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Stock-Based Compensation - Information about Deferred Tax Benefits Recognized Related to Restricted Stock Awards, Paid Dividends and the Fair Value of Vested Restricted Stock (Detail) - Restricted Stock [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred tax benefits recognized $ 434 $ 485 $ 1,185 $ 1,561
Tax benefits realized for restricted stock and paid dividends 45 28 176 527
Fair value of vested restricted stock $ 75 $ 75 $ 1,993 $ 1,798