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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, 2021 | Sep. 30, 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 | 115,712 |
Fair value of restricted shares that vested during the period | $ 2,491 | $ 8,944
Compensation expense recognized during the period | 13,757 | 8,235
Income tax benefit (cost) related to restricted stock awards | $ (105) | $ 2,678
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 | 15,230 | 120,293
Fair value of restricted shares that vested during the period | $ 314 | $ 3,669
Accumulated dividends paid upon vesting of restricted stock unit awards | 62 | 576
Compensation expense recognized during the period | 2,832 | 4,624
Income tax benefit (cost) related to restricted stock awards | $ (467) | $ 215

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