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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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