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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Total $ 4,709 $ 4,324 $ 9,636 $ 9,082
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 4,097 3,568 8,240 7,328
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 612 $ 756 $ 1,396 $ 1,754