Zynga (ZNGA) 10-K 21 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013	Feb. 14, 2014	Feb. 14, 2014	Feb. 14, 2014
			Common Class A [Member]	Common Class B [Member]	Common Class C [Member]
Document Information [Line Items]	'	'	'	'	'
Document Type	'10-K	'	'	'	'
Amendment Flag	'false	'	'	'	'
Document Period End Date	31-Dec-13	'	'	'	'
Document Fiscal Year Focus	'2013	'	'	'	'
Document Fiscal Period Focus	'FY	'	'	'	'
Trading Symbol	'ZNGA	'	'	'	'
Entity Registrant Name	'ZYNGA INC	'	'	'	'
Entity Central Index Key	'0001439404	'	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'	'	'
Entity Current Reporting Status	'Yes	'	'	'	'
Entity Voluntary Filers	'No	'	'	'	'
Entity Filer Category	'Large Accelerated Filer	'	'	'	'
Entity Common Stock, Shares Outstanding	'	'	730,851,627	125,516,497	20,517,472
Entity Public Float	'	$1,903	'	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$465,523	$385,949
Marketable securities	659,973	898,821
Accounts receivable, net of allowance of $0 and $160 at December 31, 2013 and December 31, 2012, respectively	65,667	106,327
Income tax receivable	6,943	5,607
Deferred tax assets	16,293	30,122
Restricted cash	3,493	28,152
Other current assets	23,507	29,392
Total current assets	1,241,399	1,484,370
Long-term marketable securities	416,474	367,543
Goodwill	227,989	208,955
Other intangible assets, net	18,282	33,663
Property and equipment, net	348,793	466,074
Other long-term assets	26,148	15,715
Total assets	2,279,085	2,576,320
Current liabilities:	'	'
Accounts payable	20,973	23,298
Other current liabilities	68,866	146,883
Deferred revenue	186,663	338,964
Total current liabilities	276,502	509,145
Long-term debt	'	100,000
Deferred revenue	3,252	8,041
Deferred tax liabilities	'	24,584
Other non-current liabilities	122,060	109,047
Total liabilities	401,814	750,817
Stockholders' equity:	'	'
Common stock, $.00000625 par value, and additional paid in capital-authorized shares: 2,020,517; shares outstanding: 832,309 shares (Class A, 685,554, Class B, 126,238, Class C, 20,517) as of December 31, 2013 and 779,250 (Class A, 589,100, Class B, 169,632, Class C, 20,517) as of December 31, 2012	2,823,743	2,725,605
Treasury stock	'	-295,113
Accumulated other comprehensive income (loss)	-1,046	-1,447
Accumulated deficit	-945,426	-603,542
Total stockholders' equity	1,877,271	1,825,503
Total liabilities and stockholders' equity	$2,279,085	$2,576,320

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowance	$0	$160
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	2,020,517	2,020,517
Common stock, shares outstanding	832,309	779,250
Common Class A [Member]	'	'
Common stock, shares outstanding	685,554	589,100
Common Class B [Member]	'	'
Common stock, shares outstanding	126,238	169,632
Common Class C [Member]	'	'
Common stock, shares outstanding	20,517	20,517

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:	'	'	'
Online game	$759,572	$1,144,252	$1,065,648
Advertising	113,694	137,015	74,452
Total revenue	873,266	1,281,267	1,140,100
Costs and expenses:	'	'	'
Cost of revenue	248,358	352,169	330,043
Research and development	413,001	645,648	727,018
Sales and marketing	104,403	181,924	234,199
General and administrative	162,918	189,004	254,456
Impairment of intangible assets	10,217	95,493	'
Total costs and expenses	938,897	1,464,238	1,545,716
Income (loss) from operations	-65,631	-182,971	-405,616
Interest income	4,148	4,749	1,680
Other income (expense), net	-3,386	18,647	-2,206
Income (loss) before income taxes	-64,869	-159,575	-406,142
Provision for (benefit from) income taxes	-27,887	49,873	-1,826
Net income (loss)	($36,982)	($209,448)	($404,316)
Net income (loss) per share attributable to common stockholders	'	'	'
Basic	($0.05)	($0.28)	($1.40)
Diluted	($0.05)	($0.28)	($1.40)
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:	'	'	'
Basic	799,794	741,177	288,599
Diluted	799,794	741,177	288,599

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Partners Capital [Abstract]	'	'	'
Net income (loss)	($36,982)	($209,448)	($404,316)
Other comprehensive income (loss):	'	'	'
Change in foreign currency translation adjustment	-1,586	-126	456
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	-436	740	-208
Net change on unrealized gains (losses) on derivative instruments	2,423	-2,423	'
Other comprehensive income (loss):	401	-1,809	248
Comprehensive income (loss):	($36,581)	($211,257)	($404,068)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)

Total

Series C Convertible Preferred Stock [Member]

Series Z Convertible Preferred Stock [Member]

Common Class A [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Common Stock [Member]

Common Stock [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Treasury Stock [Member]

OCI [Member]

Retained Earnings (Accumulated Deficit) [Member]

In Thousands, except Share data

Series C Convertible Preferred Stock [Member]

Series Z Convertible Preferred Stock [Member]

Common Class A [Member]

Common Class A [Member]

Beginning balance, Value at Dec. 31, 2010

$482,215

'

'

'

$394,026

'

'

$2

'

$79,335

'

($1,484)

$114

$10,222

Beginning balance, Shares at Dec. 31, 2010

'

'

'

'

276,702,000

'

'

291,524,000

'

'

'

'

'

'

Exercise of stock options

2,893

'

'

'

'

'

'

'

'

2,893

'

'

'

'

Exercise of stock options, Shares

'

'

'

'

'

'

'

27,889,000

'

'

'

'

'

'

Issuance of stock, net of issuance costs

'

-485,300

'

961,402

'

-485,300

'

'

1

'

961,401

'

'

'

Issuance of stock, net of issuance costs, Shares

'

'

'

'

'

34,927,000

'

'

100,000,000

'

'

'

'

'

Repurchase of preferred and common stock

-283,770

'

'

'

'

'

'

'

'

-2,500

'

-281,270

'

'

Repurchase of preferred and common stock, Shares

'

'

'

'

-8,764,000

'

'

-18,716,000

'

'

'

'

'

'

Conversion of convertible preferred stock to common stock

'

'

'

'

-925,661

'

'

1

'

925,660

'

'

'

'

Conversion of convertible preferred stock to common stock, Shares

'

'

'

'

-304,860,000

'

'

304,860,000

'

'

'

'

'

'

Vesting of ZSUs, net

-83,233

'

'

'

'

'

'

'

'

-83,090

'

-143

'

'

Vesting of ZSUs, net, Shares

'

'

'

'

'

'

'

16,035,000

'

'

'

'

'

'

Vesting of common stock following the early exercise of options

233

'

'

'

'

'

'

'

'

233

'

'

'

'

Issuance of stock in connection with business acquisitions

'

'

2,105

'

'

'

2,105

'

'

'

'

'

'

'

Issuance of stock in connection with business acquisitions, Shares

'

'

'

'

'

'

1,995,000

'

'

'

'

'

'

'

Stock-based expense

600,212

'

'

'

44,230

'

'

'

'

555,982

'

'

'

'

Tax (cost) benefit from stock-based expense

-13,750

'

'

'

'

'

'

'

'

-13,750

'

'

'

'

Net loss

-404,316

'

'

-8,522

'

'

'

'

'

'

'

'

'

-404,316

Other comprehensive income (loss)

248

'

'

'

'

'

'

'

'

'

'

'

248

'

Ending balance, Value at Dec. 31, 2011

1,749,539

'

'

'

'

'

'

4

'

2,426,164

'

-282,897

362

-394,094

Ending balance, Shares at Dec. 31, 2011

'

'

'

'

'

'

'

721,592,000

'

'

'

'

'

'

Exercise of stock options

21,447

'

'

'

'

'

'

1

'

21,446

'

'

'

'

Exercise of stock options, Shares

'

'

'

'

'

'

'

42,285,000

'

'

'

'

'

'

Repurchase of preferred and common stock

-11,756

'

'

'

'

'

'

'

'

'

'

-11,756

'

'

Repurchase of preferred and common stock, Shares

'

'

'

'

'

'

'

-4,962,000

'

'

'

'

'

'

Vesting of ZSUs, net

-26,267

'

'

'

'

'

'

'

'

-25,807

'

-460

'

'

Vesting of ZSUs, net, Shares

'

'

'

'

'

'

'

25,649,000

'

'

'

'

'

'

Vesting of common stock following the early exercise of options

614

'

'

'

'

'

'

'

'

614

'

'

'

'

Issuance of stock in connection with business acquisitions

194

'

'

'

'

'

'

'

'

194

'

'

'

'

Issuance of stock in connection with business acquisitions, Shares

'

'

'

'

'

'

'

3,208,000

'

'

'

'

'

'

Cancellation of unvested restricted common stock, Shares

'

'

'

'

'

'

'

-9,814,000

'

'

'

'

'

'

Stock-based expense

281,986

'

'

'

'

'

'

'

'

281,986

'

'

'

'

Stock-based expense, Shares

'

'

'

'

'

'

'

1,291

'

'

'

'

'

'

Tax (cost) benefit from stock-based expense

21,003

'

'

'

'

'

'

'

'

21,003

'

'

'

'

Net loss

-209,448

'

'

-109,643

'

'

'

'

'

'

'

'

'

-209,448

Other comprehensive income (loss)

-1,809

'

'

'

'

'

'

'

'

'

'

'

-1,809

'

Ending balance, Value at Dec. 31, 2012

1,825,503

'

'

'

'

'

'

5

'

2,725,600

'

-295,113

-1,447

-603,542

Ending balance, Shares at Dec. 31, 2012

'

'

'

'

'

'

'

779,249,000

'

'

'

'

'

'

Exercise of stock options

26,115

'

'

'

'

'

'

'

'

26,115

'

'

'

'

Exercise of stock options, Shares

30,333,000

'

'

'

'

'

'

34,020,000

'

'

'

'

'

'

Vesting of ZSUs, net

-1,387

'

'

'

'

'

'

'

'

-901

'

-486

'

'

Vesting of ZSUs, net, Shares

'

'

'

'

'

'

'

22,914,000

'

'

'

'

'

'

Vesting of common stock following the early exercise of options

363

'

'

'

'

'

'

'

'

363

'

'

'

'

Cancellation of unvested restricted common stock, Shares

'

'

'

'

'

'

'

-502,000

'

'

'

'

'

'

Stock-based expense

84,393

'

'

'

'

'

'

'

'

84,393

'

'

'

'

Retirement of treasury stock, net of repurchases

-9,303

'

'

'

'

'

'

'

'

'

'

295,599

'

-304,902

Retirement of treasury stock, Shares

'

'

'

'

'

'

'

-3,372,000

'

'

'

'

'

'

Tax (cost) benefit from stock-based expense

-11,832

'

'

'

'

'

'

'

'

-11,832

'

'

'

'

Net loss

-36,982

'

'

-29,082

'

'

'

'

'

'

'

'

'

-36,982

Other comprehensive income (loss)

401

'

'

'

'

'

'

'

'

'

'

'

401

'

Ending balance, Value at Dec. 31, 2013

$1,877,271

'

'

'

'

'

'

$5

'

$2,823,738

'

'

($1,046)

($945,426)

Ending balance, Shares at Dec. 31, 2013

'

'

'

'

'

'

'

832,309,000

'

'

'

'

'

'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income (loss)	($36,982)	($209,448)	($404,316)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization	129,047	141,479	95,414
Stock-based expense	84,393	281,986	600,212
(Gain) loss from sales of investments, assets and other, net	8,147	563	'
Net gain on termination of lease and purchase of building	'	-19,886	-550
Tax benefits (costs) from stock-based awards	-11,244	21,652	'
Excess tax benefits (costs) from stock-based awards	11,244	-21,652	13,750
Accretion and amortization on marketable securities	17,575	17,223	2,873
Deferred income taxes	-18,766	-43,841	4,367
Impairment of intangible assets	10,217	95,493	'
Changes in operating assets and liabilities:	'	'	'
Accounts receivable, net	40,806	34,338	-55,432
Income tax receivable	-1,336	12,976	17,994
Other assets	3,932	19,908	-14,559
Accounts payable	-2,325	-21,312	10,373
Deferred revenue	-157,090	-133,640	15,409
Other liabilities	-48,944	19,928	103,637
Net cash provided by (used in) operating activities	28,674	195,767	389,172
Investing activities:	'	'	'
Purchases of marketable securities	-1,074,919	-1,826,137	-649,972
Sales of marketable securities	353,603	223,828	19,206
Maturities of marketable securities	891,238	647,916	841,560
Purchase of corporate headquarters building	'	-233,700	'
Acquisition of property and equipment	-7,813	-98,054	-238,091
Business acquisition, net of cash acquired	-18,054	-205,510	-42,774
Proceeds from sale of property and equipment	3,057	'	'
Equity method investment	'	-10,000	'
Restricted cash	227	6,979	9,194
Other investing activities, net	137	-2,256	-2,578
Net cash provided by (used in) investing activities	147,476	-1,496,934	-63,455
Financing activities:	'	'	'
Net proceeds from initial public offering	'	'	961,403
Proceeds from debt, net of issuance costs	'	99,780	'
Taxes paid related to net share settlement of equity awards	-1,387	-26,307	-83,232
Repurchases of common stock	-9,302	-11,756	-283,770
Proceeds from exercise of stock options	18,223	16,960	2,893
Proceeds from employee stock purchase plan	7,892	4,489	'
Net proceeds from issuance of preferred stock	'	'	485,300
Excess tax benefits from stock-based awards	-11,244	21,652	-13,750
Repayment of debt	-100,000	'	'
Net cash provided by (used in) financing activities	-95,818	104,818	1,068,844
Effect of exchange rate changes on cash and cash equivalents	-758	-45	-49
Net increase (decrease) in cash and cash equivalents	79,574	-1,196,394	1,394,512
Cash and cash equivalents, beginning of period	385,949	1,582,343	187,831
Cash and cash equivalents, end of period	$465,523	$385,949	$1,582,343

