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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Total | $ 22,639 | $ 23,170 | $ 21,076
Restricted Stock [Member] |  |  |
Allocated Share-based Compensation Expense | 18,740 | 19,143 | 16,720
Stock Options [Member] |  |  |
Allocated Share-based Compensation Expense | $ 3,899 | $ 4,027 | $ 4,356

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