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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total $ 19,509 $ 18,698 $ 19,260
Restricted Stock [Member]      
Allocated Share-based Compensation Expense 16,494 15,543 15,007
Stock Options [Member]      
Allocated Share-based Compensation Expense $ 3,015 $ 3,155 $ 4,253