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Acquisitions and Dispositions - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) a Well
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 256,000	$ 10,000
Capital expenditures, including exploration expense	11,412,000	18,709,000
Proceeds from sale of property and equipment	1,693,000	2,112,000
Texas, Oklahoma, Colorado and West Virginia [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	1,600,000	$ 2,800,000
Oklahoma Kansas Colorado and 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
Proceeds from sale of property and equipment		$ 2,190,000
Partnership And Trust [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 256,000	$ 10,000

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Number of net acres acquired.

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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
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
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-Topic 505
-SubTopic 10
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-Paragraph 1
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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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-Topic 230
-SubTopic 10
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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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