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Share-Based Compensation - Total Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]        
Stock option expense $ 3,326 $ 3,626 $ 7,249 $ 6,999
Restricted stock expense 5,690 4,586 11,917 8,128
Performance restricted stock unit expense 3,137 2,993 4,427 3,926
Total pre-tax expense $ 12,153 $ 11,205 $ 23,593 $ 19,053