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Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) a	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Purchase of Non- controlling Interest	$ 0	$ 306
Proceeds from sale of property and equipment	$ 10,777	$ 1,808
Reagan County, Texas [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Number Of Gross Mineral Acres Sold | a	1,950
Disposal of asssets consideration receivable	$ 10,700
West Virginia [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	$ 200
Number Of Gross Mineral Acres Sold | a	31,000

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
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