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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Wireless [Member] | Sprint and affiliates [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	72.80%	67.10%	67.50%	67.30%
Productivity & Graphics [Member] | FastSpring [Member]
Revenue from External Customer [Line Items]
Customer concentrating on 10% or more of net revenue	11.20%	10.00%	10.40%	11.80%