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Stock-based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 7,613 $ 7,105 $ 17,893 $ 18,390
Income tax benefit (2,531) (1,563) (5,404) (4,246)
Stock-based compensation expense, net of tax 5,082 5,542 12,489 14,144
RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 6,093 6,389 15,330 17,077
ESPP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,520 591 $ 2,563 1,358
Employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit)   $ 125   $ (45)