Acquisitions - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Jul. 02, 2016	Jan. 02, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Jan. 01, 2016
Zindagi [Member]
Business Acquisition [Line Items]
Business acquisition effective date of acquisition					Jan. 01, 2016
Potential future payments maximum period				3 years	3 years
Business acquisition, cost of acquired entity, fair value of contingent consideration		$ 1.3
Fair value of contingent consideration liability			$ 0.2		$ 0.2
Business acquisition, cost of acquired entity		13.8
Business acquisition, cost of acquired entity, cash paid		$ 12.5
Business acquisition, prepaid compensation expense						$ 2.5
Potential future payments			$ 60.0		$ 60.0
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
Business acquisition, cost of acquired entity, fair value of contingent consideration	$ 0.4
Fair value of contingent consideration liability			$ 0.4		$ 0.4
Business acquisition, cost of acquired entity	20.4
Business acquisition, cost of acquired entity, cash paid	$ 20.0
Potential future payments			$ 42.0		$ 42.0
Percentage of acquired equity interest	100.00%