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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

Stock repurchased during period shares related to withholding taxes of cancellation of restricted stock.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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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

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Number of shares that have been repurchased during the period and are being held in treasury.

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