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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue, Major Customer [Line Items]      
Customer concentrating on 10% or more of revenue 76.10% 76.70% 79.20%
Wireless [Member] | Sprint and Affiliates [Member]      
Revenue, Major Customer [Line Items]      
Customer concentrating on 10% or more of revenue 62.60% 65.40% 68.00%
Graphics [Member] | FastSpring [Member]      
Revenue, Major Customer [Line Items]      
Customer concentrating on 10% or more of revenue 13.50% 11.30% 11.20%