'
Accrued compensation liability	21,444	10,185
Accrued restructuring liability	11,140	6,751
Other current liabilities	41,639	45,808
Total other current liabilities	$153,956	$68,866

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	$27,700,000	'	'	'
Restructuring liability	7,011,000	8,128,000	9,813,000	13,561,000
Restructuring liability, expected paid out period	'3 years	'	'	'
Cost of revenue [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	1,200,000	'	'	'
Research and development [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	9,600,000	'	'	'
Sales and marketing [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	1,500,000	'	'	'
General and administrative [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	15,400,000	'	'	'
2014 Restructuring Plan [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Total restructuring charge	27,700,000	'	'	'
Employee severance costs pay and related costs	13,400,000	'	'	'
Reversal of accumulated deferred rent liability	14,300,000	'	'	'
Stock-based expense reversals	2,400,000	'	'	'
Restructuring liability	$12,795,000	$14,006,000	$21,036,000	'
Restructuring liability, expected paid out period	'2 years 3 months 18 days	'	'	'

Restructuring_Summary_of_Histo

Restructuring - Summary of Historical Restructuring Liability (Detail) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring liability, Beginning balance	$8,128	$9,813	$13,561	$13,561
Restructuring expense and adjustments	-21	44	-239	-216
Cash payments	-1,096	-1,729	-3,509	-6,334
Restructuring liability, Ending balance	7,011	8,128	9,813	7,011
2014 Restructuring Plan [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring liability, Beginning balance	14,006	21,036	'	'
Restructuring expense and adjustments	308	-2,314	29,894	27,888
Cash payments	-1,519	-4,716	-8,858	-15,093
Restructuring liability, Ending balance	$12,795	$14,006	$21,036	$12,795

Restructuring_Summary_of_Histo1

Restructuring - Summary of Historical Restructuring Liability (Parenthetical) (Detail) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring expense and adjustments	($21)	$44	($239)	($216)
2014 Restructuring Plan [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring expense and adjustments	$308	($2,314)	$29,894	$27,888

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based expense	$36,295	$9,256	$93,468	$65,066
Cost of revenue [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based expense	1,110	-645	3,391	-351
Research and development [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based expense	24,281	10,119	60,293	46,907
Sales and marketing [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based expense	1,187	2,941	4,505	8,327
General and administrative [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based expense	$9,717	($3,159)	$25,279	$10,183

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Share Based Compensation Stock Option Activity (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'
Stock Options Outstanding, Beginning balance	41,081	'
Stock Options, Granted	13,163	'
Stock Options, Forfeited and cancelled	-4,374	'
Stock Options, Exercised	-8,491	'
Stock Options Outstanding, Ending balance	41,379	41,081
Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$2.07	'
Weighted Average Exercise Price, Granted	$2.41	'
Weighted Average Exercise Price, Forfeited and cancelled	$3.16	'
Weighted Average Exercise Price, Exercised	$1.16	'
Outstanding Options, Weighted Average Exercise Price, Ending Balance	$2.25	$2.07
Outstanding Options, Aggregate Value of Stock Options Outstanding	$49,299	$83,089
Weighted Average Contractual Term (in years)	'7 years 22 days	'7 years 7 days

Stockholders_Equity_Schedule_o1

Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'
Nonvested Outstanding Shares, Beginning balance	66,997
Nonvested Shares, Granted	33,731
Nonvested Shares, Vested	-19,411
Nonvested Shares, Forfeited and cancelled	-22,654
Nonvested Outstanding Shares, Ending balance	58,663
Weighted Average Grant Date Fair Value, Beginning balance	$4.96
Weighted Average Grant Date Fair Value, Granted	$3.87
Weighted Average Grant Date Fair Value, Vested	$5.27
Weighted Average Grant Date Fair Value, Forfeited and cancelled	$4.66
Weighted Average Grant Date Fair Value, Ending balance	$4.34
Nonvested Aggregated intrinsic value, Beginning balance	$254,589
Nonvested Aggregated intrinsic value, Ending balance	$158,390

