Acquisitions and Dispositions - Additional Information (Detail)	3 Months Ended
Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) a Well Transactions
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 256,000
Capital expenditures, including exploration expense	5,213,000	$ 10,734,000
Proceeds from sale of property and equipment	668,000	$ 1,816,000
Reagan County, Texas [Member] \| Mineral Acreage [Member]
Business Acquisition [Line Items]
Number of net acres acquired \| a		464
Capital expenditures, including exploration expense		$ 6,080,000
Number of oil wells with working interest ownership \| Well		53
Number of transactions \| Transactions		2
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%
Texas, Oklahoma, Kansas and Colorado [Member] \| Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	700,000	$ 2,800,000
Partnership And Trust [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 256,000

Number of commercial salt water disposal well operated.

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Number of net acres acquired.

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Number of oil wells with working interest ownership.

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Percentage of working interest ownership.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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