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Summary of Restricted Stock Award Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of restricted stock unit awards that vested during the period | 209,821 | 250,442 | 192,230
Compensation expense recognized during the period | $ 10,185 | $ 9,655 | $ 8,384
Fair value of restricted shares that vested during the period | 8,024 | 9,501 | 8,172
Income tax deduction and benefit recognized upon vesting of restricted stock and restricted stock unit awards | $ 1,516 | $ 1,744 | $ 2,667
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 | 90,895 | 127,084 | 97,115
Accumulated dividends paid upon vesting of restricted stock unit awards | $ 386 | $ 526 | $ 558
Compensation expense recognized during the period | 4,430 | 4,681 | 4,297
Fair value of restricted shares that vested during the period | 3,658 | 4,846 | 4,155
Income tax deduction and benefit recognized upon vesting of restricted stock and restricted stock unit awards | $ 397 | $ 708 | $ 1,745

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