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Total Share-Based Compensation Expense and Related Tax Benefits Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock compensation expense $ 1,621 $ 1,562 $ 1,473
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefit related to restricted stock compensation $ 548