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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total $ 5,732 $ 6,028 $ 16,939 $ 17,636
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 4,647 4,695 14,138 14,250
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 1,085 $ 1,333 $ 2,801 $ 3,386