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Stock-based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 4,648 $ 8,553 $ 22,541 $ 26,942
Income tax benefit (1,525) (3,649) (6,929) (7,895)
Stock-based compensation expense, net of tax 3,123 4,904 15,612 19,047
RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 3,545 7,979 18,875 24,931
ESPP Purchase Rights [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,103 $ 574 $ 3,666 1,932
Employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit)       $ 79