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Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense $ 5,158 $ 3,247 $ 19,826 $ 10,025
Cost of Revenues [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense 666 432 1,996 1,489
Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense 551 405 1,614 1,255
Selling, General and Administrative Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense $ 3,941 $ 2,410 $ 16,216 $ 7,281