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Summary of Significant Accounting Policies - Summary of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 28, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets:
Derivative asset, current	$ 5,258			$ 8,913
Liabilities:
Derivative liability, current	181,945			47,005
7.5% Senior Notes due 2025
Liabilities:
Interest rate on debt instrument			7.50%
9.75% Senior Notes Due 2026
Liabilities:
Interest rate on debt instrument			9.75%
6.75% Senior Notes Due 2029
Liabilities:
Interest rate on debt instrument			6.75%
5.875% Senior Notes Due 2030
Liabilities:
Interest rate on debt instrument		5.875%
Bank credit facility
Liabilities:
Long-term debt, carrying value	235,000			500,000
Long-term debt, fair value	235,000			500,000
Level 1 | 7.5% Senior Notes due 2025
Liabilities:
Long-term debt, carrying value	196,998			473,728
Long-term debt, fair value	248,066			628,691
Level 1 | 9.75% Senior Notes Due 2026
Liabilities:
Long-term debt, carrying value	0			1,577,824
Long-term debt, fair value	0			1,769,625
Level 1 | 6.75% Senior Notes Due 2029
Liabilities:
Long-term debt, carrying value	1,256,874			0
Long-term debt, fair value	1,337,500			0
Level 1 | 5.875% Senior Notes Due 2030
Liabilities:
Long-term debt, carrying value	965,000			0
Long-term debt, fair value	989,125			0
Commodity-Based Derivatives | Level 2 and Level 3
Assets:
Derivative asset, current	5,258			9,574
Derivative asset, Fair value	5,258			9,574
Liabilities:
Derivative liability, current	185,987			49,369
Derivative liabilities, fair value	$ 185,987			$ 49,369

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