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, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	77.50%	61.20%	54.90%
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	53.10%	40.70%	24.80%
Wireless [Member] | Verizon Wireless and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	13.00%	20.50%	18.40%
Wireless [Member] | AT&T [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue			11.70%
Productivity & Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	11.40%