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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 + Details
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