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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Total $ 4,324 $ 4,852 $ 9,082 $ 9,776
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 3,568 3,728 7,328 7,513
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 756 $ 1,124 $ 1,754 $ 2,263