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Acquisitions and Dispositions - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) a Well
Business Acquisition [Line Items] |  |
Purchase of non-controlling interests | $ 499,000 | $ 65,000
Capital expenditures, including exploration expense | 18,046,000 | 47,073,000
Proceeds from sale of property and equipment | 4,579,000 | $ 3,233,000
Reagan County, Texas [Member] | Mineral Acreage [Member] |  |
Business Acquisition [Line Items] |  |
Number of net acres acquired | a |  | 464
Number of gross mineral acres acquired | a |  | 1,640
Capital expenditures, including exploration expense |  | $ 6,080,000
Number of oil wells with working interest ownership |  | 51
Number of commercial salt water disposal well operated | Well |  | 1
Reagan County, Texas [Member] | Mineral Acreage [Member] | Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of working interest ownership |  | 16.60%
Reagan County, Texas [Member] | Mineral Acreage [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of working interest ownership |  | 33.40%
Oklahoma Kansas Colorado and Texas [Member] | Mineral Acreage [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of property and equipment | $ 4,300,000 | $ 3,100,000

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