Overview_and_Summary_of_Signif

Overview and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
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.
	Initial Public Offering
	On December 15, 2011, we completed our initial public offering in which we issued and sold 100 million shares of Class A common stock at a public offering price of $10.00 per share. We raised a total of $961.4 million of net proceeds after deducting underwriter discounts and commissions of $32.5 million and other offering expenses of $6.1 million. Upon the closing of the initial public offering, all shares of the Company’s then-outstanding convertible preferred stock automatically converted into an aggregate of 304.9 million shares of Class B common stock. Additionally, 15.7 million vested restricted stock units (“ZSUs”), after deducting shares withheld to satisfy minimum tax withholding obligations, were automatically converted into Class B common shares.
	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 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.
	Segments
	We have one operating segment with one business activity, developing and monetizing social games. Our Chief Operating Decision Maker (“CODM”), our Chief Executive Officer, manages our operations on a consolidated basis for purposes of allocating resources. When evaluating performance and allocating resources, the CODM reviews financial information presented on a consolidated basis, accompanied by disaggregated bookings information for our games.
	Revenue Recognition
	We derive revenue from the sale of virtual goods associated with our online games and the sale of advertising.
	Online Game
	We operate our games as live services that allow players to play for free. Within these games, players can purchase virtual currency to obtain virtual goods to enhance their game-playing experience. Players can pay for our virtual currency using Facebook Credits (prior to July 2013) or Facebook local currency payments (beginning July 2013) when playing our games through the Facebook platform, and can use other payment methods such as credit cards or PayPal on other platforms. We also sell game cards that are initially recorded as a customer deposit liability which is included in other current liabilities on the consolidated balance sheet, net of fees retained by retailers and distributors. Upon redemption of a game card in one of our games and delivery of the purchased virtual currency to the player, these amounts are reclassified to deferred revenue. Advance payments from customers that are non-refundable and relate to non-cancellable contracts that specify our obligations are recorded to deferred revenue. All other advance payments that do not meet these criteria are recorded as customer deposits.
	We recognize revenue when all of the following conditions are satisfied: (1) there is persuasive evidence of an arrangement; (2) the service has been provided to the player; (3) the collection of our fees is reasonably assured; and (4) the amount of fees to be paid by the player is fixed or determinable. For purposes of determining when the service has been provided to the player, we have determined that an implied obligation exists to the paying player to continue displaying the purchased virtual goods within the online game over their estimated life or until they are consumed. The proceeds from the sale of virtual goods are initially recorded in deferred revenue. We categorize our virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action. For the sale of consumable virtual goods, we recognize revenue as the goods are consumed, which approximates one month. Durable virtual goods represent virtual goods that are accessible to the player over an extended period of time. We recognize revenue from the sale of durable virtual goods ratably over the estimated average playing period of paying players for the applicable game, which represents our best estimate of the estimated average life of durable virtual goods. If we do not have the ability to differentiate revenue attributable to durable virtual goods from consumable virtual goods for a specific game we recognize revenue on the sale of durable and consumable virtual goods for that game ratably over the estimated average period that paying players typically play that game.
	Prior to October 1, 2009, we did not have the data to determine the consumption dates for our consumable virtual goods or to differentiate revenue attributable to durable virtual goods from consumable virtual goods. Beginning in October 2009, we had sufficient data to separately account for consumable and durable virtual goods in one of our games, thus allowing us to recognize revenue related to consumable goods upon consumption. Since January 2010, we have had this data for substantially all of our web games, thus allowing us to recognize revenue related to consumable goods upon consumption for our web-based games. However, for our stand-alone mobile games, we do not have the requisite data to separately account for consumable and durable virtual goods and have therefore recorded mobile revenue ratably over the estimated average payer life. We expect that in future periods there will be changes in the mix of durable and consumable virtual goods sold, reduced virtual good sales in some existing games, changes in estimates in average paying payer life and/or changes in our ability to make such estimates. When such changes occur, and in particular if more of our revenue in any period is derived from goods for which revenue is recognized over the estimated average playing period, or that period increases on average, the amount of revenue that we recognize in a future period may be reduced, perhaps significantly.
	Future usage patterns may differ from historical usage patterns and therefore the estimated average playing periods may change in the future. We assess the estimated average playing period for paying players and the estimated average life of our virtual goods quarterly. Changes in estimated average playing period for paying players in 2013 resulted in an increase in revenue of $12.3 million and will result in an offsetting reduction of 2014 revenue in the same amount.
	We estimate chargebacks from Facebook and third-party payment processors to account for potential future chargebacks based on historical data and record such amounts as a reduction of revenue.
	From July 2010 through the third quarter of 2013, Facebook’s proprietary virtual currency, Facebook Credits, was the primary in-game payment method for our games played on the Facebook platform. Under the terms of our agreement with Facebook, Facebook set the price our players pay for Facebook Credits and collected the funds from the sale of Facebook Credits. Facebook’s stated face value of a Facebook Credit was $0.10. For each Facebook Credit purchased by our players and redeemed in our games, Facebook remitted to us $0.07, which is the amount we recognized as revenue. Accordingly, we recognized revenue net of the amounts retained by Facebook related to Facebook Credits transactions because we did not set the pricing of Facebook Credits sold to the players of our games on Facebook. In July 2013, Facebook began to transition payments made on the Facebook platform from Facebook Credits to Facebook’s local currency-based payments program. This transition was completed in the fourth quarter of 2013. Under the terms of our agreement, Facebook remits to us 70% of the price we request to be charged to the game player for each transaction. We recognize revenue net of the amounts retained by Facebook related to Facebook local currency-based payments because Facebook may choose to alter our recommended price, for example by offering a discount or other incentives to players playing on their platform. Additionally we do not receive information from Facebook indicating the amount of such discounts offered to our paying players or regarding the actual cash paid by our players to Facebook. Accordingly, we are unable to determine the gross amount paid by our players to Facebook. Prior to the implementation of Facebook Credits in our games, players could purchase our virtual goods through various widely accepted payment methods offered in the games and we recognized revenue based on the transaction price paid by the player.
	For revenue earned through certain mobile platforms, including Apple iOS and Google Android, we recognize online game revenue based on the gross amount paid by the player because we are the primary obligor and we have the contractual right to determine the price to be paid by the player. We record the related platform and payment processing fees as cost of revenue in the period incurred.
	Advertising
	We have contractual relationships with agencies, advertising brokers and certain advertisers for advertisements within our games. We recognize advertising revenue for branded virtual goods and sponsorships, engagement advertisements and offers, mobile advertisements and other advertisements as advertisements are delivered to customers as long as evidence of the arrangement exists (executed contract), the price is fixed or determinable, and we have assessed collectability as reasonably assured. Certain branded in-game sponsorships that involve virtual goods are deferred and recognized over the estimated life of the branded virtual good or as consumed, similar to online game revenue. Price is determined to be fixed and determinable when there is a fixed price in the applicable evidence of the arrangement, which may include a master contract, insertion order, or a third party statement of activity. For branded virtual goods and sponsorships, we determine the delivery criteria has been met based on delivery information from our internal systems or from third parties. For engagement advertisements and offers, mobile advertisements, and other advertisements, delivery occurs when the advertisement has been displayed or the offer has been completed by the customer, as evidenced by third party verification reports supporting the number of advertisements displayed or offers completed.
	We report our advertising revenue net of amounts retained by advertising networks, agencies, and brokers because we are not the primary obligor in our arrangements, we do not set the pricing, and we do not establish or maintain the relationship with the advertiser.
	Multiple-element Arrangements
	We allocate arrangement consideration in multiple-deliverable revenue arrangements at the inception of an arrangement to all deliverables based on the relative selling price method, generally based on our best estimate of selling price. We offer certain promotions to customers from time to time that include the sale of in-game virtual currency via the sale of a game card and also other deliverables such as a limited edition in-game virtual good.
	Cost of Revenue
	Amounts recorded as cost of revenue relate to direct expenses incurred in order to generate online game revenue. Such costs are recorded as incurred. Our cost of revenue consists primarily of hosting and data center costs related to operating our games, including depreciation; consulting costs primarily related to third-party provisioning of customer support services; payment processing fees; and salaries, benefits and stock-based expense for our customer support and infrastructure teams. Cost of revenue also includes amortization expense related to purchased technology of $11.3 million, $38.5 million and $28.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Cash and Cash Equivalents
	Cash equivalents consist of cash on hand, money market funds, commercial paper, corporate bonds, municipal securities, and U.S. government-issued obligations with maturities of 90 days or less from the date of purchase.
	Marketable Securities and Non-Marketable Securities
	Marketable securities consist of U.S. government-issued obligations, municipal securities and corporate debt securities. Management determines the appropriate classification of marketable securities at the time of purchase and evaluates such determination at each balance sheet date. The fair value of marketable securities is determined as the exit price in the principal market in which we would transact. Based on our intentions regarding our marketable securities, all marketable securities are classified as available-for-sale and are carried at fair value with unrealized gains and losses recorded as a separate component of other comprehensive income, net of income taxes. Realized gains and losses are determined using the specific-identification method and are reflected as a component of other income (expense), net in the consolidated statements of operations when they are realized. When we determine that a decline in fair value is other than temporary, the cost basis of the individual security is written down to the fair value as a new cost basis and the amount of the write-down is accounted for as a realized loss in other income (expense), net. The new cost basis will not be adjusted for subsequent recoveries in fair value. Determination of whether declines in fair value are other than temporary requires judgment regarding the amount and timing of recovery. No such impairments of marketable securities have been recorded to date.
	For non-marketable securities in which we exercise significant influence on the equity to which these non-marketable securities relate, we apply the equity method of accounting. Our non-marketable securities are subject to periodic impairment reviews.
	Restricted Cash
	Restricted cash consists of collateral for facility operating lease agreements and funds held in escrow in accordance with the terms of certain of our business acquisition agreements.
	Derivatives and Hedging
	We account for derivative financial instruments in accordance with Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging, which requires that every derivative instrument be recorded on the balance sheet as either an asset or liability measured at its fair value as of the reporting date. ASC 815 also requires that changes in our derivatives’ fair values be recognized in earnings, unless specific hedge accounting and contemporaneous documentation criteria are met, in which case, the change in fair value related to the effective portion of the hedge may be recognized as a component of accumulated other comprehensive income (i.e., the instruments qualify for hedge accounting treatment). Any ineffective or excluded portion of a designated cash flow hedge is recognized in earnings.
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are recorded and carried at the original invoiced amount less an allowance for any potential uncollectible amounts. We review accounts receivable regularly and make estimates for the allowance for doubtful accounts when there is doubt as to our ability to collect individual balances. In evaluating our ability to collect outstanding receivable balances, we consider many factors, including the age of the balance, the customer’s payment history and current creditworthiness, and current economic trends. Bad debts are written off after all collection efforts have ceased. We do not require collateral from our customers.
	Property and Equipment
	Property and equipment are stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the estimated useful lives of the improvements or the lease term.
	Business Combinations
	We account for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations. We allocate the purchase price of the acquisition, which includes the estimated acquisition date fair value of contingent consideration to the tangible assets, liabilities, and identifiable intangible assets acquired based on their estimated fair values. The excess of the purchase price over those fair values is recorded as goodwill. Acquisition-related expenses and restructuring costs are expensed as incurred. During the measurement period, we record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, which could be up to one year after the transaction date, subsequent adjustments are recorded to our consolidated statements of operations. We record changes in the fair value of contingent consideration liabilities within operating expenses in our consolidated statement of operations each reporting period.
	Goodwill and Indefinite-Lived Intangible Assets
	Goodwill and indefinite-lived intangible assets are carried at cost and are evaluated annually for impairment, or more frequently if circumstances exist that indicate that impairment may exist. When conducting our annual goodwill impairment assessment, we perform a quantitative evaluation of whether goodwill is impaired using the two-step impairment test. The first step is comparing the fair value of our reporting unit to its carrying value. We consider the enterprise to be the reporting unit for this analysis. If step one indicates that impairment potentially exists, the second step is performed to measure the amount of impairment, if any. We record the amount by which the carrying value of the goodwill exceeds its implied fair value, if any, as impairment.
	We test recoverability of indefinite-lived intangible assets using a qualitative approach on whether it is more likely than not that the fair value of the intangible asset exceeds its carrying value. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset.
	Other Intangible Assets
	Other intangible assets are carried at cost less accumulated amortization. Amortization is recorded over the estimated useful lives of the assets, generally 12 to 24 months.
	Impairment of Long-Lived Assets
	Long-lived assets, including other intangible assets (excluding indefinite-lived intangible assets), are reviewed for impairment whenever events or changes in circumstances indicate an asset’s carrying value may not be recoverable. If such circumstances are present, we assess the recoverability of the long-lived assets by comparing the carrying value to the undiscounted future cash flows associated with the related assets. If the future net undiscounted cash flows are less than the carrying value of the assets, the assets are considered impaired and an expense, equal to the amount required to reduce the carrying value of the assets to the estimated fair value, is recorded as impairment of intangible assets in the consolidated statements of operations. Significant judgment is required to estimate the amount and timing of future cash flows and the relative risk of achieving those cash flows.
	Assumptions and estimates about future values and remaining useful lives are complex and often subjective. They can be affected by a variety of factors, including external factors such as industry and economic trends, and internal factors such as changes in our business strategy and our internal forecasts. For example, if our future operating results do not meet current forecasts, we may be required to record future impairment charges for acquired intangible assets. Impairment charges could materially decrease our future net income and result in lower asset values on our balance sheet.
	Stock-Based Expense
	Prior to our initial public offering in December 2011, we granted ZSUs to our employees that generally vested upon the satisfaction of service period criteria of up to four years and a liquidity condition, the latter of which was satisfied in connection with our initial public offering. The ZSUs have a contractual term of seven years. Because the liquidity condition was not satisfied until our initial public offering, in prior periods, we had not recorded any expense associated with ZSU grants.
	For ZSUs granted prior to our initial public offering, and for awards subject to a performance condition, we recognize stock-based compensation expense using the accelerated attribution method, net of estimated forfeitures, in which compensation cost for each vesting tranche in an award is recognized ratably from the service inception date to the vesting date for that tranche. For ZSUs granted after the initial public offering, which will only be subject to a service condition, we recognize stock-based expense on a ratable basis over the requisite service period for the entire award.
	We estimate the fair value of stock options using the Black-Scholes option-pricing model. This model requires the use of the following assumptions: (i) expected volatility of our Class A common stock, which is based on our peer group in the industry in which we do business; (ii) expected life of the option award, which we elected to calculate using the simplified method; (iii) expected dividend yield, which is 0%, as we have not paid and do not anticipate paying dividends on our common stock; and (iv) the risk-free interest rate, which is based on the U.S. Treasury yield curve in effect at the time of grant with maturities equal to the grant’s expected life. Option grants have a contractual term of 10 years and generally vest over four years, with 25% vesting after one year and the remainder vesting monthly thereafter over 36 months.
	Stock-based expense is recorded net of estimated forfeitures so that expense is recorded for only those stock-based awards that we expect to vest. We estimate forfeitures based on our historical forfeiture of equity awards adjusted to reflect future changes in facts and circumstances, if any. We will revise our estimated forfeiture rate if actual forfeitures differ from our initial estimates. We record stock-based expense for stock options on a straight-line basis over the vesting term.
	For stock options issued to non-employees, including consultants, we record expense related to stock options equal to the fair value of the options calculated using the Black-Scholes model over the service performance period. The fair value of options granted to non-employees is remeasured over the vesting period and recognized as an expense over the period the services are received.
	Income Taxes
	We account for income taxes using an asset and liability approach, which requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effects of future changes in tax laws or rates are not anticipated. If necessary, the measurement of deferred tax assets is reduced by the amount of any tax benefits that are not expected to be realized based on available evidence. We account for uncertain tax positions by reporting a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. We recognize interest and penalties, if any, related to unrecognized tax benefits in income tax expense.
	Foreign Currency Transactions
	Generally, the functional currency of our international subsidiaries is the U.S. dollar. For these subsidiaries, foreign currency denominated monetary assets and liabilities are remeasured into U.S. dollars at current exchange rates and foreign currency denominated nonmonetary assets and liabilities are remeasured into U.S. dollars at historical exchange rates. Gains or losses from foreign currency remeasurement are included in other income (expense), net in the consolidated statements of operations. For foreign subsidiaries where the functional currency is the local currency, we use the period-end exchange rates to translate assets and liabilities, and the average exchange rates to translate revenues and expenses into U.S. dollars. We record translation gains and losses in accumulated other comprehensive income (loss) as a component of stockholders’ equity.
	Concentration of Credit Risk and Significant Customers
Financial instruments, which potentially expose us to concentrations of credit risk, consist primarily of cash and cash equivalents, short-term and long-term marketable securities, and accounts receivable. Substantially all of our cash, cash equivalents and short-term marketable securities are maintained with three financial institutions with high credit standings. We perform periodic evaluations of the relative credit standing of these institutions.
Accounts receivable are unsecured and represent amounts due to us based on contractual obligations where a signed and executed contract or click-through agreement exists. In cases where we are aware of circumstances that may impair a specific customer’s ability to meet its financial obligations, we record a specific allowance as a reduction to the accounts receivable balance to reduce it to its net realizable value.
Facebook is a significant distribution, marketing, promotion and payment platform for our social games. A significant portion of our 2013, 2012 and 2011 revenue was generated from players who accessed our games through Facebook. As of December 31, 2013 and December 31, 2012, 41% and 58% of our accounts receivable, respectively, were amounts owed to us by Facebook.
Advertising Expense
Costs for advertising are expensed as incurred. Advertising costs, which are included in sales and marketing expense, primarily consisting of player acquisition costs, totaled $60.6 million, $102.2 million and $102.6 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Recent Accounting Pronouncements
In June 2013, the Financial Accounting Standards Board ratified Emerging Issues Task Force (“EITF”) Issue 13-C, “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 will adopt this amendment in the first quarter of 2014. We do not expect our adoption of this standard to have a material impact on our financial statements.

