Debt - 6.375% Senior Unsecured Notes Due 2024 - Additional Information (Detail) - 6.375% Senior Unsecured Notes due 2024 [Member] - USD ($)		12 Months Ended
Feb. 22, 2016	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Senior unsecured notes face amount	$ 500,000,000
Senior unsecured notes, payable term		Interest on the notes was payable on March 1 and September 1 of each year.
Senior unsecured notes, interest rate	6.375%	6.375%	6.375%
Debt instrument maturity date	Mar. 01, 2024
Debt instrument, redemption date	Dec. 19, 2020

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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End date of debt instrument redemption period, in CCYY-MM-DD format.

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