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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total $ 5,176 $ 4,927
Restricted Stock [Member]    
Allocated Share-based Compensation Expense 4,214 4,143
Stock Options [Member]    
Allocated Share-based Compensation Expense $ 962 $ 784