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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total $ 5,937 $ 5,342 $ 11,608 $ 10,235
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 4,938 4,212 9,555 8,138
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 999 $ 1,130 $ 2,053 $ 2,097