Summary of Property and Equipment (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / bbl	Dec. 31, 2017 USD ($) $ / bbl	Dec. 31, 2016 $ / bbl	Sep. 12, 2016 $ / bbl
Property, Plant and Equipment [Line Items]
Proved Oil and Gas Property, Full Cost Method	$ 1,037,993	$ 460,029
Undeveloped Leasehold Costs Transferred	82,800	40,400
Interest Costs Capitalized	9,100	2,700
Unproved Oil and Gas Property excluded	63,500	117,600
Capitalized Costs, Proved Properties	3,700	2,400
Oil and gas properties:
Unproved Oil and Gas Property, Full Cost Method	63,484	117,634
Oil and Gas Property, Full Cost Method, Gross	1,101,477	577,663
Other property and equipment	20,383	12,712
Total property and equipment	1,121,860	590,375
Accumulated depreciation, depletion and amortization	(193,866)	(61,316)
Property and equipment, net (successful efforts method)	$ 927,994	$ 529,059
Successor [Member]
Property, Plant and Equipment [Line Items]
Amortization Expense Per Physical Unit of Production | $ / bbl	16.11	12.87	11.21
Predecessor [Member]
Property, Plant and Equipment [Line Items]
Amortization Expense Per Physical Unit of Production | $ / bbl				10.04