Commitments and Contingencies - Additional Information (Detail)										3 Months Ended	12 Months Ended
	Dec. 22, 2017 USD ($)	May 01, 2017 USD ($)	Mar. 31, 2017 USD ($) Case	Nov. 02, 2016 USD ($)	Apr. 04, 2014 Case	Mar. 11, 2013 Case	Nov. 19, 2012 Case	Aug. 16, 2012 Case	Aug. 03, 2012 Case	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Uncertain income tax position liability											$ 9,000,000
Delaware [Member]
Loss Contingencies [Line Items]
Claims filed | Case						1
Claims settled | Case							1
Stockholder Derivative Lawsuits [Member]
Loss Contingencies [Line Items]
Claims filed | Case									8
Zynga Shareholder Derivative Litigation [Member] | San Francisco [Member]
Loss Contingencies [Line Items]
Claims filed | Case									3
Zynga Inc. Derivative Litigation [Member] | Northern California [Member]
Loss Contingencies [Line Items]
Claims filed | Case								4
Sandys v. Pincus [Member] | Delaware [Member]
Loss Contingencies [Line Items]
Claims filed | Case					1
Mayer et al. v. Zynga [Member]
Loss Contingencies [Line Items]
Payment for legal settlement	$ 11,900,000
Claims filed | Case			5
Compensatory damages held in escrow	$ 1,100,000		$ 875,000
Loss contingencies for counter claims		$ 2,500,000
Final settlement agreement, executed date			December 22, 2017
Mayer et al. v. Zynga [Member] | Other Current Liabilities [Member]
Loss Contingencies [Line Items]
Settlement payable obligation											$ 11,900,000
Mayer et al. v. Zynga [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Entitled to compensatory damages			$ 60,000,000
Revolving Line of Credit [Member]
Loss Contingencies [Line Items]
Line of credit facility maximum borrowing capacity				$ 200,000,000
Line of credit facility commitment fee amount				$ 100,000
Line of credit facility, termination date											Nov. 02, 2016
Scenario Forecast [Member]
Loss Contingencies [Line Items]
Payment for legal settlement										$ 11,900,000