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Summary of Significant Accounting Policies - Summary of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 23, 2020 | Dec. 31, 2019
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Derivative financial instruments | $ 8,830 |  | $ 75,304
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Derivative financial instruments | $ 63,595 |  | 222
7.5% Senior Notes due 2025 |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Interest rate on debt instrument | 7.50% |  |
9.75% Senior Notes due 2026 |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Interest rate on debt instrument | 9.75% | 9.75% |
Bank Credit Facility |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Long-term debt, Carrying Value | $ 500,000 |  | 1,250,000
Long-term debt, Fair Value | 500,000 |  | 1,250,000
Level 1 | 7.5% Senior Notes due 2025 |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Long-term debt, Carrying Value | 467,917 |  | 455,768
Long-term debt, Fair Value | 586,882 |  | 534,375
Level 1 | 9.75% Senior Notes due 2026 |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Long-term debt, Carrying Value | 1,575,554 |  | 820,057
Long-term debt, Fair Value | 1,687,125 |  | 765,000
Derivative Financial Instruments | Level 2 and Level 3 |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Derivative financial instruments | 10,015 |  | 89,192
Derivative financial asset, Fair value | 10,015 |  | 89,192
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Derivative financial instruments | 129,968 |  | 4,442
Derivative financial liabilities, Fair value | $ 129,968 |  | $ 4,442

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