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Stock-based Compensation and Other Employee Benefits - Schedule of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation $ 45,281 $ 26,532 $ 31,826
Income tax benefit (6,465) (8,188) (10,342)
Stock-based compensation expense, net of tax 38,816 18,344 21,484
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation 39,180 21,887 28,952
ESPP purchase rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation 6,101 4,645 2,795
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense (benefit) $ 0 $ 0 $ 79