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Long-Term Debt (5.500% Senior Notes due 2028) - Additional Information (Detail) - 5.500% Senior Notes due 2028 [Member] - USD ($)	Jun. 24, 2020	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Issued Senior Notes	$ 450,000,000.0
Debt instrument interest rate	5.50%	5.50%	5.50%
Debt instrument maturity date	Jul. 01, 2028
Interest on the notes	payable semi-annually in arrears on January 1 and July 1 of each year, commencing on January 1, 2021

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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