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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, 2020	Dec. 31, 2019	Jul. 16, 2019	Aug. 03, 2018
Assets:
Derivative asset, current	$ 8,913	$ 75,304
Liabilities:
Derivative liability, current	$ 47,005	222
7½% Senior Notes Due 2025 | Covey Park Equity Owners
Liabilities:
Interest rate on debt instrument	7.00%		7.50%
9¾% Senior Notes Due 2026
Liabilities:
Interest rate on debt instrument	9.00%			9.75%
Bank credit facility
Liabilities:
Long-term debt, Carrying Value	$ 500,000	1,250,000
Long-term debt, Fair Value	500,000	1,250,000
Level 1 | 7½% Senior Notes Due 2025
Liabilities:
Long-term debt, Carrying Value	473,728	455,768
Long-term debt, Fair Value	628,691	534,375
Level 1 | 9¾% Senior Notes Due 2026
Liabilities:
Long-term debt, Carrying Value	1,577,824	820,057
Long-term debt, Fair Value	1,769,625	765,000
Commodity-Based Derivatives | Level 2 and Level 3
Assets:
Derivative asset, current	9,574	89,192
Derivative asset, Fair value	9,574	89,192
Liabilities:
Derivative liability, current	49,369	4,442
Derivative liabilities, Fair value	$ 49,369	$ 4,442

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