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Derivative Financial Instruments and Hedging Activities - Schedule of Gains and Losses from Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Aug. 13, 2018	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ 10,465	$ 881	$ 9,951	$ 51,735
Gain (Loss) from Derivative Financial Instruments
Derivative [Line Items]
Gain (loss) from derivative financial instruments	10,465	881	9,951	51,735
Gain (Loss) from Derivative Financial Instruments | Natural gas price derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	528	881	353	60,694
Gain (Loss) from Derivative Financial Instruments | Oil price derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	9,937	0	12,059	(8,959)
Gain (Loss) from Derivative Financial Instruments | Interest rate derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ 0	$ 0	$ (2,461)	$ 0

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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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