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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total | $ 5,480 | $ 5,521 | $ 11,019 | $ 11,207
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 1,862,375 |  | 1,862,375 |
Restricted Stock [Member] |  |  |  |
Allocated Share-based Compensation Expense | $ 4,436 | 4,627 | $ 8,945 | 9,491
Stock Options [Member] |  |  |  |
Allocated Share-based Compensation Expense | $ 1,044 | $ 894 | $ 2,074 | $ 1,716

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