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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total $ 4,893 $ 5,176
Restricted Stock [Member]    
Allocated Share-based Compensation Expense 3,926 4,214
Stock Options [Member]    
Allocated Share-based Compensation Expense $ 967 $ 962