Segment, Customer Concentration and Geographical Information - Company's Customers that Represent 10% or More of Company's Revenues (Detail) - Revenues [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	76.70%	79.20%	77.50%
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	65.40%	68.00%	53.10%
Wireless [Member] | Verizon Wireless and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	4.20%	7.80%	13.00%
Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	11.30%	11.20%	11.40%