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Long-Term Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 04, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt issuance costs, net of amortization	$ (40,337)
Long-term debt	2,800,478		$ 2,517,149
Bank Credit Facility:
Debt Instrument [Line Items]
Principal	550,000
7.50% Senior Notes due 2025:
Debt Instrument [Line Items]
Principal	244,400
Discount, net of amortization	$ (55,096)
Interest rate on debt instrument	7.50%	7.50%
9.75% Senior Notes due 2026:
Debt Instrument [Line Items]
Principal	$ 872,934
Discount, net of amortization	$ (28,866)
Interest rate on debt instrument	9.75%	9.75%
6.75% Senior Notes due 2029:
Debt Instrument [Line Items]
Principal	$ 1,250,000
Premium, net of amortization	$ 7,443
Interest rate on debt instrument	6.75%	6.75%