Acquisitions and Dispositions - Additional Information (Detail)	9 Months Ended
Sep. 30, 2018 USD ($) a Well	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 10,000	$ 60,000
Proceeds from sale of property and equipment	2,623,000	46,977,000
Capital expenditures, including exploration expense	29,317,000	40,057,000
Texas, Oklahoma, Kansas, Colorado and Wyoming [Member] \| Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	$ 3,000,000
Reagan County, Texas [Member] \| Mineral Acreage [Member]
Business Acquisition [Line Items]
Number of net acres sold or farmed-out leasehold rights \| a	464
Number of oil wells with working interest ownership \| Well	53
Number of commercial salt water disposal well operated \| Well	1
Capital expenditures, including exploration expense	$ 6,080,000
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%
Partnership And Trust [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 10,000	$ 60,000

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
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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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-Publisher FASB
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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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