Stockholders_Equity_Schedule_o2

Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), net of tax, Beginning balance	$17,130	'	($1,046)	'
Other comprehensive income (loss) before reclassifications net of tax	-21,651	'	-3,458	'
Reclassification from accumulated other comprehensive income current period net of tax	11	'	-6	'
Other comprehensive income (loss)	-21,640	1,366	-3,464	902
Accumulated other comprehensive income (loss), net of tax, Ending balance	-4,510	'	-4,510	'
Foreign Currency Translation [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), net of tax, Beginning balance	17,054	'	-1,259	'
Other comprehensive income (loss) before reclassifications net of tax	-21,368	'	-3,055	'
Other comprehensive income (loss)	-21,368	'	-3,055	'
Accumulated other comprehensive income (loss), net of tax, Ending balance	-4,314	'	-4,314	'
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), net of tax, Beginning balance	76	'	213	'
Other comprehensive income (loss) before reclassifications net of tax	-283	'	-403	'
Reclassification from accumulated other comprehensive income current period net of tax	11	'	-6	'
Other comprehensive income (loss)	-272	'	-409	'
Accumulated other comprehensive income (loss), net of tax, Ending balance	($196)	'	($196)	'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Oct. 31, 2012
Equity [Abstract]	'	'	'
Stock repurchase program authorized amount	'	'	$200
Stock repurchase program remaining authorized repurchase amount	$178.90	$178.90	'
Stock repurchase program number of shares repurchased	0	'	'
Stock repurchase program expiry date	'	31-Oct-14	'

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		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
BASIC:	'	'	'	'
Net income (loss) attributable to common stockholders	($57,058)	($68)	($180,774)	($11,740)
Weighted-average common shares outstanding	884,021	804,129	869,178	791,032
Basic net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
DILUTED:	'	'	'	'
Weighted-average common shares outstanding-basic	884,021	804,129	869,178	791,032
Weighted-average common shares outstanding-diluted	884,021	804,129	869,178	791,032
Diluted net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
Common Class A [Member]	'	'	'	'
BASIC:	'	'	'	'
Net income (loss) attributable to common stockholders	-48,121	-54	-151,292	-9,102
Weighted-average common shares outstanding	745,558	639,360	727,425	613,323
Basic net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
DILUTED:	'	'	'	'
Net income (loss) attributable to common stockholders	-48,121	-54	-151,292	-9,102
Net income (loss) attributable to common stockholders-diluted	-57,058	-68	-180,774	-11,740
Weighted-average common shares outstanding-basic	745,558	639,360	727,425	613,323
Weighted-average common shares outstanding-diluted	884,021	804,129	869,178	791,032
Diluted net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
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	-1,324	-2	-4,267	-305
Conversion of common stock class	20,517	20,517	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	-7,613	-12	-25,215	-2,333
Conversion of common stock class	117,946	144,252	121,236	157,192
Common Class B [Member]	'	'	'	'
BASIC:	'	'	'	'
Net income (loss) attributable to common stockholders	-7,613	-12	-25,215	-2,333
Weighted-average common shares outstanding	117,946	144,252	121,236	157,192
Basic net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
DILUTED:	'	'	'	'
Net income (loss) attributable to common stockholders	-7,613	-12	-25,215	-2,333
Net income (loss) attributable to common stockholders-diluted	-7,613	-12	-25,215	-2,333
Weighted-average common shares outstanding-basic	117,946	144,252	121,236	157,192
Weighted-average common shares outstanding-diluted	117,946	144,252	121,236	157,192
Diluted net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
Common Class B [Member] | Class C Convert To Class A [Member]	'	'	'	'
DILUTED:	'	'	'	'
Reallocation of net income (loss) as a result of common stock class conversion	'	'	'	'
Conversion of common stock class	'	'	'	'
Common Class B [Member] | Class B convert to Class A [Member]	'	'	'	'
DILUTED:	'	'	'	'
Reallocation of net income (loss) as a result of common stock class conversion	'	'	'	'
Conversion of common stock class	'	'	'	'
Common Class C [Member]	'	'	'	'
BASIC:	'	'	'	'
Net income (loss) attributable to common stockholders	-1,324	-2	-4,267	-305
Weighted-average common shares outstanding	20,517	20,517	20,517	20,517
Basic net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
DILUTED:	'	'	'	'
Net income (loss) attributable to common stockholders	-1,324	-2	-4,267	-305
Net income (loss) attributable to common stockholders-diluted	-1,324	-2	-4,267	-305
Weighted-average common shares outstanding-basic	20,517	20,517	20,517	20,517
Weighted-average common shares outstanding-diluted	20,517	20,517	20,517	20,517
Diluted net income (loss) per share	($0.06)	$0	($0.21)	($0.01)
Common Class C [Member] | Class C Convert To Class A [Member]	'	'	'	'
DILUTED:	'	'	'	'
Reallocation of net income (loss) as a result of common stock class conversion	'	'	'	'
Conversion of common stock class	'	'	'	'
Common Class C [Member] | Class B convert to Class A [Member]	'	'	'	'
DILUTED:	'	'	'	'
Reallocation of net income (loss) as a result of common stock class conversion	'	'	'	'
Conversion of common stock class	'	'	'	'

