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])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	79.20%	77.50%	61.20%
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	68.00%	53.10%	40.70%
Wireless [Member] | Verizon Wireless and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	7.80%	13.00%	20.50%
Productivity & Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	11.20%	11.40%