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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred tax benefits recognized $ 353 $ 282 $ 956 $ 772
Tax benefits realized for restricted stock and paid dividends 47 $ 1 1,286 986
Fair value of vested restricted stock $ 26   $ 5,625 $ 4,331