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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Total $ 5,597 $ 4,709 $ 10,773 $ 9,636
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 4,424 4,097 8,638 8,240
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 1,173 $ 612 $ 2,135 $ 1,396