Cash_and_Investments

Cash and Investments	12 Months Ended
	Dec. 31, 2013
Cash And Cash Equivalents [Abstract]	'
Cash and Investments	'
	2. Cash and Investments
	Cash and investments consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Cash and cash equivalents:
	Cash	$	116,102	$	137,104
	Money market funds		349,421		226,993
	Corporate debt securities		—		21,852
	Total cash and cash equivalents	$	465,523	$	385,949
	Marketable securities:
	U.S. government and government agency debt securities	$	333,741	$	464,815
	Corporate debt securities		731,324		796,316
	Municipal securities		11,382		5,233
	Total	$	1,076,447	$	1,266,364
	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):
		December 31, 2013
		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
		31-Dec-12
		Amortized		Gross			Gross			Aggregate
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	U.S. government and government agency debt securities	$	464,517	$	303		$	(5	)	$	464,815
	Corporate debt securities		795,962		524			(170	)		796,316
	Municipal securities		5,234		—			(1	)		5,233
	Total	$	1,265,713	$	827		$	(176	)	$	1,266,364
	The estimated fair value of available-for-sale marketable securities, classified by their contractual maturities was as follows (in thousands):
		December 31,		December 31,
		2013		2012
	Due within one year	$	659,973	$	898,821
	After one year through three years		416,474		367,543
	Total	$	1,076,447	$	1,266,364
	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. None of these securities were in a continuous unrealized loss position for more than 12 months.
		December 31, 2013					December 31, 2012
		Fair Value		Unrealized loss			Fair Value			Unrealized loss
	U.S. government and government agency debt securities	$	98,787	$	(51	)	$	43,404		$	(5	)
	Corporate debt securities		142,071		(257	)		371,243			(170	)
	Municipal securities		—		—			3,063			(1	)
	Total	$	240,858	$	(308	)	$	417,710		$	(176	)
	As of December 31, 2013 and 2012, 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	12 Months Ended
	Dec. 31, 2013
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, accounts receivable, long-term debt and, at December 31, 2012, an interest rate swap. Accounts receivable, net and long-term debt are stated at their 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. Interest rate swaps are estimated using expected cash flows related to our interest rate swap agreement, appropriately discounted considering the uncertainties associated with the terms of the loan agreement and interest rate swap agreement.
	We determined the fair value of our interest rate swap as of December 31, 2012 by calculating the net present value of the fixed and variable future cash flows of the swap agreement, which was based on the swap’s stated rate and current market interest rates, respectively.
	Our non-financial assets, such as intangible assets and property, plant and equipment, are recorded at carrying value unless we determine an asset to be impaired and recognize an impairment charge to adjust the asset to its fair value. In the third quarter of 2012, we made the decision to discontinue development of certain games associated with technology and other intangible assets previously acquired from OMGPOP. Our updated financial forecast as of September 30, 2012 indicated a reduction of undiscounted cash flows expected to be generated from these intangible assets, and we therefore performed an impairment analysis. We determined the estimated fair value of these assets to be $95.5 million lower than their carrying value as of September 30, 2012. Accordingly, we recorded this amount as an impairment charge in our consolidated statements of operations and stated the related OMGPOP intangibles at their fair value of $5.3 million on our consolidated balance sheets as of September 30, 2012. The impaired intangible assets were classified as Level 3 assets within the fair value hierarchy on September 30, 2012 due to the unobservable inputs that were factored into our income-based valuation analysis used to determine their fair value at the time. The primary input used in determining the fair value of the intangible assets was the estimated undiscounted future cash flows associated with those assets as of September 30, 2012. As of December 31, 2013 and December 31, 2012, OMGPOP intangibles were stated at their adjusted amortized basis of $0 and $4.6 million, respectively, within our consolidated balance sheets.
	Our updated financial forecast as of September 30, 2013, indicated a reduction of future undiscounted cash flows for certain games associated with intangible assets previously acquired through various business combinations. As a result, we performed an impairment analysis and recorded an impairment charge of $10.2 million in the third quarter of 2013 to reduce the carrying value of these assets to zero. The primary input used in determining the fair value of these intangible assets was the estimated undiscounted future cash flows associated with those assets as of September 30, 2013.
	Contingent consideration represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisition of Spooky Cool Labs LLC that is contingent upon the achievement of certain performance milestones. 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 fourth quarter of 2013, we updated this analysis and recorded the change in estimated fair value of the contingent consideration liability as an expense of approximately $0.9 million within total costs and expenses in our consolidated statement of income. The significant unobservable inputs used in the fair value measurement of the acquisition-related contingent consideration payable are forecasted future cash flows, the timing of those cash flows, and the probability assumptions associated with such 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. 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 and our impaired intangible assets among the three Levels of the fair value hierarchy are as follows (in thousands):
			December 31, 2013
			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	$	—
	-1	Includes amounts classified as cash and equivalents
			31-Dec-12
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds(1)		$	226,993	$	—	$	—	$	226,993
	U.S. government and government agency debt securities			—		464,815		—		464,815
	Corporate debt securities(1)			—		818,167		—		818,167
	Municipal securities			—		5,234		—		5,234
	Total		$	226,993	$	1,288,216	$	—	$	1,515,209
	Liabilities
	Interest rate swap agreements		$	—	$	2,423	$	—	$	2,423
	-1	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	4. Property and Equipment
	Property and equipment consist of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Computer equipment	$	225,063		$	294,208
	Software		27,668			28,594
	Land		89,130			89,130
	Building		192,512			190,931
	Furniture and fixtures		11,303			13,959
	Leasehold improvements		11,695			20,383
			557,371			637,205
	Less accumulated depreciation		(208,578	)		(171,131	)
	Total property and equipment, net	$	348,793		$	466,074
	Changes in estimated life
	In the third quarter of 2013, due to changing longer term capacity needs and our focus on driving efficiencies, we changed our estimate of the remaining economic life of certain computer equipment and leasehold improvements in one of our data centers that had a carrying value of $11.9 million as of June 30, 2013 from approximately 11 months to approximately four months. As a result of this change in estimate, we recorded $5.3 million of incremental depreciation expense in 2013, and recorded a gain of $1.5 million within other income (expense) in our consolidated statements of operations upon selling these assets in the fourth quarter of 2013.
	In the fourth quarter of 2013, we also changed our estimate of the remaining economic life of certain computer equipment and leasehold improvements in two of our data centers, from approximately 10 months to approximately five months. The carrying value of these assets as of September 30, 2013 was $27.1 million and as of December 31, 2013 was $14.6 million. As a result of this change in estimate, we recorded $4.9 million of incremental depreciation expense in the fourth quarter of 2013.
	2012 Acquisition of Corporate Headquarters Building
	In April, 2012, we purchased our corporate headquarters building located in San Francisco, California from 650 Townsend Associates, LLC to support the overall growth of our business. Pursuant to the agreement, we also acquired existing third-party leases and other intangible property and terminated our existing office leases with the seller. In accordance with ASC 805, Business Combinations, we accounted for the building purchase as a business combination. The purchase consideration for the corporate headquarters building was as follows (in thousands):
	Cash	$	233,700
	Gain on termination of below-market lease		41,058
	Total purchase consideration	$	274,758
	The gain on the termination of the below-market lease represents the difference between the contractual minimum rental payments owed under our previously-existing leases and the market rates of those same leases. The following table summarizes the fair values of net tangible and intangible assets acquired (in thousands):
	Building	$	182,644
	Land		89,130
	Acquired lease intangibles		2,984
	Total	$	274,758
	In addition to the gain recognized on the termination of the below-market lease, we recognized a gain of $25.1 million from the write-off of deferred rent liability and we recognized a loss of $46.2 million resulting from the write-off of leasehold improvements, as any value ascribed to these leasehold improvements were reflected in the fair value of the net tangible and intangible assets acquired. These amounts have been included in other income (expense), net in our consolidated statements of operations.
	We have included the rental income from third party leases with other tenants in the building, and the proportionate share of building expenses for those leases, in other income (expense), net in our consolidated results of operations from the date of acquisition. These amounts were not material for the periods presented. The estimated useful life for the building is 39 years and is being amortized on a straight-line basis.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	5. Acquisitions
	2013 Acquisitions
	On June 19, 2013, we acquired Spooky Cool Labs LLC (“Spooky Cool Labs”), a developer of social casino games, for purchase consideration of approximately $30.6 million, which consisted of cash paid of $19.8 million and contingent consideration with an acquisition date fair value of $10.8 million (see Note 3 for changes in this estimate). The contingent consideration may be payable based on the achievement of certain future performance targets during the two year period following the acquisition date and could be up to $100 million.
	For further details on our fair value methodology with respect to contingent consideration liabilities, see Note 3 — Fair Value.
	The following table summarizes the purchase date fair value of net tangible and intangible assets acquired from Spooky Cool Labs (in thousands, unaudited):
		Total
	Developed technology	$	7,500
	Net tangible assets acquired (liabilities assumed)		2,612
	Goodwill		20,441
	Total	$	30,553
	Goodwill, which is deductible for 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.
	2012 Acquisitions
	Acquisition of OMGPOP. In March 2012, we acquired 100% of the outstanding stock of OMGPOP, a provider of social games for mobile phones, tablets, PCs and social network sites, for purchase consideration of approximately $183.1 million in cash. We acquired OMGPOP to expand our social games offerings, particularly on mobile platforms. Goodwill from the acquisition represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes. Goodwill recorded in connection with this acquisition is primarily attributable to the assembled workforce of the acquired business and expected synergies at the time of the acquisition.
	Other Acquisitions. During the year ended December 31, 2012, we acquired four companies in addition to OMGPOP for an aggregate purchase price of $24.1 million, $23.9 million of which was paid in cash and the remainder in issuance of $0.2 million in restricted shares of our Class A common stock.
	Pro forma results of operations related to our 2013 and 2012 acquisitions have not been presented because they are not material to our 2013 or 2012 consolidated statements of operations, either individually or in the aggregate.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
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, 2011to December 31, 2013 are as follows (in thousands):
	Goodwill – December 31, 2011	$	91,765
	Additions		117,541
	Foreign currency translation adjustments		(487	)
	Goodwill adjustments		136
	Goodwill – December 31, 2012		208,955
	Additions		20,441
	Foreign currency translation adjustments		(1,407	)
	Goodwill – December 31, 2013	$	227,989
	The details of our acquisition-related intangible assets are as follows (in thousands):
		December 31, 2013
		Gross Carrying			Accumulated			Net Book
		Value			Amortization			Value
	Developed technology	$	79,652		$	(73,402	)	$	6,250
	Trademarks, branding and domain names		15,199			(5,668	)		9,531
	Acquired lease intangibles		5,707			(3,206	)		2,501
	Total	$	100,558		$	(82,276	)	$	18,282
		31-Dec-12
		Gross Carrying			Accumulated			Net Book Value
		Value			Amortization
	Developed technology	$	81,295		$	(63,428	)	$	17,867
	Trademarks, branding and domain names		15,519			(4,012	)		11,507
	Acquired lease intangibles		5,707			(1,418	)		4,289
	Total	$	102,521		$	(68,858	)	$	33,663
	These assets were, and continue to be, amortized on a straight-line basis. As of December 31, 2013, the weighted-average remaining useful lives of all identified acquired intangible assets were 2.5 years for developed technology, 2.2 years for trademarks, branding, and domain names, and 3.8 years for acquired lease intangibles. Amortization expense of intangible assets for the years ended December 31, 2013, 2012 and 2011 were $12.2 million, $42.3 million and $29.5 million, respectively. As of December 31, 2013, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2014	$	5,264
	2015		4,181
	2016		2,139
	2017 and thereafter		578
	Total	$	12,162

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	Income (loss) before income tax expense consists of the following for the periods shown below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	United States	$	(56,215	)	$	(41,963	)	$	(379,800	)
	International		(8,654	)		(117,612	)		(26,342	)
	Total	$	(64,869	)	$	(159,575	)	$	(406,142	)
	Income tax expense (benefit) consists of the following for the periods shown below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Current:
	Federal	$	(12,222	)	$	84,421		$	(8,988	)
	State		(105	)		5,431			1,195
	Foreign		3,206			3,862			1,600
	Total current tax expense		(9,121	)		93,714			(6,193	)
	Deferred:
	Federal		(17,847	)		(40,331	)		4,687
	State		(115	)		(2,821	)		441
	Foreign		(804	)		(689	)		(761	)
	Total deferred tax expense (benefit)		(18,766	)		(43,841	)		4,367
	Provision for (benefit from) income taxes	$	(27,887	)	$	49,873		$	(1,826	)
	The reconciliation of federal statutory income tax provision (benefit) to our effective income tax provision is as follows (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Expected provision (benefit) at U.S. federal statutory rate	$	(22,704	)	$	(55,837	)	$	(142,166	)
	State income taxes—net of federal benefit		(15,947	)		(370	)		(6,340	)
	Income taxed at foreign rates		4,024			48,427			6,338
	Stock-based compensation		6,741			29,998			43,064
	Tax credits		(39,593	)		(8,026	)		(34,769	)
	Tax reserve for uncertain tax positions		30,224			48,252			29,303
	Change in valuation allowance		28,354			(8,005	)		101,489
	Change in earnings mix		(16,306	)		—			—
	Impact of change in tax rates		(1,530	)		(566	)		(205	)
	Acquisition costs		(1,480	)		(4,960	)		397
	Other		330			960			1,063
		$	(27,887	)	$	49,873		$	(1,826	)
	We have not provided U.S. income taxes and foreign withholding taxes on the undistributed earnings of our profitable foreign subsidiaries as of December 31, 2013 because we intend to permanently reinvest such earnings outside the United States. If these foreign earnings were to be repatriated in the future, the related U.S. tax liability may be reduced by any foreign income taxes previously paid on these earnings. As of December 31, 2013, the cumulative amount of earnings upon which U.S. income taxes have not been provided is approximately $2.4 million.
	Deferred tax assets and liabilities consist of the following (in thousands):
		Year Ended December 31,
		2013			2012
	Deferred tax assets:
	Tax credit carryforwards	$	60,745		$	27,502
	Equity based compensation		28,164			68,644
	Net operating loss carryforwards		14,892			12,810
	Acquired intangible assets		7,183			—
	Accrued expenses		6,856			2,764
	Deferred revenue		5,984			16,200
	Charitable contributions		5,130			4,836
	Deferred rent		4,620			6,014
	State taxes		2,725			2,765
	Other		679			1,926
	Other accrued compensation		190			5,031
	Valuation allowance		(92,095	)		(90,382	)
	Net deferred tax assets		45,073			58,110
	Deferred tax liabilities:
	Depreciation		(21,356	)		(52,252	)
	Prepaid expenses		—			(320	)
	Net deferred tax liabilities		(21,356	)		(52,572	)
	Net deferred taxes	$	23,717		$	5,538
		Year Ended December 31,
		2013			2012
	Recorded as:
	Current deferred tax assets	$	16,293		$	30,122
Non-current deferred tax assets		7,424			—
Non-current deferred tax liabilities		—			(24,584	)
Net deferred tax assets	$	23,717		$	5,538
In determining the need for a valuation allowance, we weigh both positive and negative evidence in the various taxing jurisdictions in which it operates to determine whether it is more likely than not that deferred tax assets are recoverable. In assessing the ultimate realizability of net deferred tax assets, we consider our past performance, available tax strategies, and expected future taxable income. At December 31, 2013 and December 31, 2012, we recorded a valuation allowance of $92.1 million and $90.4 million, respectively, against our net deferred tax assets, as we believe it is more likely than not that these benefits will be not be realized.
Net operating loss and tax credit carryforwards as of December 31, 2013 are as follows (in thousands):
	Amount			Expiration years
Net operating losses, federal	$	283,150			2029 - 2033
Net operating losses, state	$	203,175			2022 - 2033
Tax credit, federal	$	73,560			2021 - 2023
Tax credits, state	$	43,662			2018 - indefinite
Net operating losses, foreign	$	—			2018 - 2020
Tax credits, foreign	$	—			2018 - 2019
Pursuant to authoritative guidance, the benefit of stock options will only be recorded to stockholders’ equity when cash taxes payable is reduced. As of December 31, 2013, the portion of net operating loss carryforwards related to stock options is approximately $397.1 million, the benefit of which will be credited to additional paid-in capital when realized. The federal and state net operating loss carryforwards are subject to various annual limitations under Section 382 of the Internal Revenue Code.
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
December 31, 2010	$	15,183
Additions based on tax positions related to 2011		30,841
Additions for tax positions of prior years		2,318
Reductions for tax positions of prior years		(9	)
December 31, 2011		48,334
Additions based on tax positions related to 2012		51,222
Reductions for tax positions of prior years		(835	)
December 31, 2012		98,721
Additions based on tax positions related to 2013		16,414
Additions for tax positions of prior years		18,356
December 31, 2013	$	133,491
As of December 31, 2013, of that amount, approximately $61.8 million represents the amount of unrecognized tax benefits that would, if recognized, impact our effective income tax rate.
We classify uncertain tax positions as non-current income tax liabilities unless expected to be paid within one year or otherwise directly related to an existing deferred tax asset, in which case the uncertain tax position is recorded net of the asset on the balance sheet. These non-current income tax liabilities are classified in other non-current liabilities on the consolidated balance sheets. We do not expect any unrecognized tax benefits to be recognized within the next 12 months. We recognize interest and penalties in income tax expense. As of December 31, 2013 and December 31, 2012, the total balance of accrued interest and penalties related to uncertain tax positions was $0.5 million and $0.1 million, respectively.
We file income tax returns in the United States, including various state and local jurisdictions. Our subsidiaries file tax returns in various foreign jurisdictions, including Canada, China, Germany, Japan, India, United Kingdom, and Ireland. We are subject to examination by U. S. Federal, state or foreign tax authorities for all years since our inception in 2007.

Longterm_Debt_and_Derivative_F

Long-term Debt and Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-term Debt and Derivative Financial Instruments	'
	8. Long-term Debt and Derivative Financial Instruments
	In June, 2012, we entered into an agreement for a term loan of $100.0 million due June 30, 2017, at a variable interest rate of three month LIBOR plus 0.75 percent. Interest payments were made quarterly and the three month LIBOR reset once per quarter. The amounts borrowed were collateralized by our corporate headquarters building. Concurrent with the execution of the loan agreement, to eliminate variability in interest payments, we entered into an interest rate swap agreement, such that the interest rate would be fixed at two percent. We designated the interest rate swap as a qualifying hedging instrument and accounted for it as a cash flow hedge in accordance with ASC 815. In April 2013, we fully repaid our outstanding long-term debt of $100 million and all accrued interest. Concurrent with our repayment of the debt, we also terminated the related interest rate swap agreement. As a result, we recorded a realized loss of $2.4 million in other income (expense), net in the consolidated statements of operations.
	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 December 31, 2013, we have not drawn down any amounts under the credit facility and are in compliance with these covenants.

Other_Current_Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]	'
Other Current Liabilities	'
	9. Other Current Liabilities
	Other current liabilities consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Customer deposits	$	5,809	$	25,671
	Accrued escrow for acquisitions		6,122		32,568
	Other		56,935		88,644
	Total other current liabilities	$	68,866	$	146,883
	Customer deposits represent amounts received for unredeemed game cards as well as advanced payments from various customers. Accrued escrow from acquisitions mainly relates to amounts held in escrow under the terms of certain of our acquisition agreements. Other liabilities include various expenses that we accrue for transaction taxes, compensation liabilities, restructuring charges and accrued accounts payable.

