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Indebtedness - New Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 31,819	$ 30,625
9.25% Senior Notes Due 2026
Debt Instrument [Line Items]
Aggregate principal amount		$ 550,000			$ 300,000
Interest rate on notes		9.25%	9.25%	9.25%
Debt instrument maturity year		2026
Net proceeds after underwriting expenses		$ 541,400			295,000
Unamortized debt issuance costs		8,600			$ 5,000
Maximum redemption price of notes as percentage of principal amount			100.00%
5.75% Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes			5.75%	5.75%	5.75%	5.75%
Repayments of senior notes		$ 500,000
8.25% Senior Notes Due 2029 | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount	$ 600,000
Interest rate on notes	8.25%
Debt instrument maturity year	2029
Net proceeds after underwriting expenses	$ 590,800
Unamortized debt issuance costs	$ 9,200
Maximum redemption price of notes as percentage of principal amount	100.00%

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