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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (223,958) | $ (12,298) | $ (245,707) | $ 49,601
Natural gas price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (219,845) | (5,140) | (238,722) | 37,835
Oil price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (3,989) | (4,406) | (7,533) | 14,518
Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (124) | $ (2,752) | $ 548 | $ (2,752)

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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=121590274&loc=SL5618551-113959 + Details
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