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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

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