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Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 12,596 $ 11,473 $ 9,967
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 952 801 884
Non-Vested Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 11,644 $ 10,672 $ 9,083