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Stock-Based Compensation (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Total $ 5,105 $ 4,907 $ 15,340 $ 15,680
Restricted Stock [Member]        
Allocated Share-based Compensation Expense 3,937 3,902 12,075 12,540
Stock Options [Member]        
Allocated Share-based Compensation Expense $ 1,168 $ 1,005 $ 3,265 $ 3,140