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Oil and Gas Reserves Information (Unaudited) - Summary of Prices Used in Determining Oil and Natural Gas Reserves Quantities and Cash Flows (Detail) | 5 Months Ended | 7 Months Ended | 12 Months Ended
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Dec. 31, 2018 $ / bbl $ / Mcf | Aug. 13, 2018 $ / Mcf $ / bbl | Dec. 31, 2020 $ / Mcf $ / bbl | Dec. 31, 2018 $ / Mcf $ / bbl
Crude Oil and NGL Per Barrel |  |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |  |
Average sales prices | $ / bbl | 55.69 | 61.21 | 39.57 | 62.29
Natural Gas Per Thousand Cubic Feet |  |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |  |
Average sales prices | $ / Mcf | 2.58 | 2.90 | 1.99 | 2.74

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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