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2013
Restructuring And Related Activities [Abstract]	'
Restructuring	'
	10. Restructuring
	2013 Restructuring Plans
	During 2013, we reduced our work force by approximately 550 employees and closed or exited certain office and data-center facilities as part of an overall plan to better align our cost structure against market opportunities. As a result, we recorded restructuring charges of $42.9 million in the year ended December 31, 2013 which is included in operating expenses in our consolidated statement of operations. This restructuring charge was composed of $25.6 million of employee severance, $15.7 million related to non-cancelable contracts and $1.6 million related to other non-cash charges, and does not include the impact of $16.6 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 2013 restructuring plans as of December 31, 2013 was $13.5 million. This remaining liability substantially relates to cancelled contracts and exited facilities that have lease terms which expire over the next four years.
	2012 Restructuring Plan
	During the fourth quarter of 2012, we implemented certain cost reduction initiatives, including a workforce reduction of 155 employees and the consolidation of certain real estate facilities which resulted in our exit from certain facilities for which we had non-cancellable operating leases.
	For the year ended December 31, 2012, we recorded $7.9 million in restructuring charges in operating expenses within our consolidated statement of operations, which includes employee severance costs of $7.0 million and other expenses of $0.9 million. This restructuring charge did not include the impact of $6.9 million of 2012 stock-based expense reversals associated with employee terminations as a result of our restructuring, which were recognized in operating expenses within our consolidated statements of operations.
	For the year ended December 31, 2013, we recorded $1.7 million in restructuring charges related to our 2012 restructuring plan. This restructuring charge did not include the impact of $0.2 million of 2012 stock-based expense reversals associated with employee terminations as a result of our restructuring, which were recognized in operating expenses within our consolidated statement of operations. As of December 31, 2013, there were no future payments remaining related to the 2012 restructuring plan.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	11. Stockholders’ Equity
	Common Stock
	Our three classes of common stock are Class A common stock, Class B common stock and Class C common stock. The following are the rights and privileges of our classes of common stock:
	Dividends. The holders of outstanding shares of our Class A, Class B and Class C common stock are entitled to receive dividends out of funds legally available at the times and in the amounts that our Board of Directors (the “Board”) may determine.
	Voting Rights. Holders of our Class A common stock are entitled to one vote per share, holders of our Class B common stock are entitled to seven votes per share and holders of our Class C common stock are entitled to 70 votes per share. In general, holders of our Class A common stock, Class B common stock and Class C common stock will vote together as a single class on all matters submitted to a vote of stockholders, unless otherwise required by law. Delaware law could require either our Class A common stock, Class B common stock or our Class C common stock to vote separately as a single class in the following circumstances:
		•		If we were to seek to amend our Certificate of Incorporation to increase the authorized number of shares of a class of stock, or to increase or decrease the par value of a class of stock; and
		•		If we were to seek to amend our Certificate of Incorporation in a manner that altered or changed the powers, preferences or special rights of a class of stock in a manner that affected its holders adversely.
	Liquidation. Upon our liquidation, dissolution or winding-up, the assets legally available for distribution to our stockholders would be distributable ratably among the holders of our Class A, Class B and Class C common stock.
	Preemptive or Similar Rights. None of our Class A, Class B or Class C common stock is entitled to preemptive rights, and neither is subject to redemption.
	Conversion. Our Class A common stock is not convertible into any other shares of our capital stock. Each share of our Class B common stock and Class C common stock is convertible at any time at the option of the holder into one share of our Class A common stock. In addition, after the closing of the initial public offering, upon sale or transfer of shares of either Class B common stock or Class C common stock, whether or not for value, each such transferred share shall automatically convert into one share of Class A common stock, except for certain transfers described in our amended and restated certificate of incorporation. Our Class B common stock and Class C common stock will convert automatically into Class A common stock on the date on which the number of outstanding shares of Class B common stock and Class C common stock together represent less than 10% of the aggregate combined voting power of our capital stock. Once transferred and converted into Class A common stock, the Class B common stock and Class C common stock may not be reissued.
	Stock Repurchases
	In October 2012, our Board authorized a $200 million stock repurchase program. We initiated purchases under this program in December 2012. As of December 31, 2013, we had repurchased $21.1 million of our Class A common stock under our stock repurchase program and the remaining authorized amount of stock repurchases that may be made under this plan was $178.9 million. In 2013, we used $9.3 million to repurchase an aggregate of 3.4 million shares of our Class A common stock at an average purchase price of $2.74 per share.
	Warrants
	In June 2011, in connection with a service arrangement with a related party, we issued a warrant to purchase 1.0 million shares of our Class B common stock at an exercise price of $0.05 per share. We determined the fair value of the warrant using the Black-Scholes option-pricing model and revalued this warrant each quarter as services were performed and expensed the portion of the warrant that vested each period. We recorded $14.0 million and $1.7 million of expense related to this warrant in 2011and 2012, respectively. In June 2011, the service provider fully exercised the warrant, and in April 2012, the warrant fully vested.
	Equity Incentive Plans and Stock-Based Expense
	In 2007, we adopted the 2007 Equity Incentive Plan (the “2007 Plan”) for the purpose of granting stock options and ZSUs to employees, directors and non-employees. Concurrent with the effectiveness of our initial public offering on December 15, 2011, we adopted the 2011 Equity Incentive Plan (the “2011 Plan”), and all remaining common shares reserved for future grant or issuance under the 2007 Plan were added to the 2011 Plan. The 2011 Plan was adopted for purposes of granting stock options and ZSUs to employees, directors and non-employees. As of December 31, 2013 68.7 million shares of our Class A common stock were reserved for future issuance under our 2011 Plan. The number of shares of our Class A common stock reserved for future issuance under our 2011 Plan will automatically increase on January 1 of each year, beginning on January 1, 2012, and continuing through and including January 1, 2021, by 4% of the total number of shares of our capital stock outstanding as of December 31 of the preceding calendar year.
	The following table presents the weighted-average grant date fair value of stock options and the related assumptions used to estimate the fair value in our consolidated financial statements:
			Year Ended December 31,
			2013			2012			2011
	Expected term, in years			7			6			6
	Risk-free interest rates			2.05			0.67	%		2.04	%
	Expected volatility			49	%		62	%		64	%
	Dividend yield			—			—			—
	Weighted-average estimated fair value of options granted during the year		$	1.82		$	1.58		$	4.17
	We recorded stock-based expense related to grants of employee and consultant stock options, warrants, restricted stock and ZSUs in our consolidated statements of operations as follows (in thousands):
			Year Ended December 31,
			2013			2012			2011
	Cost of revenue		$	468		$	12,116		$	17,660
	Research and development			61,931			200,640			374,920
	Sales and marketing			8,079			24,684			81,326
	General and administrative			13,915			44,546			126,306
	Total stock-based expense		$	84,393		$	281,986		$	600,212
	In the twelve months ended December 31, 2013 and 2012 we recognized $54.7 million and $204.7 million of stock-based expense associated with ZSUs, respectively. Unamortized stock-based compensation relating to ZSUs amounted to $222.6 million as of December 31, 2013 over a weighted-average recognition period of 2.77 years.
	Shares granted in 2013 included 17.5 million performance-based ZSUs granted as part of our executive compensation plan with vesting that was dependent on the achievement of certain 2013 annual performance metrics in addition to the passage of time. 10.7 million of these grants were forfeited on or prior to December 31, 2013 due to executive departures prior to vesting and due to the degree of achievement of the performance criteria. We recorded $3.0 million of stock-based expense related to this plan in the twelve months ended December 31, 2013. Subsequent to December 31, 2013, our Board approved the final cash and equity payouts under this plan. Accordingly, 4.5 million shares granted during 2013 will be reflected as forfeited during the first quarter of 2014.
	In March 2012, we donated one million shares of Class A common stock to Zynga.org, an unaffiliated non-profit organization that was formed in March 2012 to support charitable causes in the communities in which we conduct business. Zynga.org is a separate legal entity in which we have no financial interest and do not exercise control and, accordingly, is not consolidated in our consolidated financial statements. For our contribution of Class A common stock we recorded $13.1 million of stock-based expense, which is included in general and administrative expenses, equal to the fair value of the shares of Class A common stock issued.
	As of December 31, 2013, total unrecognized stock-based expense of $27.6 million and $15.0 million related to unvested stock options and restricted shares of common stock, respectively, is expected to be recognized over a weighted-average recognition period of approximately 3.42 and 2.03 years, respectively.
	The following table shows stock option activity for the year ended December 31, 2013 (in thousands, except weighted-average exercise price and remaining 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, 2012			80,819		$	1.52		$	100,225			7.43
	Granted			7,557			3.56
	Forfeited and cancelled			(16,962	)		2.75
	Exercised			(30,333	)		0.6
	Balance as of December 31, 2013			41,081		$	2.07		$	83,089			7.02
	As of December 31, 2013
	Exercisable options			23,125		$	0.88		$	67,443			5.79
	Vested and expected to vest			35,591		$	1.55		$	80,036			6.8
	The aggregate intrinsic value of options exercised during the years ended December 31, 2013, 2012, and 2011 was $85.9 million, $222.4 million, and $78.2 million, respectively. The total grant date fair value of options that vested during the years ended December 31, 2013, 2012, and 2011 was $12.8 million, $7.6 million, and $17.5 million, respectively.
	The following table shows a summary of ZSU activity for the year ended December 31, 2013 (in thousands, except weighted-average fair value and remaining term):
			Outstanding ZSUs
			Shares			Weighted-			Aggregate
						Average			Intrinsic Value of
						Grant Date			Unvested ZSUs
						Fair Value
	Unvested as of December 31, 2012			56,648		$	9.56		$	133,690
	Granted			76,602			3.33
	Vested			(23,339	)		8.62
	Forfeited and cancelled			(42,914	)		6.14
	Unvested as of December 31, 2013			66,997		$	4.96		$	254,589
	2011 Employee Stock Purchase Plan
Our 2011 Employee Stock Purchase Plan (“2011 ESPP”), was approved by our Board in September 2011 and by our stockholders in November 2011 and amended in August 2012. On December 31, 2013, the maximum number of shares of our Class A common stock that were authorized to be issued under our 2011 ESPP was 33.7 million shares. The number of shares of our Class A common stock reserved for future issuance under our 2011 ESPP will automatically increase on January 1 of each year, beginning on January 1, 2012, and continuing through and including January 1, 2021, by (i) the lesser of 2% of the total number of shares of our capital stock outstanding as of December 31 of the preceding calendar year or (ii) 25,000,000 shares.
Our 2011 ESPP permits participants to purchase shares of our Class A common stock through payroll deductions up to 15% of their earnings. Unless otherwise determined by the administrator, the purchase price of the shares will be 85% of the lower of the fair market value of our Class A common stock on the first day of an offering or on the date of purchase. The ESPP offers a twelve-month look-back. The ESPP contains an automatic reset feature such that if the fair market value of our Class A common stock has decreased from the original offering date, the offering will automatically terminate and all participants will be re-enrolled in the new, lower-priced offering. Participants may end their participation at any time during an offering and will be refunded their accrued contributions that have not yet been used to purchase shares. Participation ends automatically upon termination of employment with us.
As of December 31, 2013, there were $2.7 million employee contributions withheld by the Company. In 2013, the Company recognized $4.3 million of stock-based expense related to 2011 ESPP.
Common Stock Reserved for Future Issuance
As of December 31, 2013, we had reserved shares of common stock for future issuance as follows (in thousands):
		December 31, 2013
Stock options outstanding			41,081
ZSUs outstanding			66,997
Equity Incentive Plan			68,710
2011 Employee Stock Purchase Plan			33,697
			210,485
Accumulated Other Comprehensive Income (loss)
The components of accumulated other comprehensive income, net of taxes, were as follows (in thousands):
		Year Ended December 31,
		2013			2012			2011
Unrealized gains (losses) on available-for-sale securities		$	213		$	649		$	(91	)
Unrealized gains (losses) on derivative investments			—			(2,423	)		—
Foreign currency translation			(1,259	)		327			453
Total		$	(1,046	)	$	(1,447	)	$	362

Net_Income_Loss_Per_Share_of_C

Net Income (Loss) Per Share of Common Stock	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share of Common Stock	'
	12. Net Income (Loss) Per Share of Common Stock
	We compute net income (loss) per share of common stock using the two-class method required for participating securities. Prior to the date of the initial public offering, we considered all series of our convertible preferred stock to be participating securities due to their non-cumulative dividend rights. Additionally, we consider shares issued upon the early exercise of options subject to repurchase and unvested restricted shares to be participating securities, because holders of such shares have non-forfeitable dividend rights in the event we declare a dividend for common shares. In accordance with the two-class method, net income allocated to these participating securities, which include participation rights in undistributed net income, is subtracted from net income (loss) to determine total net income (loss) to be allocated to common stockholders.
	Basic 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 during the period. In computing diluted net income (loss) attributable to common stockholders, 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 or there is no income attributable to common stockholders, we do not include stock options, warrants and unvested ZSUs in our calculation of diluted net income (loss) per share, as the impact of these awards is anti-dilutive.
	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):
		Year Ended December 31,
		2013									2012									2011
		Class A			Class B			Class C			Class A			Class B			Class C			Class A			Class B			Class C
	BASIC:
	Net income (loss) attributable to common stockholders	$	(29,082	)	$	(6,951	)	$	(949	)	$	(109,643	)	$	(94,007	)	$	(5,798	)	$	(8,522	)	$	(367,051	)	$	(28,743	)
	Weighted-average common shares outstanding		628,947			150,330			20,517			387,995			332,665			20,517			6,083			261,999			20,517
	Basic net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.28	)	$	(0.28	)	$	(0.28	)	$	(1.40	)	$	(1.40	)	$	(1.40	)
	DILUTED:
	Net income (loss) attributable to common stockholders-basic	$	(29,082	)	$	(6,951	)	$	(949	)	$	(109,643	)	$	(94,007	)	$	(5,798	)	$	(8,522	)	$	(367,051	)	$	(28,743	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class B and Class A shares		(949	)		—			—			(5,798	)		—			—			(28,743	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(6,951	)		—			—			(94,007	)		—			—			(367,051	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(36,982	)	$	(6,951	)	$	(949	)	$	(209,448	)	$	(94,007	)	$	(5,798	)	$	(404,316	)	$	(367,051	)	$	(28,743	)
	Weighted -average common shares outstanding-basic		628,947			150,330			20,517			387,995			332,665			20,517			6,083			261,999			20,517
	Conversion of Class C to Class A common shares outstanding		20,517			—			—			20,517			—			—			—			—			—
	Conversion of Class C to Class B common shares outstanding		—			—			—			—			—			—			20,517			—			—
	Conversion of Class B to Class A common shares outstanding		150,330			—			—			332,665			—			—			261,999			—			—
	Weighted -average common shares outstanding-diluted		799,794			150,330			20,517			741,177			332,665			20,517			288,599			261,999			20,517
	Diluted net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.28	)	$	(0.28	)	$	(0.28	)	$	(1.40	)	$	(1.40	)	$	(1.40	)
	The following weighted-average employee 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):
		Year Ended December 31,
		2013			2012			2011
	Stock options		61,154			86,054			103,565
	Warrants		579			695			17,215
	Restricted shares		4,203			14,185			—
	ZSUs		63,794			71,290			47,392
	Total		129,730			172,224			168,172

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	13. Commitments and Contingencies
	Lease Commitments
	We have entered into operating leases for facilities, primarily for data center space. As of December 31, 2013, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2014	$	31,215
	2015		28,359
	2016		22,428
	2017		13,286
	2018 and thereafter		45,814
		$	141,102
	Rent expense on operating leases for facilities for the years ended December 31, 2013, 2012 and 2011 totaled $7.3 million, $11.2 million, and $14.4 million, respectively.
	Other Purchase Commitments
	We have entered into several service contracts for hosting of data systems and payment processing. Future minimum purchase commitments that have initial or remaining non-cancelable terms as of December 31, 2013, are as follows (in thousands):
	Year ending December 31:
	2014	$	4,723
	2015		826
	2016		407
		$	5,956
	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. The consolidated 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 December 16, 2011 and July 25, 2012. The consolidated complaint asserts claims for unspecified damages, and an award of costs and expenses to the putative class, including attorneys’ fees. The defendants’ motions to dismiss were filed on May 31, 2013, and briefing on the motions was completed in August 2013. On September 23, 2013, the court vacated the previously scheduled hearing on the motions and advised that the motions would be decided on the filings. The court’s order does not indicate when a ruling on the motions to dismiss is likely to be issued.
	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 demurrer and motion to stay the action. 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 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. The defendants removed the case to the United States District Court for the District of Delaware on May 10, 2013. On December 23, 2013, the district court granted the plaintiff’s motion to remand the action to the Court of Chancery. On January 8, 2014, the Chancery Court entered a scheduling order. On January 17, 2014, the plaintiff filed an amended complaint. The Company’s deadline to respond to the amended complaint is March 6, 2014.
	The Company believes it has meritorious defenses in the above securities class actions and will vigorously defend these actions.
	Since August 3, 2012, eight 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. 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. 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. 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. 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.
	To date, there has been no discovery or other substantive proceedings in the actions described above. Accordingly, 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.
	On February 10, 2012, an action entitled Personalized Media Communications, LLC v. Zynga Inc., Case No. 2:12-cv-68 was filed against the Company in the United States District Court for the Eastern District of Texas. The plaintiff alleged infringement of four patents by 39 games. On January 25, 2013, the court denied the Company’s motion to transfer the action to the Northern District of California. During the course of the action, the plaintiff narrowed the case for trial to two patents. Plaintiff’s damages expert opined that, if the Company were found to infringe and the patents-in-suit were found to be valid (both of which the Company disputed), the Company should pay damages of approximately $25 million for the period through September 2013. Plaintiff also sought a running royalty on revenue of the allegedly infringing games through 2027-28. The Company disputed the methods employed and the conclusion reached by the plaintiff’s expert. The Company’s damages expert opined that, under the same disputed conditions, the Company should pay $1 million. The action was called for trial in Marshall in the Eastern District of Texas on November 12, 2013. On November 19, 2013, the jury returned a unanimous verdict of non-infringement in favor of the Company. Plaintiff did not file any post-trial motions challenging the jury’s verdict nor a notice of appeal.
	In February 2013, the Company filed four petitions for inter partes review in the United States Patent and Trademark Office before the Patent Trial and Appeal Board (the “PTAB”). The petitions ask the PTAB to review all asserted claims for the four patents that were originally asserted in the Personalized Media Communications litigation action and, based on the referenced prior art, determine them to be invalid. On July 25, 2013, the PTAB issued decisions finding a “reasonable likelihood that Zynga [will] prevail” and authorizing the institution of the Company’s requested inter partes reviews, entered a Scheduling Order, and set oral arguments for April 22, 2014.
	In February 2014, the Company and Personalized Media Communications concluded all remaining legal proceedings and reached an agreement for a comprehensive license to Personalized Media Communications’ entire patent portfolio.
	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	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Geographical Information	'
	14. Geographical Information
	The following represents our revenue based on the geographic location of our players (in thousands):
	Revenue		Year Ended December 31,
			2013		2012		2011
	United States		$	519,819	$	757,299	$	734,469
	All other countries(1)			353,447		523,968		405,631
	Total revenue		$	873,266	$	1,281,267	$	1,140,100
	-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		Year Ended December 31,
			2013		2012		2011
	United States		$	345,598	$	459,906	$	252,552
	All other countries			3,195		6,168		4,188
	Total property and equipment, net		$	348,793	$	466,074	$	256,740

