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, 2015	Mar. 31, 2014
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	64.70%	64.20%
Wireless [Member] | Comcast [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	10.80%
Productivity & Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	9.50%	12.60%