Net_Income_Loss_Per_Share_of_C3

Net Income (Loss) Per Share of Common Stock - Weighted Average Employee Equity Awards (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	108,039	128,112	112,023	132,263
Warrants [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	'	695	'	695
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	13,763	3,649	12,333	4,439
ZSUs [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	51,550	63,448	56,484	61,326
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	42,726	60,320	43,206	65,803

Commitments_and_Contingencies_1

Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
2014	$5,449
2015	27,950
2016	22,607
2017	13,026
2018	11,788
2019 and thereafter	33,964
Total operating leases, future minimum payments	$114,784

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail)

1 Months Ended

9 Months Ended

0 Months Ended

26 Months Ended

0 Months Ended

1 Months Ended

9 Months Ended

Jun. 30, 2013

Sep. 30, 2014

Apr. 02, 2014

Nov. 19, 2012

Mar. 11, 2012

Oct. 16, 2014

Aug. 01, 2012

Jul. 30, 2012

Apr. 04, 2013

Sep. 30, 2014

Aug. 03, 2012

Aug. 16, 2012

Jun. 30, 2013

Sep. 30, 2014

USD ($)

Delaware [Member]

Delaware [Member]

Delaware [Member]

Subsequent Event [Member]

Reyes v. Zynga Inc. [Member]

Case one [Member]

Lee v. Pincus [Member]

Stockholder Derivative Lawsuits [Member]

Zynga Shareholder Derivative Litigation [Member]

Zynga Inc. Derivative Litigation [Member]

Amended Credit Facility [Member]

Amended Credit Facility [Member]

Cases

Cases

Cases

Spear & Sons Limited [Member]

San Francisco [Member]

Northern California [Member]

Delaware [Member]

Cases

San Francisco [Member]

Northern California [Member]

USD ($)

EUR (€)

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

'

'

'

'

'

'

'

'

'

'

'

$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

600,000

'

'

'

'

'

'

'

'

'

'

'

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.

Claims filed

'

'

1

'

1

'

1

1

1

9

3

4

'

'

Claims settled

'

'

'

1

'

'

'

'

'

'

'

'

'

'

Demand for damages

'

'

'

'

'

650,000

'

'

'

'

'

'

'

'

Reimbursement of attorneys' fees

'

'

'

'

'

€ 250,000

'

'

'

'

'

'

'

'

Geographical_Information_Reven

Geographical Information - Revenue by Geographical Area (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	$176,611	$202,580	$497,863	$696,904
United States [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	110,308	122,648	301,168	416,984
All other countries [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	$66,303	$79,932	$196,695	$279,920

Geographical_Information_Reven1

Geographical Information - Revenue by Geographical Area (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Percentage of total revenue	10.00%

Geographical_Information_Prope

Geographical Information - Property and Equipment, Net (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Property plant and equipment, net	$307,387	$348,793
United States [Member]	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Property plant and equipment, net	303,773	345,598
All other countries [Member]	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Property plant and equipment, net	$3,614	$3,195