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Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of restricted stock unit awards that vested during the period | 326,281 |
Fair value of restricted shares that vested during the period | $ 8,944 | $ 7,630
Compensation expense recognized during the period | 8,235 | 7,456
Income tax benefit recognized upon vesting of restricted stock awards | $ 2,678 | $ 1,473
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 | 120,293 | 88,074
Fair value of restricted shares that vested during the period | $ 3,669 | $ 3,550
Accumulated dividends paid upon vesting of restricted stock unit awards | 576 | 375
Compensation expense recognized during the period | 4,624 | 3,030
Income tax benefit recognized upon vesting of restricted stock awards | $ 215 | $ 175

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