Summary of Significant Accounting Policies - Additional Information 1 (Detail)		1 Months Ended	3 Months Ended
	Aug. 14, 2018 USD ($) $ / bbl $ / Mcf shares	Apr. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) $ / bbl $ / Mcf	Dec. 31, 2018 USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items]
Jones contribution transaction, ownership percentage	84.00%
Jones contribution transaction, Shares issued | shares	88,571,429
Purchase price allocation period	12 months
Impairment of oil and gas properties			$ 0
Goodwill	$ 350,214,000		350,214,000		$ 350,214,000
Cash flow hedges derivative instruments			$ 0
Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Impairment of oil and gas properties				$ 0
South Texas Sold Properties | Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Gross proceeds from sale of oil and gas properties		$ 106,400,000
Bakken Shale Properties
Operations And Summary Of Significant Accounting Policies [Line Items]
Oil and gas property cost basis	397,600,000
Oil and gas property capitalized costs	554,300,000
Oil and gas property accumulated depletion, depreciation and amortization	$ 156,700,000
Goodwill Oil and Gas Property Valuation
Operations And Summary Of Significant Accounting Policies [Line Items]
Management's oil price outlook | $ / bbl	79.72
Management's gas price outlook | $ / Mcf	3.87
Annual minimum discount rate	10.00%
Annual maximum discount rate	25.00%
South Texas Asset Held for Sale | Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Management's oil price outlook | $ / bbl				72.03
Management's gas price outlook | $ / Mcf				4.31
Annual minimum discount rate				20.00%
Annual maximum discount rate				25.00%
Loss on sale of oil and gas properties				$ 28,600,000