Summary of Property and Equipment (Detail) $ in Thousands	4 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) $ / bbl	Dec. 31, 2017 USD ($) $ / bbl	Sep. 12, 2016 $ / bbl	Dec. 31, 2015 $ / bbl
Property, Plant and Equipment [Line Items]
Proved Oil and Gas Property, Full Cost Method	$ 251,083	$ 460,029
Unproved Oil and Gas Property excluded	4,700	117,600
Oil and gas properties:
Unproved Oil and Gas Property, Full Cost Method	4,719	117,634
Oil and Gas Property, Full Cost Method, Gross	255,802	577,663
Other property and equipment	3,575	12,712
Total property and equipment	259,377	590,375
Accumulated depreciation, depletion and amortization	(11,904)	(61,316)
Property and equipment, net (successful efforts method)	247,473	529,059
Predecessor [Member]
Property, Plant and Equipment [Line Items]
Amortization Expense Per Physical Unit of Production | $ / bbl			10.04	42.22
Successor [Member]
Property, Plant and Equipment [Line Items]
Undeveloped Leasehold Costs Transferred	3,800	40,400
Interest Costs Capitalized	$ 100	$ 2,700
Amortization Expense Per Physical Unit of Production | $ / bbl	11.21	12.87
Capitalized Costs, Proved Properties	$ 500	$ 2,400