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Summary of Restricted Stock Award Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock grants vested | 832,609 | 209,821 | 250,442
Compensation expense recognized during the period | $ 15,473 | $ 10,185 | $ 9,655
Fair value of restricted shares that vested during the period | 16,870 | 8,024 | 9,501
Income tax deduction and benefit recognized upon vesting of restricted stock and restricted stock unit awards | $ 5,620 | $ 1,516 | $ 1,744
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock grants vested | 208,204 | 90,895 | 127,084
Accumulated dividends paid upon vesting of restricted stock unit awards | $ 942 | $ 386 | $ 526
Compensation expense recognized during the period | 3,931 | 4,430 | 4,681
Fair value of restricted shares that vested during the period | 5,050 | 3,658 | 4,846
Income tax deduction and benefit recognized upon vesting of restricted stock and restricted stock unit awards | $ 788 | $ 397 | $ 708

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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