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Summary of Significant Accounting Policies - Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | $ 8,830 | $ 75,304
Derivative Financial Instruments – long-term | 1,185 | 13,888
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 63,595 | 222
Derivative Financial Instruments – long-term | 66,373 | 4,220
Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 8,830 | 75,304
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 63,595 | 222
Derivative Financial Instruments – long-term |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 66,373 | 4,220
Natural gas price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 6,405 | 75,123
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 62,652 | 0
Natural gas price derivatives | Derivative Financial Instruments – long-term |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 1,185 | 13,888
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 64,814 | 4,220
Oil price derivatives | Derivative Financial Instruments – current |  |
Asset Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 2,425 | 181
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 0 | 222
Oil price derivatives | Derivative Financial Instruments – long-term |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | 20 | 0
Interest rate derivatives | Derivative Financial Instruments – current |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – current | 943 | 0
Interest rate derivatives | Derivative Financial Instruments – long-term |  |
Liability Derivative Financial Instruments: |  |
Derivative Financial Instruments – long-term | $ 1,539 | $ 0

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