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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | $ 10,765 | $ 8,913
Derivative Financial Instruments – long-term | 830 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 255,127 | 47,005
Derivative Financial Instruments – long-term | 14,157 | 2,364
Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 10,765 | 8,913
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 255,127 | 47,005
Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 830 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 14,157 | 2,364
Natural gas price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 6,419 | 8,913
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 244,304 | 45,158
Natural gas price derivatives | Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 798 | 661
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 14,157 | 1,308
Oil price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 4,346 | 0
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 9,828 | 831
Interest rate derivatives | Derivative Financial Instruments – current |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 995 | 1,016
Interest rate derivatives | Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 32 | 0
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | $ 0 | $ 1,056

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