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Schedule of Information Related to Stock Repurchase Programs (Parenthetical) (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Restricted shares forfeited by former employee | 270,919 |  |
Restricted Stock Purchase Plan |  |  |
Class of Stock [Line Items] |  |  |
Restricted shares forfeited by former employee | 17,779 | 27,713 | 11,224

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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