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
	Dec. 31, 2018 $ / bbl $ / Mcf	Aug. 13, 2018 $ / bbl $ / Mcf	Dec. 31, 2019 $ / bbl $ / Mcf	Dec. 31, 2017 $ / bbl $ / Mcf
Crude Oil and NGL Per Barrel
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales prices | $ / bbl	61.21		55.69
Crude Oil and NGL Per Barrel | Predecessor
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales prices | $ / bbl		62.29		48.71
Natural Gas Per Thousand Cubic Feet
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales prices | $ / Mcf	2.90		2.58
Natural Gas Per Thousand Cubic Feet | Predecessor
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales prices | $ / Mcf		2.74		2.88