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Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of restricted stock unit awards that vested during the period | 330 |
Fair value of restricted shares that vested during the period | $ 5.6 | $ 1.2
Compensation expense recognized during the period | 4.2 | 4.2
Income tax benefit (cost) related to restricted stock awards | $ 0.8 | $ (0.1)
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 | 100 | 10
Fair value of restricted shares that vested during the period | $ 1.7 | $ 0.3
Accumulated dividends paid upon vesting of restricted stock unit awards | 0.3 | 0.1
Compensation expense recognized during the period | 0.9 | 0.5
Income tax benefit (cost) related to restricted stock awards | $ 0.3 | $ (0.1)

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