Acquisitions - Additional Information (Detail) - USD ($)				3 Months Ended		12 Months Ended
	Jul. 02, 2016	Jan. 02, 2016	Sep. 11, 2015	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2016
Business Acquisition [Line Items]
Professional fees and transaction taxes						$ 300,000
Research and Development [Member]
Business Acquisition [Line Items]
Change in fair value of contingent consideration liability						$ (9,100,000)	$ 6,100,000
Zindagi [Member]
Business Acquisition [Line Items]
Business acquisition effective date of acquisition						Jan. 01, 2016
Potential future payments maximum period					3 years	3 years
Fair value of contingent consideration liability					$ 1,300,000	$ 200,000
Business acquisition, cost of acquired entity		$ 13,800,000
Business acquisition, cost of acquired entity, cash paid		$ 12,500,000
Business acquisition, prepaid compensation expense								$ 2,500,000
Potential future payments					$ 60,000,000	60,000,000
Professional fees and transaction taxes							200,000
Zindagi [Member] | Research and Development [Member]
Business Acquisition [Line Items]
Change in fair value of contingent consideration liability						$ (1,100,000)
PuzzleSocial [Member]
Business Acquisition [Line Items]
Business acquisition effective date of acquisition						Jul. 01, 2016
Potential future payments maximum period				2 years 6 months		2 years 6 months
Fair value of contingent consideration liability				$ 400,000		$ 700,000
Business acquisition, cost of acquired entity	$ 20,400,000
Business acquisition, cost of acquired entity, cash paid	$ 20,000,000
Potential future payments				$ 42,000,000		42,000,000
Percentage of acquired equity interest	100.00%
PuzzleSocial [Member] | Research and Development [Member]
Business Acquisition [Line Items]
Change in fair value of contingent consideration liability						300,000
Zindagi and PuzzleSocial [Member]
Business Acquisition [Line Items]
Professional fees and transaction taxes						$ 500,000
Rising Tide [Member]
Business Acquisition [Line Items]
Business acquisition effective date of acquisition						Sep. 11, 2015
Potential future payments maximum period						3 years
Fair value of contingent consideration liability							18,500,000
Business acquisition, cost of acquired entity			$ 44,200,000
Business acquisition, cost of acquired entity, cash paid			22,400,000
Potential future payments			140,000,000			$ 10,200,000
Professional fees and transaction taxes							$ 900,000
Business acquisition, cost of acquired entity, fair value of contingent consideration			$ 21,800,000
Amount held in escrow						5,100,000
Rising Tide [Member] | Research and Development [Member]
Business Acquisition [Line Items]
Change in fair value of contingent consideration liability						$ (8,300,000)