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Stockholders' Equity - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |
Treasury stock, shares | 4,185,242 | 3,979,735 |
Shares purchased during period | 173,956 | 144,457 | 205,983
Treasury stock distributed under deferred compensation plan | 11,182 |  |
Stock purchased to settle employees statutory withholding taxes relates to performance stock awards and deferred compensation distribution | 42,733 |  |
Open Market Repurchases [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Shares purchased during period | 173,956 |  |

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- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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