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Share-Based Compensation - Total Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Stock option expense $ 2,768 $ 3,331 $ 10,017 $ 10,330
Restricted stock expense 4,848 4,537 16,765 12,665
Performance restricted stock unit expense 3,812 2,957 8,239 6,883
Total pre-tax expense $ 11,428 $ 10,825 $ 35,021 $ 29,878