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	15. Subsequent events (unaudited)
	Cost Reduction Plan
	In January 2014, we announced a cost reduction plan that included a reduction in force of 314 employees and the exit of certain facilities. We estimate we will incur approximately $16 million to $18.5 million in pre-tax restructuring expenses in 2014 pursuant to this plan.
	Acquisition of NaturalMotion
	In February 2014, we acquired NaturalMotion Limited, a leading mobile game and technology developer, for consideration including $391 million in cash and the issuance of 39.8 million shares of Zynga Class A Common Stock. Approximately 11.6 million of the 39.8 million shares were issued to continuing employees and are subject to vesting over a three-year period.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation And Qualifying Accounts [Abstract]	'
Valuation and Qualifying Accounts	'
	Schedule II: Valuation and Qualifying Accounts
	Allowance for Doubtful Accounts and Sales Credits	Balance at		Charged to		Write-Offs			Balance at
		Beginning of		Expenses/		Net of			End of Year
		Year		Against Revenue		Recoveries
	Year Ended December 31, 2013	$	160		—	$	(160	)	$	—
	Year Ended December 31, 2012	$	163		—	$	(3	)	$	160
	Year Ended December 31, 2011	$	325		—	$	(162	)	$	163

Overview_and_Summary_of_Signif1

Overview and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
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.
Initial Public Offering	'
	Initial Public Offering
	On December 15, 2011, we completed our initial public offering in which we issued and sold 100 million shares of Class A common stock at a public offering price of $10.00 per share. We raised a total of $961.4 million of net proceeds after deducting underwriter discounts and commissions of $32.5 million and other offering expenses of $6.1 million. Upon the closing of the initial public offering, all shares of the Company’s then-outstanding convertible preferred stock automatically converted into an aggregate of 304.9 million shares of Class B common stock. Additionally, 15.7 million vested restricted stock units (“ZSUs”), after deducting shares withheld to satisfy minimum tax withholding obligations, were automatically converted into Class B common shares.
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 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.
Segments	'
	Segments
	We have one operating segment with one business activity, developing and monetizing social games. Our Chief Operating Decision Maker (“CODM”), our Chief Executive Officer, manages our operations on a consolidated basis for purposes of allocating resources. When evaluating performance and allocating resources, the CODM reviews financial information presented on a consolidated basis, accompanied by disaggregated bookings information for our games.
Revenue Recognition	'
	Revenue Recognition
	We derive revenue from the sale of virtual goods associated with our online games and the sale of advertising.
	Online Game
	We operate our games as live services that allow players to play for free. Within these games, players can purchase virtual currency to obtain virtual goods to enhance their game-playing experience. Players can pay for our virtual currency using Facebook Credits (prior to July 2013) or Facebook local currency payments (beginning July 2013) when playing our games through the Facebook platform, and can use other payment methods such as credit cards or PayPal on other platforms. We also sell game cards that are initially recorded as a customer deposit liability which is included in other current liabilities on the consolidated balance sheet, net of fees retained by retailers and distributors. Upon redemption of a game card in one of our games and delivery of the purchased virtual currency to the player, these amounts are reclassified to deferred revenue. Advance payments from customers that are non-refundable and relate to non-cancellable contracts that specify our obligations are recorded to deferred revenue. All other advance payments that do not meet these criteria are recorded as customer deposits.
	We recognize revenue when all of the following conditions are satisfied: (1) there is persuasive evidence of an arrangement; (2) the service has been provided to the player; (3) the collection of our fees is reasonably assured; and (4) the amount of fees to be paid by the player is fixed or determinable. For purposes of determining when the service has been provided to the player, we have determined that an implied obligation exists to the paying player to continue displaying the purchased virtual goods within the online game over their estimated life or until they are consumed. The proceeds from the sale of virtual goods are initially recorded in deferred revenue. We categorize our virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action. For the sale of consumable virtual goods, we recognize revenue as the goods are consumed, which approximates one month. Durable virtual goods represent virtual goods that are accessible to the player over an extended period of time. We recognize revenue from the sale of durable virtual goods ratably over the estimated average playing period of paying players for the applicable game, which represents our best estimate of the estimated average life of durable virtual goods. If we do not have the ability to differentiate revenue attributable to durable virtual goods from consumable virtual goods for a specific game we recognize revenue on the sale of durable and consumable virtual goods for that game ratably over the estimated average period that paying players typically play that game.
	Prior to October 1, 2009, we did not have the data to determine the consumption dates for our consumable virtual goods or to differentiate revenue attributable to durable virtual goods from consumable virtual goods. Beginning in October 2009, we had sufficient data to separately account for consumable and durable virtual goods in one of our games, thus allowing us to recognize revenue related to consumable goods upon consumption. Since January 2010, we have had this data for substantially all of our web games, thus allowing us to recognize revenue related to consumable goods upon consumption for our web-based games. However, for our stand-alone mobile games, we do not have the requisite data to separately account for consumable and durable virtual goods and have therefore recorded mobile revenue ratably over the estimated average payer life. We expect that in future periods there will be changes in the mix of durable and consumable virtual goods sold, reduced virtual good sales in some existing games, changes in estimates in average paying payer life and/or changes in our ability to make such estimates. When such changes occur, and in particular if more of our revenue in any period is derived from goods for which revenue is recognized over the estimated average playing period, or that period increases on average, the amount of revenue that we recognize in a future period may be reduced, perhaps significantly.
	Future usage patterns may differ from historical usage patterns and therefore the estimated average playing periods may change in the future. We assess the estimated average playing period for paying players and the estimated average life of our virtual goods quarterly. Changes in estimated average playing period for paying players in 2013 resulted in an increase in revenue of $12.3 million and will result in an offsetting reduction of 2014 revenue in the same amount.
	We estimate chargebacks from Facebook and third-party payment processors to account for potential future chargebacks based on historical data and record such amounts as a reduction of revenue.
	From July 2010 through the third quarter of 2013, Facebook’s proprietary virtual currency, Facebook Credits, was the primary in-game payment method for our games played on the Facebook platform. Under the terms of our agreement with Facebook, Facebook set the price our players pay for Facebook Credits and collected the funds from the sale of Facebook Credits. Facebook’s stated face value of a Facebook Credit was $0.10. For each Facebook Credit purchased by our players and redeemed in our games, Facebook remitted to us $0.07, which is the amount we recognized as revenue. Accordingly, we recognized revenue net of the amounts retained by Facebook related to Facebook Credits transactions because we did not set the pricing of Facebook Credits sold to the players of our games on Facebook. In July 2013, Facebook began to transition payments made on the Facebook platform from Facebook Credits to Facebook’s local currency-based payments program. This transition was completed in the fourth quarter of 2013. Under the terms of our agreement, Facebook remits to us 70% of the price we request to be charged to the game player for each transaction. We recognize revenue net of the amounts retained by Facebook related to Facebook local currency-based payments because Facebook may choose to alter our recommended price, for example by offering a discount or other incentives to players playing on their platform. Additionally we do not receive information from Facebook indicating the amount of such discounts offered to our paying players or regarding the actual cash paid by our players to Facebook. Accordingly, we are unable to determine the gross amount paid by our players to Facebook. Prior to the implementation of Facebook Credits in our games, players could purchase our virtual goods through various widely accepted payment methods offered in the games and we recognized revenue based on the transaction price paid by the player.
	For revenue earned through certain mobile platforms, including Apple iOS and Google Android, we recognize online game revenue based on the gross amount paid by the player because we are the primary obligor and we have the contractual right to determine the price to be paid by the player. We record the related platform and payment processing fees as cost of revenue in the period incurred.
	Advertising
	We have contractual relationships with agencies, advertising brokers and certain advertisers for advertisements within our games. We recognize advertising revenue for branded virtual goods and sponsorships, engagement advertisements and offers, mobile advertisements and other advertisements as advertisements are delivered to customers as long as evidence of the arrangement exists (executed contract), the price is fixed or determinable, and we have assessed collectability as reasonably assured. Certain branded in-game sponsorships that involve virtual goods are deferred and recognized over the estimated life of the branded virtual good or as consumed, similar to online game revenue. Price is determined to be fixed and determinable when there is a fixed price in the applicable evidence of the arrangement, which may include a master contract, insertion order, or a third party statement of activity. For branded virtual goods and sponsorships, we determine the delivery criteria has been met based on delivery information from our internal systems or from third parties. For engagement advertisements and offers, mobile advertisements, and other advertisements, delivery occurs when the advertisement has been displayed or the offer has been completed by the customer, as evidenced by third party verification reports supporting the number of advertisements displayed or offers completed.
	We report our advertising revenue net of amounts retained by advertising networks, agencies, and brokers because we are not the primary obligor in our arrangements, we do not set the pricing, and we do not establish or maintain the relationship with the advertiser.
	Multiple-element Arrangements
	We allocate arrangement consideration in multiple-deliverable revenue arrangements at the inception of an arrangement to all deliverables based on the relative selling price method, generally based on our best estimate of selling price. We offer certain promotions to customers from time to time that include the sale of in-game virtual currency via the sale of a game card and also other deliverables such as a limited edition in-game virtual good.
Cost of Revenue	'
	Cost of Revenue
	Amounts recorded as cost of revenue relate to direct expenses incurred in order to generate online game revenue. Such costs are recorded as incurred. Our cost of revenue consists primarily of hosting and data center costs related to operating our games, including depreciation; consulting costs primarily related to third-party provisioning of customer support services; payment processing fees; and salaries, benefits and stock-based expense for our customer support and infrastructure teams. Cost of revenue also includes amortization expense related to purchased technology of $11.3 million, $38.5 million and $28.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash equivalents consist of cash on hand, money market funds, commercial paper, corporate bonds, municipal securities, and U.S. government-issued obligations with maturities of 90 days or less from the date of purchase.
Marketable Securities and Non-Marketable Securities	'
	Marketable Securities and Non-Marketable Securities
	Marketable securities consist of U.S. government-issued obligations, municipal securities and corporate debt securities. Management determines the appropriate classification of marketable securities at the time of purchase and evaluates such determination at each balance sheet date. The fair value of marketable securities is determined as the exit price in the principal market in which we would transact. Based on our intentions regarding our marketable securities, all marketable securities are classified as available-for-sale and are carried at fair value with unrealized gains and losses recorded as a separate component of other comprehensive income, net of income taxes. Realized gains and losses are determined using the specific-identification method and are reflected as a component of other income (expense), net in the consolidated statements of operations when they are realized. When we determine that a decline in fair value is other than temporary, the cost basis of the individual security is written down to the fair value as a new cost basis and the amount of the write-down is accounted for as a realized loss in other income (expense), net. The new cost basis will not be adjusted for subsequent recoveries in fair value. Determination of whether declines in fair value are other than temporary requires judgment regarding the amount and timing of recovery. No such impairments of marketable securities have been recorded to date.
	For non-marketable securities in which we exercise significant influence on the equity to which these non-marketable securities relate, we apply the equity method of accounting. Our non-marketable securities are subject to periodic impairment reviews.
Restricted Cash	'
	Restricted Cash
	Restricted cash consists of collateral for facility operating lease agreements and funds held in escrow in accordance with the terms of certain of our business acquisition agreements.
Derivatives and Hedging	'
	Derivatives and Hedging
	We account for derivative financial instruments in accordance with Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging, which requires that every derivative instrument be recorded on the balance sheet as either an asset or liability measured at its fair value as of the reporting date. ASC 815 also requires that changes in our derivatives’ fair values be recognized in earnings, unless specific hedge accounting and contemporaneous documentation criteria are met, in which case, the change in fair value related to the effective portion of the hedge may be recognized as a component of accumulated other comprehensive income (i.e., the instruments qualify for hedge accounting treatment). Any ineffective or excluded portion of a designated cash flow hedge is recognized in earnings.
Accounts Receivable and Allowance for Doubtful Accounts	'
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are recorded and carried at the original invoiced amount less an allowance for any potential uncollectible amounts. We review accounts receivable regularly and make estimates for the allowance for doubtful accounts when there is doubt as to our ability to collect individual balances. In evaluating our ability to collect outstanding receivable balances, we consider many factors, including the age of the balance, the customer’s payment history and current creditworthiness, and current economic trends. Bad debts are written off after all collection efforts have ceased. We do not require collateral from our customers.
Property and Equipment	'
	Property and Equipment
	Property and equipment are stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the estimated useful lives of the improvements or the lease term.
Business Combinations	'
	Business Combinations
	We account for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations. We allocate the purchase price of the acquisition, which includes the estimated acquisition date fair value of contingent consideration to the tangible assets, liabilities, and identifiable intangible assets acquired based on their estimated fair values. The excess of the purchase price over those fair values is recorded as goodwill. Acquisition-related expenses and restructuring costs are expensed as incurred. During the measurement period, we record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, which could be up to one year after the transaction date, subsequent adjustments are recorded to our consolidated statements of operations. We record changes in the fair value of contingent consideration liabilities within operating expenses in our consolidated statement of operations each reporting period.
Goodwill and Indefinite-Lived Intangible Assets	'
	Goodwill and Indefinite-Lived Intangible Assets
	Goodwill and indefinite-lived intangible assets are carried at cost and are evaluated annually for impairment, or more frequently if circumstances exist that indicate that impairment may exist. When conducting our annual goodwill impairment assessment, we perform a quantitative evaluation of whether goodwill is impaired using the two-step impairment test. The first step is comparing the fair value of our reporting unit to its carrying value. We consider the enterprise to be the reporting unit for this analysis. If step one indicates that impairment potentially exists, the second step is performed to measure the amount of impairment, if any. We record the amount by which the carrying value of the goodwill exceeds its implied fair value, if any, as impairment.
	We test recoverability of indefinite-lived intangible assets using a qualitative approach on whether it is more likely than not that the fair value of the intangible asset exceeds its carrying value. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset.
Other Intangible Assets	'
	Other Intangible Assets
	Other intangible assets are carried at cost less accumulated amortization. Amortization is recorded over the estimated useful lives of the assets, generally 12 to 24 months.
Impairment of Long-Lived Assets	'
	Impairment of Long-Lived Assets
	Long-lived assets, including other intangible assets (excluding indefinite-lived intangible assets), are reviewed for impairment whenever events or changes in circumstances indicate an asset’s carrying value may not be recoverable. If such circumstances are present, we assess the recoverability of the long-lived assets by comparing the carrying value to the undiscounted future cash flows associated with the related assets. If the future net undiscounted cash flows are less than the carrying value of the assets, the assets are considered impaired and an expense, equal to the amount required to reduce the carrying value of the assets to the estimated fair value, is recorded as impairment of intangible assets in the consolidated statements of operations. Significant judgment is required to estimate the amount and timing of future cash flows and the relative risk of achieving those cash flows.
	Assumptions and estimates about future values and remaining useful lives are complex and often subjective. They can be affected by a variety of factors, including external factors such as industry and economic trends, and internal factors such as changes in our business strategy and our internal forecasts. For example, if our future operating results do not meet current forecasts, we may be required to record future impairment charges for acquired intangible assets. Impairment charges could materially decrease our future net income and result in lower asset values on our balance sheet.
Stock-Based Expense	'
	Stock-Based Expense
	Prior to our initial public offering in December 2011, we granted ZSUs to our employees that generally vested upon the satisfaction of service period criteria of up to four years and a liquidity condition, the latter of which was satisfied in connection with our initial public offering. The ZSUs have a contractual term of seven years. Because the liquidity condition was not satisfied until our initial public offering, in prior periods, we had not recorded any expense associated with ZSU grants.
	For ZSUs granted prior to our initial public offering, and for awards subject to a performance condition, we recognize stock-based compensation expense using the accelerated attribution method, net of estimated forfeitures, in which compensation cost for each vesting tranche in an award is recognized ratably from the service inception date to the vesting date for that tranche. For ZSUs granted after the initial public offering, which will only be subject to a service condition, we recognize stock-based expense on a ratable basis over the requisite service period for the entire award.
	We estimate the fair value of stock options using the Black-Scholes option-pricing model. This model requires the use of the following assumptions: (i) expected volatility of our Class A common stock, which is based on our peer group in the industry in which we do business; (ii) expected life of the option award, which we elected to calculate using the simplified method; (iii) expected dividend yield, which is 0%, as we have not paid and do not anticipate paying dividends on our common stock; and (iv) the risk-free interest rate, which is based on the U.S. Treasury yield curve in effect at the time of grant with maturities equal to the grant’s expected life. Option grants have a contractual term of 10 years and generally vest over four years, with 25% vesting after one year and the remainder vesting monthly thereafter over 36 months.
	Stock-based expense is recorded net of estimated forfeitures so that expense is recorded for only those stock-based awards that we expect to vest. We estimate forfeitures based on our historical forfeiture of equity awards adjusted to reflect future changes in facts and circumstances, if any. We will revise our estimated forfeiture rate if actual forfeitures differ from our initial estimates. We record stock-based expense for stock options on a straight-line basis over the vesting term.
	For stock options issued to non-employees, including consultants, we record expense related to stock options equal to the fair value of the options calculated using the Black-Scholes model over the service performance period. The fair value of options granted to non-employees is remeasured over the vesting period and recognized as an expense over the period the services are received.
Income Taxes	'
	Income Taxes
	We account for income taxes using an asset and liability approach, which requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effects of future changes in tax laws or rates are not anticipated. If necessary, the measurement of deferred tax assets is reduced by the amount of any tax benefits that are not expected to be realized based on available evidence. We account for uncertain tax positions by reporting a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. We recognize interest and penalties, if any, related to unrecognized tax benefits in income tax expense.
Foreign Currency Transactions	'
	Foreign Currency Transactions
	Generally, the functional currency of our international subsidiaries is the U.S. dollar. For these subsidiaries, foreign currency denominated monetary assets and liabilities are remeasured into U.S. dollars at current exchange rates and foreign currency denominated nonmonetary assets and liabilities are remeasured into U.S. dollars at historical exchange rates. Gains or losses from foreign currency remeasurement are included in other income (expense), net in the consolidated statements of operations. For foreign subsidiaries where the functional currency is the local currency, we use the period-end exchange rates to translate assets and liabilities, and the average exchange rates to translate revenues and expenses into U.S. dollars. We record translation gains and losses in accumulated other comprehensive income (loss) as a component of stockholders’ equity.
Concentration of Credit Risk and Significant Customers	'
	Concentration of Credit Risk and Significant Customers
	Financial instruments, which potentially expose us to concentrations of credit risk, consist primarily of cash and cash equivalents, short-term and long-term marketable securities, and accounts receivable. Substantially all of our cash, cash equivalents and short-term marketable securities are maintained with three financial institutions with high credit standings. We perform periodic evaluations of the relative credit standing of these institutions.
	Accounts receivable are unsecured and represent amounts due to us based on contractual obligations where a signed and executed contract or click-through agreement exists. In cases where we are aware of circumstances that may impair a specific customer’s ability to meet its financial obligations, we record a specific allowance as a reduction to the accounts receivable balance to reduce it to its net realizable value.
	Facebook is a significant distribution, marketing, promotion and payment platform for our social games. A significant portion of our 2013, 2012 and 2011 revenue was generated from players who accessed our games through Facebook. As of December 31, 2013 and December 31, 2012, 41% and 58% of our accounts receivable, respectively, were amounts owed to us by Facebook.
Advertising Expense	'
	Advertising Expense
	Costs for advertising are expensed as incurred. Advertising costs, which are included in sales and marketing expense, primarily consisting of player acquisition costs, totaled $60.6 million, $102.2 million and $102.6 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In June 2013, the Financial Accounting Standards Board ratified Emerging Issues Task Force (“EITF”) Issue 13-C, “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 will adopt this amendment in the first quarter of 2014. We do not expect our adoption of this standard to have a material impact on our financial statements.
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. 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.
Fair Value of Financial Instruments	'
	Our financial instruments consist of cash equivalents, short-term and long-term marketable securities, accounts receivable, long-term debt and, at December 31, 2012, an interest rate swap. Accounts receivable, net and long-term debt are stated at their 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. Interest rate swaps are estimated using expected cash flows related to our interest rate swap agreement, appropriately discounted considering the uncertainties associated with the terms of the loan agreement and interest rate swap agreement.
	We determined the fair value of our interest rate swap as of December 31, 2012 by calculating the net present value of the fixed and variable future cash flows of the swap agreement, which was based on the swap’s stated rate and current market interest rates, respectively.
	Contingent consideration represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisition of Spooky Cool Labs LLC that is contingent upon the achievement of certain performance milestones. 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 fourth quarter of 2013, we updated this analysis and recorded the change in estimated fair value of the contingent consideration liability as an expense of approximately $0.9 million within total costs and expenses in our consolidated statement of income. The significant unobservable inputs used in the fair value measurement of the acquisition-related contingent consideration payable are forecasted future cash flows, the timing of those cash flows, and the probability assumptions associated with such cash flows. Significant changes in actual and forecasted future cash flows may result in significant charges or benefits to our future operating expenses.

