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Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Labor And Related Expense [Abstract]    
Stock-based compensation expense $ 451 $ 464
Tax benefit 174 180
Stock-based compensation expense, net of tax $ 277 $ 284