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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ (12,298)	$ 14,744	$ 49,601	$ 7,087
Gain (Loss) from Derivative Financial Instruments
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(12,298)	14,744	49,601	7,087
Gain (Loss) from Derivative Financial Instruments | Natural Gas Price Derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(5,140)	7,302	37,835	10,458
Gain (Loss) from Derivative Financial Instruments | Oil Price Derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(4,406)	$ 7,442	14,518	$ (3,371)
Gain (Loss) from Derivative Financial Instruments | Interest Rate Derivatives
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ (2,752)		$ (2,752)

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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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