Cash_and_Investments_Tables

Cash and Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Cash And Cash Equivalents [Abstract]	'
Schedule of Cash and Investments	'
	Cash and investments consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Cash and cash equivalents:
	Cash	$	116,102	$	137,104
	Money market funds		349,421		226,993
	Corporate debt securities		—		21,852
	Total cash and cash equivalents	$	465,523	$	385,949
	Marketable securities:
	U.S. government and government agency debt securities	$	333,741	$	464,815
	Corporate debt securities		731,324		796,316
	Municipal securities		11,382		5,233
	Total	$	1,076,447	$	1,266,364
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):
		December 31, 2013
		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
		31-Dec-12
		Amortized		Gross			Gross			Aggregate
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	U.S. government and government agency debt securities	$	464,517	$	303		$	(5	)	$	464,815
	Corporate debt securities		795,962		524			(170	)		796,316
	Municipal securities		5,234		—			(1	)		5,233
	Total	$	1,265,713	$	827		$	(176	)	$	1,266,364
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):
		December 31,		December 31,
		2013		2012
	Due within one year	$	659,973	$	898,821
	After one year through three years		416,474		367,543
	Total	$	1,076,447	$	1,266,364
Schedule of Unrealized Losses on Marketable Securities	'
	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. None of these securities were in a continuous unrealized loss position for more than 12 months.
		December 31, 2013					December 31, 2012
		Fair Value		Unrealized loss			Fair Value			Unrealized loss
	U.S. government and government agency debt securities	$	98,787	$	(51	)	$	43,404		$	(5	)
	Corporate debt securities		142,071		(257	)		371,243			(170	)
	Municipal securities		—		—			3,063			(1	)
	Total	$	240,858	$	(308	)	$	417,710		$	(176	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Assets Measured on Recurring Basis	'
	The composition of our financial instruments and our impaired intangible assets among the three Levels of the fair value hierarchy are as follows (in thousands):
			December 31, 2013
			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	$	—
	-1	Includes amounts classified as cash and equivalents
			31-Dec-12
			Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds(1)		$	226,993	$	—	$	—	$	226,993
	U.S. government and government agency debt securities			—		464,815		—		464,815
	Corporate debt securities(1)			—		818,167		—		818,167
	Municipal securities			—		5,234		—		5,234
	Total		$	226,993	$	1,288,216	$	—	$	1,515,209
	Liabilities
	Interest rate swap agreements		$	—	$	2,423	$	—	$	2,423
	-1	Includes amounts classified as cash and cash equivalents.

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Components of Property and Equipment	'
	Property and equipment consist of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Computer equipment	$	225,063		$	294,208
	Software		27,668			28,594
	Land		89,130			89,130
	Building		192,512			190,931
	Furniture and fixtures		11,303			13,959
	Leasehold improvements		11,695			20,383
			557,371			637,205
	Less accumulated depreciation		(208,578	)		(171,131	)
	Total property and equipment, net	$	348,793		$	466,074
Summary of Purchase Consideration	'
	The purchase consideration for the corporate headquarters building was as follows (in thousands):
	Cash	$	233,700
	Gain on termination of below-market lease		41,058
	Total purchase consideration	$	274,758
Summary of Fair Values of Net Tangible and Intangible Assets Acquired	'
	The following table summarizes the fair values of net tangible and intangible assets acquired (in thousands):
	Building	$	182,644
	Land		89,130
	Acquired lease intangibles		2,984
	Total	$	274,758

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Schedule of Purchase Price Allocation	'
	The following table summarizes the purchase date fair value of net tangible and intangible assets acquired from Spooky Cool Labs (in thousands, unaudited):
		Total
	Developed technology	$	7,500
	Net tangible assets acquired (liabilities assumed)		2,612
	Goodwill		20,441
	Total	$	30,553

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Changes in the carrying value of goodwill from December 31, 2011to December 31, 2013 are as follows (in thousands):
	Goodwill – December 31, 2011	$	91,765
	Additions		117,541
	Foreign currency translation adjustments		(487	)
	Goodwill adjustments		136
	Goodwill – December 31, 2012		208,955
	Additions		20,441
	Foreign currency translation adjustments		(1,407	)
	Goodwill – December 31, 2013	$	227,989
Acquisition-Related Intangible Assets	'
	The details of our acquisition-related intangible assets are as follows (in thousands):
		December 31, 2013
		Gross Carrying			Accumulated			Net Book Value
		Value			Amortization
	Developed technology	$	79,652		$	(73,402	)	$	6,250
	Trademarks, branding and domain names		15,199			(5,668	)		9,531
	Acquired lease intangibles		5,707			(3,206	)		2,501
	Total	$	100,558		$	(82,276	)	$	18,282
		31-Dec-12
		Gross Carrying			Accumulated			Net Book Value
		Value			Amortization
	Developed technology	$	81,295		$	(63,428	)	$	17,867
	Trademarks, branding and domain names		15,519			(4,012	)		11,507
	Acquired lease intangibles		5,707			(1,418	)		4,289
	Total	$	102,521		$	(68,858	)	$	33,663
Schedule of Finite Lived Intangible Assets Future Amortization Expense	'
	As of December 31, 2013, future amortization expense related to the intangible assets is expected to be recognized as shown below (in thousands):
	Year ending December 31:
	2014	$	5,264
	2015		4,181
	2016		2,139
	2017 and thereafter		578
	Total	$	12,162

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign	'
	Income (loss) before income tax expense consists of the following for the periods shown below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	United States	$	(56,215	)	$	(41,963	)	$	(379,800	)
	International		(8,654	)		(117,612	)		(26,342	)
	Total	$	(64,869	)	$	(159,575	)	$	(406,142	)
Components of Income Tax Expense (Benefit)	'
	Income tax expense (benefit) consists of the following for the periods shown below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Current:
	Federal	$	(12,222	)	$	84,421		$	(8,988	)
	State		(105	)		5,431			1,195
	Foreign		3,206			3,862			1,600
	Total current tax expense		(9,121	)		93,714			(6,193	)
	Deferred:
	Federal		(17,847	)		(40,331	)		4,687
	State		(115	)		(2,821	)		441
	Foreign		(804	)		(689	)		(761	)
	Total deferred tax expense (benefit)		(18,766	)		(43,841	)		4,367
	Provision for (benefit from) income taxes	$	(27,887	)	$	49,873		$	(1,826	)
Schedule of Effective Income Tax Reconciliation	'
	The reconciliation of federal statutory income tax provision (benefit) to our effective income tax provision is as follows (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Expected provision (benefit) at U.S. federal statutory rate	$	(22,704	)	$	(55,837	)	$	(142,166	)
	State income taxes—net of federal benefit		(15,947	)		(370	)		(6,340	)
	Income taxed at foreign rates		4,024			48,427			6,338
	Stock-based compensation		6,741			29,998			43,064
	Tax credits		(39,593	)		(8,026	)		(34,769	)
	Tax reserve for uncertain tax positions		30,224			48,252			29,303
	Change in valuation allowance		28,354			(8,005	)		101,489
	Change in earnings mix		(16,306	)		—			—
	Impact of change in tax rates		(1,530	)		(566	)		(205	)
	Acquisition costs		(1,480	)		(4,960	)		397
	Other		330			960			1,063
		$	(27,887	)	$	49,873		$	(1,826	)
Schedule of Deferred Tax Assets and Liabilities	'
	Deferred tax assets and liabilities consist of the following (in thousands):
		Year Ended December 31,
		2013			2012
	Deferred tax assets:
	Tax credit carryforwards	$	60,745		$	27,502
	Equity based compensation		28,164			68,644
	Net operating loss carryforwards		14,892			12,810
	Acquired intangible assets		7,183			—
	Accrued expenses		6,856			2,764
	Deferred revenue		5,984			16,200
	Charitable contributions		5,130			4,836
	Deferred rent		4,620			6,014
	State taxes		2,725			2,765
	Other		679			1,926
	Other accrued compensation		190			5,031
	Valuation allowance		(92,095	)		(90,382	)
	Net deferred tax assets		45,073			58,110
	Deferred tax liabilities:
	Depreciation		(21,356	)		(52,252	)
	Prepaid expenses		—			(320	)
	Net deferred tax liabilities		(21,356	)		(52,572	)
	Net deferred taxes	$	23,717		$	5,538
		Year Ended December 31,
		2013			2012
	Recorded as:
	Current deferred tax assets	$	16,293		$	30,122
	Non-current deferred tax assets		7,424			—
	Non-current deferred tax liabilities		—			(24,584	)
	Net deferred tax assets	$	23,717		$	5,538
Summary of Net Operating Loss and Tax Credit Carryforwards	'
	Net operating loss and tax credit carryforwards as of December 31, 2013 are as follows (in thousands):
		Amount			Expiration years
	Net operating losses, federal	$	283,150			2029 - 2033
	Net operating losses, state	$	203,175			2022 - 2033
	Tax credit, federal	$	73,560			2021 - 2023
	Tax credits, state	$	43,662			2018 - indefinite
	Net operating losses, foreign	$	—			2018 - 2020
	Tax credits, foreign	$	—			2018 - 2019
Summary of Income Tax Contingencies	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
	December 31, 2010	$	15,183
	Additions based on tax positions related to 2011		30,841
	Additions for tax positions of prior years		2,318
	Reductions for tax positions of prior years		(9	)
	December 31, 2011		48,334
	Additions based on tax positions related to 2012		51,222
	Reductions for tax positions of prior years		(835	)
	December 31, 2012		98,721
	Additions based on tax positions related to 2013		16,414
	Additions for tax positions of prior years		18,356
	December 31, 2013	$	133,491

Other_Current_Liabilities_Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]	'
Schedule of Other Current Liabilities	'
	Other current liabilities consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Customer deposits	$	5,809	$	25,671
	Accrued escrow for acquisitions		6,122		32,568
	Other		56,935		88,644
	Total other current liabilities	$	68,866	$	146,883

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Weighted-Average Grant Date Fair Value of Stock Options and Related Assumptions	'
	The following table presents the weighted-average grant date fair value of stock options and the related assumptions used to estimate the fair value in our consolidated financial statements:
		Year Ended December 31,
		2013			2012			2011
	Expected term, in years		7			6			6
	Risk-free interest rates		2.05			0.67	%		2.04	%
	Expected volatility		49	%		62	%		64	%
	Dividend yield		—			—			—
	Weighted-average estimated fair value of options granted during the year	$	1.82		$	1.58		$	4.17
Stock-Based Expense Related to Grants of Employee and Consultant Stock Options, Warrants, Restricted Stock and ZSUs	'
	We recorded stock-based expense related to grants of employee and consultant stock options, warrants, restricted stock and (ZSUs) in our consolidated statements of operations as follows (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Cost of revenue	$	468		$	12,116		$	17,660
	Research and development		61,931			200,640			374,920
	Sales and marketing		8,079			24,684			81,326
	General and administrative		13,915			44,546			126,306
	Total stock-based expense	$	84,393		$	281,986		$	600,212
Schedule of Share Based Compensation Stock Options Activity	'
	The following table shows stock option activity for the year ended December 31, 2013 (in thousands, except weighted-average exercise price and remaining 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, 2012		80,819		$	1.52		$	100,225			7.43
	Granted		7,557			3.56
	Forfeited and cancelled		(16,962	)		2.75
	Exercised		(30,333	)		0.6
	Balance as of December 31, 2013		41,081		$	2.07		$	83,089			7.02
	As of December 31, 2013
	Exercisable options		23,125		$	0.88		$	67,443			5.79
	Vested and expected to vest		35,591		$	1.55		$	80,036			6.8
Schedule of Share Based Compensation Restricted Stock Units Award Activity	'
	The following table shows a summary of ZSU activity for the year ended December 31, 2013 (in thousands, except weighted-average fair value and remaining term):
		Outstanding ZSUs
		Shares			Weighted-			Aggregate
					Average			Intrinsic Value of
					Grant Date			Unvested ZSUs
					Fair Value
	Unvested as of December 31, 2012		56,648		$	9.56		$	133,690
	Granted		76,602			3.33
	Vested		(23,339	)		8.62
	Forfeited and cancelled		(42,914	)		6.14
	Unvested as of December 31, 2013		66,997		$	4.96		$	254,589
Common Stock Reserved for Future Issuance	'
	As of December 31, 2013, we had reserved shares of common stock for future issuance as follows (in thousands):
		December 31, 2013
	Stock options outstanding		41,081
	ZSUs outstanding		66,997
	Equity Incentive Plan		68,710
	2011 Employee Stock Purchase Plan		33,697
			210,485
Accumulated Other Comprehensive Income	'
	The components of accumulated other comprehensive income, net of taxes, were as follows (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Unrealized gains (losses) on available-for-sale securities	$	213		$	649		$	(91	)
	Unrealized gains (losses) on derivative investments		—			(2,423	)		—
	Foreign currency translation		(1,259	)		327			453
	Total	$	(1,046	)	$	(1,447	)	$	362

Net_Income_Loss_Per_Share_of_C1

Net Income (Loss) Per Share of Common Stock (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		Year Ended December 31,
		2013									2012									2011
		Class A			Class B			Class C			Class A			Class B			Class C			Class A			Class B			Class C
	BASIC:
	Net income (loss) attributable to common stockholders	$	(29,082	)	$	(6,951	)	$	(949	)	$	(109,643	)	$	(94,007	)	$	(5,798	)	$	(8,522	)	$	(367,051	)	$	(28,743	)
	Weighted-average common shares outstanding		628,947			150,330			20,517			387,995			332,665			20,517			6,083			261,999			20,517
	Basic net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.28	)	$	(0.28	)	$	(0.28	)	$	(1.40	)	$	(1.40	)	$	(1.40	)
	DILUTED:
	Net income (loss) attributable to common stockholders-basic	$	(29,082	)	$	(6,951	)	$	(949	)	$	(109,643	)	$	(94,007	)	$	(5,798	)	$	(8,522	)	$	(367,051	)	$	(28,743	)
	Reallocation of net income (loss) as a result of conversion of Class C shares to Class B and Class A shares		(949	)		—			—			(5,798	)		—			—			(28,743	)		—			—
	Reallocation of net income (loss) as a result of conversion of Class B shares to Class A shares		(6,951	)		—			—			(94,007	)		—			—			(367,051	)		—			—
	Net income (loss) attributable to common stockholders-diluted	$	(36,982	)	$	(6,951	)	$	(949	)	$	(209,448	)	$	(94,007	)	$	(5,798	)	$	(404,316	)	$	(367,051	)	$	(28,743	)
	Weighted -average common shares outstanding-basic		628,947			150,330			20,517			387,995			332,665			20,517			6,083			261,999			20,517
	Conversion of Class C to Class A common shares outstanding		20,517			—			—			20,517			—			—			—			—			—
	Conversion of Class C to Class B common shares outstanding		—			—			—			—			—			—			20,517			—			—
	Conversion of Class B to Class A common shares outstanding		150,330			—			—			332,665			—			—			261,999			—			—
	Weighted -average common shares outstanding-diluted		799,794			150,330			20,517			741,177			332,665			20,517			288,599			261,999			20,517
	Diluted net income (loss) per share	$	(0.05	)	$	(0.05	)	$	(0.05	)	$	(0.28	)	$	(0.28	)	$	(0.28	)	$	(1.40	)	$	(1.40	)	$	(1.40	)
Weighted Average Employee Equity Awards	'
	The following weighted-average employee 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):
		Year Ended December 31,
		2013			2012			2011
	Stock options		61,154			86,054			103,565
	Warrants		579			695			17,215
	Restricted shares		4,203			14,185			—
	ZSUs		63,794			71,290			47,392
	Total		129,730			172,224			168,172

