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Acquisitions and Dispositions of Oil and Gas Properties - Additional Information (Detail) $ in Thousands, shares in Millions						1 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Nov. 01, 2019 a well shares	Dec. 19, 2018 USD ($) a	Sep. 21, 2018 USD ($)	Aug. 14, 2018 USD ($)	Jul. 31, 2018 USD ($) a well	Apr. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Aug. 13, 2018 USD ($)	Dec. 31, 2020 USD ($) acres	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jul. 16, 2019 USD ($) a well
Business Acquisition [Line Items]
Property acquisitions | $							$ 21,013	$ 39,323	$ 0	$ 2,097,451
Working interests re-acquired under the joint venture | $				$ 17,900
Proceeds from sale of undeveloped acreage | $			$ 13,700
Covey Park Acquisition
Business Acquisition [Line Items]
Oil and gas properties, gross acres | a												317,142
Oil and gas properties, net acres | a												248,196
Producing natural gas wells, gross												1,230
Producing natural gas wells, net												712.0
Producing Haynesville shale natural gas wells, gross												844
Producing Haynesville shale natural gas wells, net												383.0
Merger value | $											$ 2,225,608	$ 2,226,682
Privately Held Company
Business Acquisition [Line Items]
Oil and gas properties, gross acres | a	7,702
Oil and gas properties, net acres | a	3,155
Producing natural gas wells, gross	75
Producing natural gas wells, net	20.1
Producing Haynesville shale natural gas wells, gross	36
Producing Haynesville shale natural gas wells, net	11.7
Privately Held Company | Common Stock
Business Acquisition [Line Items]
Shares issued as consideration | shares	4.5
North Louisiana and Texas Properties
Business Acquisition [Line Items]
Property acquisitions | $					$ 41,500
Oil and gas properties, gross acres | a					22,559
Oil and gas properties, net acres | a					12,085
Producing natural gas wells, gross					114
Producing natural gas wells, net					27.8
Producing Haynesville shale natural gas wells, gross					47
Producing Haynesville shale natural gas wells, net					14.6
Harrison and Panola Counties, Texas
Business Acquisition [Line Items]
Oil and gas properties, net acres | a		5,301
Amount payable on acquisition of interest in Haynesville shale rights | $		$ 20,500
Payment term for acquisition of interest in Haynesville shale rights		4 years
Percentage of interest provided in each well drilled by company		12.00%
South Texas Sold Properties
Business Acquisition [Line Items]
Gross proceeds from sale of oil and gas properties | $						$ 106,400
South Texas Asset Held for Sale
Business Acquisition [Line Items]
Loss on sale of oil and gas properties | $								$ 32,700
Oil and Gas Properties
Business Acquisition [Line Items]
Number of acres leased | acres									13,519
Total lease cost | $									$ 7,900

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