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Acquisitions and Dispositions - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Purchase of non-controlling interests | $ 65,000 | $ 308,000 |
Capital expenditures, including exploration expense | 47,073,000 | 59,361,000 |
Proceeds from sale of property and equipment | $ 3,233,000 | 46,231,000 |
West Texas and Oklahoma [Member] | Mineral Acreage [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of property and equipment |  | 46,000,000 |
Martin County [Member] | Mineral Acreage [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of property and equipment |  | $ 37,400,000 |
Number of net acres sold or farmed-out leasehold rights | a |  | 2,096 |
OKLAHOMA | Mineral Acreage [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of property and equipment |  | $ 8,600,000 |
Number of net acres sold or farmed-out leasehold rights | a |  | 1,554 |
Upton County, Texas [Member] | Mineral Acreage [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of net acres acquired | a |  | 118 |
Capital expenditures, including exploration expense |  | $ 596,600 |
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 |  |
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% |  |
Texas, Oklahoma, Kansas, Colorado and Wyoming [Member] | Mineral Acreage [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of property and equipment | $ 3,100,000 |  |
Partnership And Trust [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase of non-controlling interests | $ 65,000 | $ 308,000 | $ 308,000

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