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Lease Payments for Operating Leases	'
	As of December 31, 2013, future minimum lease payments related to these leases are as follows (in thousands):
	Year ending December 31:
	2014	$	31,215
	2015		28,359
	2016		22,428
	2017		13,286
	2018 and thereafter		45,814
		$	141,102
Schedule of Future Minimum Purchase Commitments	'
	Future minimum purchase commitments that have initial or remaining non-cancelable terms as of December 31, 2013, are as follows (in thousands):
	Year ending December 31:
	2014	$	4,723
	2015		826
	2016		407
		$	5,956

Geographical_Information_Table

Geographical Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Revenue by Geographical Area	'
	The following represents our revenue based on the geographic location of our players (in thousands):
	Revenue		Year Ended December 31,
			2013		2012		2011
	United States		$	519,819	$	757,299	$	734,469
	All other countries(1)			353,447		523,968		405,631
	Total revenue		$	873,266	$	1,281,267	$	1,140,100
	-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		Year Ended December 31,
			2013		2012		2011
	United States		$	345,598	$	459,906	$	252,552
	All other countries			3,195		6,168		4,188
	Total property and equipment, net		$	348,793	$	466,074	$	256,740

Overview_and_Summary_of_Signif2

Overview and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Dec. 15, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
		Business
		Segment
		Financial_Institution
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Initial offering period	'	'December 2011	'	'
Stock issued during period, shares, new issues	100,000,000	'	'	'
Share price	$10	'	'	'
Proceeds from issuance initial public offering	$961,400,000	'	'	$961,403,000
Underwriters expenses	32,500,000	'	'	'
Other public offering expenses	6,100,000	'	'	'
Operating segment	'	1	'	'
Number of business activities performed	'	1	'	'
Increase in revenue	'	12,300,000	'	'
Amortization of intangible assets	'	11,300,000	38,500,000	28,400,000
Cash equivalents maturity period	'	'90 days	'	'
Impairments of marketable securities	'	0	'	'
Minimum service period required for employees to vest granted shares	'	'4 years	'	'
Expected dividend yield	'	0.00%	'	'
Option grants vesting period	'	'4 years	'	'
Option grants vesting percentage	'	25.00%	'	'
Period over which stock options vest on monthly basis	'	'36 months	'	'
Number of financial institutions in which cash, cash equivalents and securities held	'	3	'	'
Advertising expense	'	$60,600,000	$102,200,000	$102,600,000
Minimum [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Estimated useful lives of intangible assets	'	'12 months	'	'
Maximum [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Estimated useful lives of intangible assets	'	'24 months	'	'
Facebook Credits [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Face value per in-game credit	'	0.1	'	'
Revenue recognized per in-game credit	'	0.07	'	'
Percentage of revenue recognized price	'	70.00%	'	'
Facebook [Member] | Customer concentration risk [Member] | Accounts receivable [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Entity wide accounts receivables major customer percentage	'	41.00%	58.00%	'
Stock options [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Contractual term	'	'10 years	'	'
ZSUs [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Contractual term of ZSU's	'	'7 years	'	'
Convertible Preferred Stock Covert To Class B Common Stock [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Conversion of stock, shares converted	304,900,000	'	'	'
Restricted Stock Units (ZSUs) Convert To Class B Common Stock [Member]	'	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'	'
Conversion of stock, shares converted	15,700,000	'	'	'

Cash_and_Investments_Schedule_

Cash and Investments - Schedule of Cash and Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	$465,523	$385,949	$1,582,343	$187,831
Marketable securities	1,076,447	1,266,364	'	'
Cash [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	116,102	137,104	'	'
Money market funds [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	349,421	226,993	'	'
Corporate debt securities [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	'	21,852	'	'
Marketable securities	731,324	796,316	'	'
U.S. government and government agency debt securities [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Marketable securities	333,741	464,815	'	'
Municipal securities [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Marketable securities	$11,382	$5,233	'	'

Cash_and_Investments_Summary_o

Cash and Investments - Summary of Available-for-Sale Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$1,076,233	$1,265,713
Gross Unrealized Gains	522	827
Gross Unrealized Losses	-308	-176
Aggregate Fair Value	1,076,447	1,266,364
U.S. government and government agency debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	333,632	464,517
Gross Unrealized Gains	160	303
Gross Unrealized Losses	-51	-5
Aggregate Fair Value	333,741	464,815
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	731,225	795,962
Gross Unrealized Gains	356	524
Gross Unrealized Losses	-257	-170
Aggregate Fair Value	731,324	796,316
Municipal securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,376	5,234
Gross Unrealized Gains	6	'
Gross Unrealized Losses	'	-1
Aggregate Fair Value	$11,382	$5,233

Cash_and_Investments_Fair_Valu

Cash and Investments - Fair Value of Available-for-Sale Marketable Securities by Contractual Maturities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Marketable Securities [Abstract]	'	'
Due within one year	$659,973	$898,821
After one year through three years	416,474	367,543
Aggregate Fair Value	$1,076,447	$1,266,364

Cash_and_Investments_Schedule_1

Cash and Investments - Schedule of Unrealized Losses on Marketable Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Line Items]	'	'
Fair Value	$240,858	$417,710
Unrealized loss	-308	-176
U.S. government and government agency debt securities [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Fair Value	98,787	43,404
Unrealized loss	-51	-5
Corporate debt securities [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Fair Value	142,071	371,243
Unrealized loss	-257	-170
Municipal securities [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Fair Value	'	3,063
Unrealized loss	'	($1)

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended		3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
			Acquired intangible assets [Member]	OMGPOP [Member]	OMGPOP [Member]	OMGPOP [Member]
				Acquired intangible assets [Member]	Acquired intangible assets [Member]	Acquired intangible assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'	'
Impairment of intangible assets	$10,217	$95,493	$10,200	$95,500	'	'
Intangible assets	18,282	33,663	0	5,300	0	4,600
Change in fair value of contingent consideration liability	$900	'	'	'	'	'

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value Assets Measured on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	$1,425,868	$1,515,209
Interest rate swap [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Liabilities Fair Value Disclosure Recurring	'	2,423
Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	349,421	226,993
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	333,741	464,815
Corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	731,324	818,167
Municipal securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	11,382	5,234
Fair value, inputs, Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	349,421	226,993
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	349,421	226,993
Fair value, inputs, Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure Recurring	1,076,447	1,288,216
Fair value, inputs, Level 2 [Member] | Interest rate swap [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Liabilities Fair Value Disclosure Recurring	'	2,423
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	333,741	464,815
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	731,324	818,167
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	11,382	5,234
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	$11,720	'

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, gross	$557,371	$637,205	'
Less accumulated depreciation	-208,578	-171,131	'
Total property and equipment, net	348,793	466,074	256,740
Computer equipment [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, gross	225,063	294,208	'
Software [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, gross	27,668	28,594	'
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	192,512	190,931	'
Furniture and fixtures [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, gross	11,303	13,959	'
Leasehold improvements [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, gross	$11,695	$20,383	'

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

Apr. 02, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Other Income (Expense) [Member]

Computer equipment and leasehold improvements [Member]

Computer equipment and leasehold improvements [Member]

Computer equipment and leasehold improvements [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Computer equipment and leasehold improvements [Member]

Computer equipment and leasehold improvements [Member]

Computer equipment and leasehold improvements [Member]

Computer equipment and leasehold improvements [Member]

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining economic life

'

'

'

'

'

'

'

'

'

'5 months

'4 months

'10 months

'11 months

Assets carrying value

'

$348,793,000

$348,793,000

$466,074,000

$256,740,000

'

$14,600,000

$27,100,000

$11,900,000

'

'

'

'

Additional depreciation expense as a result of change in estimate of property and equipment

'

4,900,000

5,300,000

'

'

'

'

'

'

'

'

'

'

Gain on sale of assets

'

'

'

'

'

1,500,000

'

'

'

'

'

'

'

Gain on write-off of deferred rent obligations

25,100,000

'

'

'

'

'

'

'

'

'

'

'

'

Loss on write-off of leasehold improvements

$46,200,000

'

'

'

'

'

'

'

'

'

'

'

'

Estimated useful life of building

'

'

'39 years

'

'

'

'

'

'

'

'

'

'

Property_and_Equipment_Summary

Property and Equipment - Summary of Purchase Consideration (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Apr. 02, 2012
Property, Plant and Equipment [Line Items]	'
Total purchase consideration	$274,758
Corporate headquarter building [Member]	'
Property, Plant and Equipment [Line Items]	'
Cash	233,700
Below market leases [Member]	'
Property, Plant and Equipment [Line Items]	'
Gain on termination of below-market lease	$41,058

Property_and_Equipment_Summary1

Property and Equipment - Summary of Fair Values of Net Tangible and Intangible Assets Acquired (Detail) (USD $)	Apr. 02, 2012
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]	'
Building	$182,644
Land	89,130
Acquired lease intangibles	2,984
Total purchase price	$274,758

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Jun. 19, 2013	Dec. 31, 2013	Mar. 21, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
	Spooky Cool Labs LLC [Member]	Spooky Cool Labs LLC [Member]	OMGPOP [Member]	OMGPOP [Member]	Other Business Acquisition [Member]	Other Business Acquisition [Member]
					Companies	Common Class A [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'
Business acquisition, cost of acquired entity	$30,553,000	'	'	'	$24,100,000	'
Business acquisition, cost of acquired entity, cash paid	19,800,000	'	183,100,000	'	23,900,000	'
Business acquisition, cost of acquired entity, fair value of contingent consideration	10,800,000	'	'	'	'	'
Business acquisition effective date of acquisition	'	19-Jun-13	'	21-Mar-12	'	'
Potential future payments maximum period	'	'2 years	'	'	'	'
Potential future payments	'	100,000,000	'	'	'	'
Business acquisition percentage of voting interests acquired	'	'	100.00%	'	'	'
Number of businesses acquired	'	'	'	'	4	'
Value of restricted shares issued	'	'	'	'	'	$200,000

Acquisitions_Schedule_of_Purch

Acquisitions - Schedule of Purchase Price Allocation (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Apr. 02, 2012	Dec. 31, 2011	Jun. 19, 2013	Jun. 19, 2013
In Thousands, unless otherwise specified					Spooky Cool Labs LLC [Member]	Spooky Cool Labs LLC [Member]
						Developed technology [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'
Acquired assets	'	'	$2,984	'	'	$7,500
Net tangible assets acquired (liabilities assumed)	'	'	274,758	'	2,612	'
Goodwill	227,989	208,955	'	91,765	20,441	'
Total	'	'	'	'	$30,553	'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Schedule of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]	'	'
Goodwill, beginning balance	$208,955	$91,765
Additions	20,441	117,541
Foreign currency translation adjustments	-1,407	-487
Goodwill adjustments	'	136
Goodwill, ending balance	$227,989	$208,955

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Acquisition-Related Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Value	$100,558	$102,521
Accumulated Amortization	-82,276	-68,858
Net Book Value	18,282	33,663
Developed technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Value	79,652	81,295
Accumulated Amortization	-73,402	-63,428
Net Book Value	6,250	17,867
Trademarks, branding and domain names [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Value	15,199	15,519
Accumulated Amortization	-5,668	-4,012
Net Book Value	9,531	11,507
Acquired lease intangibles [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Value	5,707	5,707
Accumulated Amortization	-3,206	-1,418
Net Book Value	$2,501	$4,289

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization of acquired intangible assets	$11.30	$38.50	$28.40
Developed technology [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Weighted-average remaining useful lives of acquired intangible assets	'2 years 6 months	'	'
Trademarks, branding and domain names [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Weighted-average remaining useful lives of acquired intangible assets	'2 years 2 months 12 days	'	'
Acquired lease intangibles [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Weighted-average remaining useful lives of acquired intangible assets	'3 years 9 months 18 days	'	'

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Schedule of Finite Lived Intangible Assets Future Amortization Expense (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]	'
2014	$5,264
2015	4,181
2016	2,139
2017 and thereafter	578
Total	$12,162

Income_Taxes_Schedule_of_Incom

Income Taxes - Schedule of Income before Income Tax, Domestic and Foreign (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Benefit [Line Items]	'	'	'
Income (loss) before income taxes	($64,869)	($159,575)	($406,142)
United States [Member]	'	'	'
Income Tax Benefit [Line Items]	'	'	'
Income (loss) before income taxes	-56,215	-41,963	-379,800
International [Member]	'	'	'
Income Tax Benefit [Line Items]	'	'	'
Income (loss) before income taxes	($8,654)	($117,612)	($26,342)

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax Expense (Benefit) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	($12,222)	$84,421	($8,988)
State	-105	5,431	1,195
Foreign	3,206	3,862	1,600
Total current tax expense	-9,121	93,714	-6,193
Deferred:	'	'	'
Federal	-17,847	-40,331	4,687
State	-115	-2,821	441
Foreign	-804	-689	-761
Total deferred tax expense (benefit)	-18,766	-43,841	4,367
Provision for (benefit from) income taxes	($27,887)	$49,873	($1,826)

Income_Taxes_Schedule_of_Effec

Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]	'	'	'
Expected provision (benefit) at U.S. federal statutory rate	($22,704)	($55,837)	($142,166)
State income taxes-net of federal benefit	-15,947	-370	-6,340
Income taxed at foreign rates	4,024	48,427	6,338
Stock-based compensation	6,741	29,998	43,064
Tax credits	-39,593	-8,026	-34,769
Tax reserve for uncertain tax positions	30,224	48,252	29,303
Change in valuation allowance	28,354	-8,005	101,489
Change in earnings mix	-16,306	'	'
Impact of change in tax rates	-1,530	-566	-205
Acquisition costs	-1,480	-4,960	397
Other	330	960	1,063
Provision for (benefit from) income taxes	($27,887)	$49,873	($1,826)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Effective income tax rate reconciliation, repatriation of foreign earnings	$2,400,000	'
Deferred tax assets, valuation allowance	92,095,000	90,382,000
Operating loss carryforward related to stock options	397,100,000	'
Unrecognized tax benefits that might impact effective tax rate	61,800,000	'
Liability for uncertain tax positions	500,000	100,000
Unrecognized tax benefits to be recognized within the next 12 month	$0	'

Income_Taxes_Schedule_of_Defer

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Tax credit carryforwards	$60,745	$27,502
Equity based compensation	28,164	68,644
Net operating loss carryforwards	14,892	12,810
Acquired intangible assets	7,183	'
Accrued expenses	6,856	2,764
Deferred revenue	5,984	16,200
Charitable contributions	5,130	4,836
Deferred rent	4,620	6,014
State taxes	2,725	2,765
Other	679	1,926
Other accrued compensation	190	5,031
Valuation allowance	-92,095	-90,382
Net deferred tax assets	45,073	58,110
Depreciation	-21,356	-52,252
Prepaid expenses	'	-320
Net deferred tax liabilities	-21,356	-52,572
Net deferred taxes	23,717	5,538
Current deferred tax assets	16,293	30,122
Non-current deferred tax assets	7,424	'
Non-current deferred tax liabilities	'	-24,584
Net deferred taxes	$23,717	$5,538

Income_Taxes_Summary_of_Net_Op

Income Taxes - Summary of Net Operating Loss and Tax Credit Carryforwards (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Federal [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating loss carryforwards, amount	$283,150
Tax credit carryforward, amount	73,560
Operating loss carryforwards, expiration dates	'2029 - 2033
Tax credit carryforward, expiration dates	'2021 - 2023
State [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating loss carryforwards, amount	203,175
Tax credit carryforward, amount	43,662
Operating loss carryforwards, expiration dates	'2022 - 2033
Tax credit carryforward, expiration dates	'2018 - indefinite
Foreign [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating loss carryforwards, amount	'
Tax credit carryforward, amount	'
Operating loss carryforwards, expiration dates	'2018 - 2020
Tax credit carryforward, expiration dates	'2018 - 2019

Income_Taxes_Summary_of_Income

Income Taxes - Summary of Income Tax Contingencies (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized tax benefits, beginning balance	$98,721	$48,334	$15,183
Additions based on tax positions related to current years	16,414	'	30,841
Additions for tax positions of prior years	18,356	51,222	2,318
Reductions for tax positions of prior years	'	-835	-9
Unrecognized tax benefits, ending balance	$133,491	$98,721	$48,334

Longterm_Debt_and_Derivative_F1

Long-term Debt and Derivative Financial Instruments - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
	Jun. 30, 2013	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012
Debt Instrument [Line Items]	'	'	'	'	'
Term loan	'	'	'	$100,000,000	$100,000,000
Debt instrument interest rate terms	'	'	'Three month LIBOR plus 0.75 percent	'	'
Debt instrument maturity date	'	'	30-Jun-17	'	'
Debt instrument description of variable rate basis	'	'	'0.75	'	'
Repayments of long-term debt	'	100,000,000	'	'	'
Derivative instruments, loss recognized in income	'	2,400,000	'	'	'
Line of credit facility, initiation date	'	'	31-Jul-11	'	'
Line of credit facility maximum borrowing capacity	1,000,000,000	'	'	'	'
Line of credit facility commitment fee amount	600,000	'	'	'	'
Amended Credit Facility [Member]	'	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'	'
Line of credit facility maximum borrowing capacity	200,000,000	'	'	'	'
Line of credit facility additional up-front fees	300,000	'	'	'	'
Line of credit facility frequency of commitment fee payment	'	'	'Quarterly	'	'
Line of credit facility commitment fee amount	$100,000	'	'	'	'
Line of credit facility, interest rate description	'	'	'The interest rate for the amended credit facility is determined based on a formula using certain market rates, as described in the amended credit agreement.	'	'

Other_Current_Liabilities_Sche

Other Current Liabilities - Schedule of Other Current Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]	'	'
Customer deposits current	$5,809	$25,671
Accounts payable and accrued liabilities current	6,122	32,568
Other sundry liabilities current	56,935	88,644
Other liabilities, current, total	$68,866	$146,883

