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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