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Long-Term Debt (5.000% Senior Notes due 2029) - Additional Information (Detail) - USD ($)		12 Months Ended
	Oct. 14, 2020	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Debt Instrument [Line Items]
Debt extinguishment costs		$ (7,233,000)	$ (1,815,000)
5.000% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Issued Senior Notes	$ 475,000,000.0
Debt instrument interest rate	5.00%	5.00%		5.00%
Debt instrument maturity date	Apr. 15, 2029
Interest on the notes		payable semi-annually in arrears on April 15 and October 15 of each year, commencing on April 15, 2021.
Debt extinguishment charge	$ 453,300,000
Debt extinguishment costs	$ 2,900,000

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

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