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
	Employees
2012 Restructuring Plan [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Number of positions eliminated	155	'	'
Restructuring charges	'	$1.70	$7.90
Employee severance pay and related costs	'	'	7
Other non-cash charges	'	'	0.9
Stock- based expense reversals	'	0.2	6.9
Future payments remaining	'	0	'
2013 Restructuring Plans [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Number of positions eliminated	'	550	'
Restructuring charges	'	42.9	'
Employee severance pay and related costs	'	25.6	'
Non-cancelable contract costs	'	15.7	'
Other non-cash charges	'	1.6	'
Stock- based expense reversals	'	$16.60	'
Lease term expiration	'	'4 years	'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

1 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

Oct. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Nov. 30, 2011

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2011

Dec. 31, 2013

ZSUs [Member]

ZSUs [Member]

Restricted shares [Member]

Stock options [Member]

Warrant [Member]

Warrant [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class B [Member]

Common Class B [Member]

Common Class C [Member]

Voting_Rights

Common stock repurchase program [Member]

General and administrative expenses [Member]

Equity Incentive Plan [Member]

2011 ESPP [Member]

2011 ESPP [Member]

Voting_Rights

Related party [Member]

Voting_Rights

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, voting rights

'

'Voting Rights. Holders of our Class A common stock are entitled to one vote per share, holders of our Class B common stock are entitled to seven votes per share and holders of our Class C common stock are entitled to 70 votes per share. In general, holders of our Class A common stock, Class B common stock and Class C common stock will vote together as a single class on all matters submitted to a vote of stockholders, unless otherwise required by law. Delaware law could require either our Class A common stock, Class B common stock or our Class C common stock to vote separately as a single class in the following circumstances: . If we were to seek to amend our Certificate of Incorporation to increase the authorized number of shares of a class of stock, or to increase or decrease the par value of a class of stock; and . If we were to seek to amend our Certificate of Incorporation in a manner that altered or changed the powers, preferences or special rights of a class of stock in a manner that affected its holders adversely.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Voting rights per share

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

7

'

70

Conversion of stock description

'

'Conversion. Our Class A common stock is not convertible into any other shares of our capital stock. Each share of our Class B common stock and Class C common stock is convertible at any time at the option of the holder into one share of our Class A common stock. In addition, after the closing of the initial public offering, upon sale or transfer of shares of either Class B common stock or Class C common stock, whether or not for value, each such transferred share shall automatically convert into one share of Class A common stock, except for certain transfers described in our amended and restated certificate of incorporation. Our Class B common stock and Class C common stock will convert automatically into Class A common stock on the date on which the number of outstanding shares of Class B common stock and Class C common stock together represent less than 10% of the aggregate combined voting power of our capital stock. Once transferred and converted into Class A common stock, the Class B common stock and Class C common stock may not be reissued.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum percentage of common stock outstanding required for conversion

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program authorized amount

$200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for repurchase of common stock

'

9,302,000

11,756,000

283,770,000

'

'

'

'

'

'

'

9,300,000

21,100,000

'

'

'

'

'

'

'

Stock repurchase program remaining authorized repurchase amount

'

178,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program, aggregate number of shares repurchased

'

'

'

'

'

'

'

'

'

'

'

3,400,000

'

'

'

'

'

'

'

'

Treasury stock acquired, average cost per share

'

'

'

'

'

'

'

'

'

'

'

$2.74

'

'

'

'

'

'

'

'

Shares, warrant issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

Warrant exercise price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.05

'

Stock based compensation expense recognized

'

84,393,000

281,986,000

600,212,000

54,700,000

204,700,000

'

'

1,700,000

14,000,000

'

'

'

13,100,000

'

'

'

'

'

'

Shares reserved for future issuance under 2011 Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

68,700,000

'

'

'

'

'

Employee stock ownership Plan (ESOP), method of measuring compensation

'

'The number of shares of our Class A common stock reserved for future issuance under our 2011 Plan will automatically increase on January 1 of each year, beginning on January 1, 2012, and continuing through and including January 1, 2021, by 4% of the total number of shares of our capital stock outstanding as of December 31 of the preceding calendar year.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Annual increase percentage of common stock shares outstanding

'

'

'

'

'

'

'

'

'

'

'

4.00%

'

'

'

'

'

'

'

'

Total unrecognized stock based compensation expense, restricted shares

'

'

'

'

222,600,000

'

15,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average recognition period

'

'

'

'

'2 years 9 months 7 days

'

'2 years 11 days

'3 years 5 months 1 day

'

'

'

'

'

'

'

'

'

'

'

'

Shares granted as part of our executive compensation plan

'

'

'

'

17,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reversal of allocated share based compensation expense

'

'

'

'

10,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares forfeited

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares granted

'

4,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares donated

'

'

'

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

Total unrecognized stock based compensation expense, stock options

'

27,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregated intrinsic value of shares exercised

'

85,900,000

222,400,000

78,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grant date fair value of options vested

'

12,800,000

7,600,000

17,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

'

2,020,517,000

2,020,517,000

'

'

'

'

'

'

'

'

'

'

'

'

'

33,700,000

'

'

'

Common stock capital shares reserved for future issuance increases

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

Percentage of capital stock outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

'

Share-based compensation arrangement by share-based payment award, maximum employee subscription rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15.00%

'

'

'

'

Share based compensation arrangement by share based payment award employee discount rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

Employee contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000

'

'

'

Stock-based expense related to 2011 ESPP

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,300,000

'

'

'

Stockholders_Equity_WeightedAv

Stockholders' Equity - Weighted-Average Grant Date Fair Value of Stock Options and Related Assumptions (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Expected term, in years	'7 years	'6 years	'6 years
Risk-free interest rates, minimum	2.05%	0.67%	2.04%
Expected volatility, minimum	49.00%	62.00%	64.00%
Weighted-average estimated fair value of options granted during the year	$1.82	$1.58	$4.17

Stockholders_Equity_StockBased

Stockholders' Equity - Stock-Based Expense Related to Grants of Employee and Consultant Stock Options, Warrants, Restricted Stock and ZSUs (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based expense	$84,393	$281,986	$600,212
Cost of revenue [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based expense	468	12,116	17,660
Research and development [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based expense	61,931	200,640	374,920
Sales and marketing [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based expense	8,079	24,684	81,326
General and administrative [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total stock-based expense	$13,915	$44,546	$126,306

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Share Based Compensation Stock Options Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]	'	'
Options Outstanding number, Beginning balance	80,819	'
Share based compensation arrangement by share based payment award options grants in period gross	7,557	'
Share based compensation arrangement by share based payment award options forfeitures and expirations in period	-16,962	'
Stock issued during period shares stock options exercised	-30,333	'
Options Outstanding number, Ending balance	41,081	80,819
Stock Options, Exercisable options	23,125	'
Stock Options, Vested and expected to vest	35,591	'
Share based payment award options outstanding weighted average exercise price, Beginning balance	$1.52	'
Share based compensation arrangements by share based payment award options grants in period weighted average exercise price	$3.56	'
Share based compensation arrangements by share based payment award options forfeitures and expirations in period weighted average exercise price	$2.75	'
Share based compensation arrangements by share based payment award options exercises in period weighted average exercise price	$0.60	'
Share based payment award options outstanding weighted average exercise price, Ending balance	$2.07	$1.52
Weighted-Average Exercise Price, Exercisable options	$0.88	'
Weighted-Average Exercise Price, Vested and expected to vest	$1.55	'
Share based compensation arrangement by share based payment award options outstanding intrinsic value	$83,089	$100,225
Aggregate Intrinsic Value of Stock Options Outstanding, Exercisable options	67,443	'
Aggregate Intrinsic Value of Stock Options, Vested and expected to vest	$80,036	'
Share based compensation arrangement by share based payment award options outstanding weighted average remaining contractual term 2	'7 years 7 days	'7 years 5 months 5 days
Weighted-Average Contractual Term (in years), Exercisable options	'5 years 9 months 15 days	'
Weighted-Average Contractual Term (in years), Vested and expected to vest	'6 years 9 months 18 days	'

Stockholders_Equity_Schedule_o1

Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]	'
Share based payment award equity instruments other than options nonvested number, Beginning balance	56,648
Share based compensation arrangement by share based payment award equity instruments other than options grants in period	76,602
Share based compensation arrangement by share based payment award equity instruments other than options vested in period	-23,339
Share based compensation arrangement by share based payment award equity instruments other than options forfeited in period	-42,914
Share based payment award equity instruments other than options nonvested number, Ending balance	66,997
Weighted average grant date fair value, Beginning balance	$9.56
Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average grant date fair value	$3.33
Share based compensation arrangement by share based payment award equity instruments other than options vested in period weighted average grant date fair value	$8.62
Share based compensation arrangement by share based payment award equity instruments other than options forfeitures weighted average grant date fair value	$6.14
Weighted average grant date fair value, Ending balance	$4.96
Share based payment award equity instruments other than options nonvested aggregated intrinsic value, Beginning balance	$133,690
Share based payment award equity instruments other than options nonvested aggregated intrinsic value, Ending balance	$254,589

Stockholders_Equity_Common_Sto

Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)	Dec. 31, 2013
In Thousands, unless otherwise specified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation arrangement by share-based payment award, Non-option equity instruments, Outstanding, Number	210,485
Equity Incentive Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation arrangement by share-based payment award, Non-option equity instruments, Outstanding, Number	68,710
2011 Employee Stock Purchase Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation arrangement by share-based payment award, Non-option equity instruments, Outstanding, Number	33,697
Stock options [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation arrangement by share-based payment award, Non-option equity instruments, Outstanding, Number	41,081
ZSUs [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation arrangement by share-based payment award, Non-option equity instruments, Outstanding, Number	66,997

Stockholders_Equity_Accumulate

Stockholders' Equity - Accumulated Other Comprehensive Income (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Equity [Abstract]	'	'	'
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	$213	$649	($91)
Net change on unrealized gains (losses) on derivative instruments	'	-2,423	'
Change in foreign currency translation adjustment	-1,259	327	453
Accumulated other comprehensive income (loss), net of tax, total	($1,046)	($1,447)	$362

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 $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
BASIC:	'	'	'
Net income (loss) attributable to common stockholders	($36,982)	($209,448)	($404,316)
Weighted-average common shares outstanding	799,794	741,177	288,599
Basic net income (loss) per share	($0.05)	($0.28)	($1.40)
DILUTED:	'	'	'
Weighted -average common shares outstanding-basic	799,794	741,177	288,599
Weighted -average common shares outstanding-diluted	799,794	741,177	288,599
Diluted net income (loss) per share	($0.05)	($0.28)	($1.40)
Common Class A [Member]	'	'	'
BASIC:	'	'	'
Net income (loss) attributable to common stockholders	-29,082	-109,643	-8,522
Weighted-average common shares outstanding	628,947	387,995	6,083
Basic net income (loss) per share	($0.05)	($0.28)	($1.40)
DILUTED:	'	'	'
Net income (loss) attributable to common stockholders-basic	-29,082	-109,643	-8,522
Net income (loss) attributable to common stockholders-diluted	-36,982	-209,448	-404,316
Weighted -average common shares outstanding-basic	628,947	387,995	6,083
Weighted -average common shares outstanding-diluted	799,794	741,177	288,599
Diluted net income (loss) per share	($0.05)	($0.28)	($1.40)
Common Class A [Member] | Class C Convert To Class B And A [Member]	'	'	'
DILUTED:	'	'	'
Reallocation of net income (loss) as a result of common stock class conversion	-949	-5,798	-28,743
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	-6,951	-94,007	-367,051
Conversion of common stock class	150,330	332,665	261,999
Common Class A [Member] | Class C Convert To Class A [Member]	'	'	'
DILUTED:	'	'	'
Conversion of common stock class	20,517	20,517	'
Common Class A [Member] | Class C Convert To Class B [Member]	'	'	'
DILUTED:	'	'	'
Conversion of common stock class	'	'	20,517
Common Class B [Member]	'	'	'
BASIC:	'	'	'
Net income (loss) attributable to common stockholders	-6,951	-94,007	-367,051
Weighted-average common shares outstanding	150,330	332,665	261,999
Basic net income (loss) per share	($0.05)	($0.28)	($1.40)
DILUTED:	'	'	'
Net income (loss) attributable to common stockholders-basic	-6,951	-94,007	-367,051
Net income (loss) attributable to common stockholders-diluted	-6,951	-94,007	-367,051
Weighted -average common shares outstanding-basic	150,330	332,665	261,999
Weighted -average common shares outstanding-diluted	150,330	332,665	261,999
Diluted net income (loss) per share	($0.05)	($0.28)	($1.40)
Common Class C [Member]	'	'	'
BASIC:	'	'	'
Net income (loss) attributable to common stockholders	-949	-5,798	-28,743
Weighted-average common shares outstanding	20,517	20,517	20,517
Basic net income (loss) per share	($0.05)	($0.28)	($1.40)
DILUTED:	'	'	'
Net income (loss) attributable to common stockholders-basic	-949	-5,798	-28,743
Net income (loss) attributable to common stockholders-diluted	($949)	($5,798)	($28,743)
Weighted -average common shares outstanding-basic	20,517	20,517	20,517
Weighted -average common shares outstanding-diluted	20,517	20,517	20,517
Diluted net income (loss) per share	($0.05)	($0.28)	($1.40)

Net_Income_Loss_Per_Share_of_C3

Net Income (Loss) Per Share of Common Stock - Weighted Average Employee Equity Awards (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	129,730	172,224	168,172
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	61,154	86,054	103,565
Warrant [Member]	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	579	695	17,215
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	4,203	14,185	'
ZSUs [Member]	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Anti-dilutive securities excluded from computation of earnings per share amount	63,794	71,290	47,392

Commitments_and_Contingencies_1

Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leases Future Minimum Payments Due [Abstract]	'
2014	$31,215
2015	28,359
2016	22,428
2017	13,286
2018 and thereafter	45,814
Total operating leases, future minimum payments	$141,102

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail) (USD $)

12 Months Ended

0 Months Ended

11 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Nov. 19, 2012

Mar. 11, 2012

Jun. 30, 2013

Aug. 03, 2012

Aug. 16, 2012

Jul. 30, 2012

Aug. 01, 2012

Apr. 04, 2013

Feb. 10, 2012

Dec. 31, 2013

Feb. 10, 2012

Delaware [Member]

Delaware [Member]

Stockholder Derivative Lawsuits [Member]

Zynga Shareholder Derivative Litigation [Member]

Zynga Inc. Derivative Litigation [Member]

Case one [Member]

Reyes v. Zynga Inc. [Member]

Lee v. Pincus [Member]

Personalized Media Communications, LLC v. Zynga Inc. [Member]

Personalized Media Communications, LLC v. Zynga Inc. [Member]

Personalized Media Communications, LLC v. Zynga Inc. [Member]

Cases

Cases

Cases

San Francisco [Member]

Northern California [Member]

Northern California [Member]

San Francisco [Member]

Delaware [Member]

Texas [Member]

Cases

Cases

Cases

Cases

Cases

Cases

Claim

Patents

Product

Loss Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rent expense on operating leases

$7.30

$11.20

$14.40

'

'

'

'

'

'

'

'

'

'

'

Claims filed

'

'

'

'

1

8

3

4

1

1

1

'

'

1

Claims settled

'

'

'

1

'

'

'

'

'

'

'

'

'

'

Number of patents allegedly infringed on

'

'

'

'

'

'

'

'

'

'

'

'

'

4

Number of games

'

'

'

'

'

'

'

'

'

'

'

'

'

39

Petitions filed

'

'

'

'

'

'

'

'

'

'

'

'

'

4

Amount to be paid in plaintiff's settlement

'

'

'

'

'

'

'

'

'

'

'

25

'

'

Claim to be settled under the same conditions

'

'

'

'

'

'

'

'

'

'

'

$1

'

'

Payment period of damages and running royalty in contingent settlement

'

'

'

'

'

'

'

'

'

'

'

'

'Through 2027-28

'

Commitments_and_Contingencies_3

Commitments and Contingencies - Schedule of Future Minimum Purchase Commitments (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'
2014	$4,723
2015	826
2016	407
Total future minimum purchase commitments	$5,956

Geographical_Information_Reven

Geographical Information - Revenue by Geographical Area (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	$873,266	$1,281,267	$1,140,100
United States [Member]	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	519,819	757,299	734,469
All other countries [Member]	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	$353,447	$523,968	$405,631

Geographical_Information_Prope

Geographical Information - Property and Equipment, Net (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Property plant and equipment, net	$348,793	$466,074	$256,740
United States [Member]	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Property plant and equipment, net	345,598	459,906	252,552
All other countries [Member]	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Property plant and equipment, net	$3,195	$6,168	$4,188

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended	1 Months Ended
Share data in Millions, unless otherwise specified	Dec. 31, 2013	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2014	Feb. 28, 2014	Feb. 28, 2014	Feb. 28, 2014
		Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]
		Employees	Minimum [Member]	Maximum [Member]	Natural Motion Limited [Member]	Natural Motion Limited [Member]	Natural Motion Limited [Member]
						Common Class A [Member]	Common Class A [Member]
							Employees [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'
Business acquisition, cost of acquired entity, cash paid	'	'	'	'	$391,000,000	'	'
Business acquisition, cost of acquired entity, issuance of shares	'	'	'	'	'	39.8	11.6
Shares vesting period	'4 years	'	'	'	'	'3 years	'
Number of positions eliminated	'	314	'	'	'	'	'
Pre-tax restructuring expenses	'	'	$16,000,000	$18,500,000	'	'	'

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation And Qualifying Accounts [Abstract]	'	'	'
Balance at Beginning of Year	$160	$163	$325
Charged to Expenses/ Against Revenue	'	'	'
Write-Offs Net of Recoveries	-160	-3	-162
Balance at End of Year	$0	$160	$163