Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Jul. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) a	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 01, 2018 USD ($)
Significant Acquisitions and Disposals
Capitalized Costs, Proved Properties				$ 3,700		$ 2,100	$ 4,100
Second Lien Facility						200,000	200,000
Property, Plant and Equipment, Gross						1,623,591	1,488,334
Asset Retirement Obligation				4,314		5,461	4,934
Mid-Continent Divestiture [Member]
Significant Acquisitions and Disposals
Proceeds from Sale of Oil and Gas Property and Equipment	$ 6,200			6,000
Cash Paid to Buyer in Connection with Final Settlement				500
Cash Paid for Suspended Revenues in Connection with FInal Settlement				200
Asset Retirement Obligation	300	$ 300
Working Capital Adjustments, Net	1,300	1,300
Pre-Tax Operating Income Attributable to Assets Sold				(1,600)
Undeveloped Acreage [Member]
Significant Acquisitions and Disposals
Proceeds from Sale of Oil and Gas Property and Equipment				1,700
Working Interests Acquisition [Member] [Domain]
Significant Acquisitions and Disposals
Cash Paid on Date of Acquisition							$ 6,500
Hunt Acquisition [Member]
Significant Acquisitions and Disposals
Capitalized Costs, Proved Properties								$ 82,443
Area of Land | a					9,700
Other Payments to Acquire Businesses					$ 86,000
Cash Paid on Date of Acquisition								83,000
Accumulated Costs, net of suspended revenues, for wells in which Hunt elected not to participate								13,778
Business Acquisition, Transaction Costs				400	$ 100	$ 500		96,978
Capitalized Costs, Proved Properties								16,339
Asset Retirement Obligation								356
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net								96,978
Working Capital Adjustments, Net	$ (245)	(245)
Cash Received for Suspended Revenues Attributable to Acquired Properties		$ 1,448
Net Cash Paid on Date of Acquisition								$ 82,955
Devon Acquisition [Member]
Significant Acquisitions and Disposals
Business Acquisition, Revenue Reported by Acquired Entity since Acquisition Date			$ 400
Business Acquisition, Pro Forma Revenue				446,077
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax				$ 227,930
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares				$ 15.14
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares				$ 14.91
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 200