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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Gains and Losses from Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (510,319) | $ (121,579) | $ (756,026) | $ (71,978)
Natural gas price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (509,777) | (120,706) | (748,499) | (82,872)
Oil price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (287) | (989) | (7,820) | 13,529
Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (255) | $ 116 | $ 293 | $ (2,635)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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