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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
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ (21,749)	$ 61,899
Natural gas price derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(18,877)	42,975
Oil price derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(3,544)	18,924
Interest rate derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ 672	$ 0

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+ References

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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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