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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense $ 6,366 $ 6,207 $ 16,792 $ 14,989
Cost of Revenues [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total pre-tax stock-based compensation expense 1,489 1,187 2,494 2,117
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 819 827 1,541 1,572
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 $ 4,058 $ 4,193 $ 12,757 $ 11,300