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Acquisitions and Dispositions - Additional Information (Detail) | 12 Months Ended
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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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