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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
	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

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