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Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Labor And Related Expense [Abstract]    
Stock-based compensation expense $ 174 $ 306
Tax benefit 44 78
Stock-based compensation expense, net of tax $ 130 $ 228