Segment, Customer Concentration and Geographical Information - Company's Customers that Represent 10% or More of Company's Net Revenues (Detail) - Revenues [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	65.00%	64.70%
Wireless [Member] | Comcast [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	5.60%	10.80%
Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	13.60%	9.50%