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Acquisitions and Dispositions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) a Well	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 22,000	$ 499,000
Payments to acquire oil and gas property and equipment	10,523,000	18,046,000
Proceeds from sale of oil and gas property and equipment	10,900,000	4,300,000
Non cash acquisition of non controlling interests	36,000	111,000
Proceeds from liquidation of partnerships	720,000,000
Non cash distribution of non controlling interest	1,550,000,000
Non-Controlling Interest [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests	58,000	616,000
Non cash acquisition of non controlling interests	$ 36,000	$ 111,000
Reagan County [Member]
Business Acquisition [Line Items]
Number of Acres | a	232
Number of oil and well assets | Well	53
Payments to acquire oil and gas property and equipment	$ 343,000,000
Reagan County [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of working interest ownership in acquisition of Asset	15.00%
Reagan County [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of working interest ownership in acquisition of Asset	16.60%
Upton County [Member]
Business Acquisition [Line Items]
Number of Acres | a	9.36
Payments to acquire oil and gas property and equipment	$ 5,100,000

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