Acquisitions - Schedule of Acquisition Price Allocation (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Jan. 02, 2019	Dec. 31, 2018
Intangible assets, net:
Goodwill		$ 1,471,365		$ 934,187
Small Gaint [Member]
Business Acquisition [Line Items]
Cash			$ 34,193
Accounts receivables, net			22,974
Prepaid expenses			2,561
Intangible assets, net:
Goodwill			529,290
Property and equipment, net			180
Right-of-use assets			883
Other non-current assets			120
Total assets acquired			777,201
Accounts payable			(1,716)
Income tax payable			(5,623)
Operating lease liabilities			(380)
Other current liabilities			(16,126)
Deferred tax liabilities, net			(37,400)
Non-current operating lease liabilities			(503)
Total liabilities			(61,748)
Total purchase price consideration			715,453
Fair value of Zynga Stock Consideration issued	[1]		(253,903)
Non-current contingent consideration payable			(98,000)
Total cash consideration			363,550
Small Gaint [Member] | Developed Technology, Useful Life of 5 Years [Member]
Intangible assets, net:
Intangible assets, net:			155,000
Small Gaint [Member] | Trade Names, Useful Life of 7 Years [Member]
Intangible assets, net:
Intangible assets, net:			$ 32,000

[1] The fair value of the Zynga Stock Consideration above is estimated based on the total shares issued of 63,794,746 and the closing stock price of Zynga’s Common A stock on January 2, 2019 of $3.98 per share.