Debt - 5.250% Senior Unsecured Notes Due 2026 - Additional Information (Detail) - 5.250% Senior Unsecured Notes Due 2026 [Member] - USD ($)		12 Months Ended
Jul. 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 is payable on February 1 and August 1 of each year.
Senior unsecured notes, interest rate	5.25%	5.25%	5.25%
Debt instrument maturity date	Aug. 01, 2026

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

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

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