Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended	8 Months Ended	12 Months Ended
		Oct. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)	May 31, 2015 USD ($)	Dec. 31, 2017 USD ($) a	Sep. 12, 2016 USD ($)	Dec. 31, 2017 USD ($) a $ / shares	Dec. 31, 2015 USD ($)	Feb. 28, 2018 USD ($)	Nov. 01, 2017 USD ($)	Sep. 29, 2017 USD ($) a	Dec. 31, 2016 USD ($)
Significant Acquisitions and Disposals
Business Acquisition, Revenue Reported by Acquired Entity since Acquisition Date					$ 9,000
Business Acquisition, Pro Forma Revenue							$ 184,831
Escrow Amount Transferred											$ 7,100
Second Lien Facility					200,000		200,000					$ 0
Business Acquisition, Transaction Costs					1,300		1,300
Escrow Deposit Remaining	[1]				3,210		3,210					0
Property, Plant and Equipment, Gross					590,375		590,375					$ 259,377
Asset Retirement Obligation						$ 2,700		$ 2,621
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax							$ 23,360
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares							$ 0
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares							$ 0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ 4,000
Hunt Acquisition [Domain]
Significant Acquisitions and Disposals
Acreage, Net | a					9,700		9,700
Other Payments to Acquire Businesses							$ 86,000
Devon Acquisition [Member]
Significant Acquisitions and Disposals
Capitalized Costs, Proved Properties											$ 42,891
Acreage, Net | a											19,600
Other Payments to Acquire Businesses							205,000
Escrow Deposit											$ 10,300
Cash Paid on Date of Acquisition					$ 190,599		190,599				189,900
Additional working interests										$ 700
Amount Transferred from Escrow Account											7,049
Escrow Deposit Remaining					$ 3,200		3,200
Capitalized Costs, Proved Properties											146,686
Property, Plant and Equipment, Gross											8,642
Asset Retirement Obligation											494
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net											197,725
Working Capital Adjustments, Net											(2,429)
Preliminary Purchase Price											$ 197,725
Subsequent Event [Member]
Significant Acquisitions and Disposals
Amount Transferred from Escrow Account									$ 2,506
Escrow Distributed									$ 700
Predecessor [Member]
Significant Acquisitions and Disposals
Loss (gain) on sales of assets, net						(1,261)		(41,335)
Asset Retirement Obligation						$ 2,687
Predecessor [Member] | Eagle Ford Shale, Lavaca County [Member]
Significant Acquisitions and Disposals
Proceeds from Sale of Oil and Gas Property and Equipment		$ 12,500
Gain on sale of oil and gas property							$ 9,500
Predecessor [Member] | Granite Wash [Member]
Significant Acquisitions and Disposals
Proceeds from Sale of Oil and Gas Property and Equipment		$ 100
Predecessor [Member] | East Texas [Member]
Significant Acquisitions and Disposals
Proceeds from Sale of Oil and Gas Property and Equipment			$ 73,000
Gain on sale of oil and gas property				$ 43,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment				29,500
Disposal Group, Including Discontinued Operation, Assets				33,300
Disposal Group, Including Discontinued Operation, Asset Retirement Obligation				$ 3,800
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax								$ 1,300

[1] 1 Represents amount remaining in the Escrow Account for the Devon Acquisition which will fully fund the remaining liability due to Devon for the final settlement (see Note 5).