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Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of restricted stock unit awards that vested during the period | 55,064 |
Fair value of restricted shares that vested during the period | $ 1,148 | $ 8,029
Compensation expense recognized during the period | 4,230 | 2,691
Income tax benefit (cost) related to restricted stock awards | $ (110) | $ 2,418
Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of restricted stock unit awards that vested during the period | 14,744 | 112,070
Fair value of restricted shares that vested during the period | $ 303 | $ 3,554
Accumulated dividends paid upon vesting of restricted stock unit awards | 63 | 544
Compensation expense recognized during the period | 438 | 1,420
Income tax benefit (cost) related to restricted stock awards | $ (129) | $ 821

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