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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | $ 26,392 | $ 8,913
Derivative Financial Instruments – long-term | 342 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 627,166 | 47,005
Derivative Financial Instruments – long-term | 50,127 | 2,364
Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 26,392 | 8,913
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 627,166 | 47,005
Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 342 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 50,127 | 2,364
Natural gas price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 23,815 | 8,913
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 620,408 | 45,158
Natural gas price derivatives | Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 236 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 50,127 | 1,308
Oil price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 2,577 | 0
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 5,739 | 831
Interest rate derivatives | Derivative Financial Instruments – current |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 1,019 | 1,016
Interest rate derivatives | Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 106 | 0
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | $ 0 | $ 1,056

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