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Acquisitions and Dispositions - Additional Information (Detail)	3 Months Ended				9 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) a Well
Business Acquisition [Line Items]
Purchase of non-controlling interests	$ 50,000		$ 256,000	$ 10,000	$ 306,000	$ 10,000
Capital expenditures, including exploration expense					16,070,000	29,317,000
Proceeds from sale of property and equipment					1,808,000	2,623,000
Texas, Oklahoma, Colorado and West Virginia [Member] | Mineral Acreage [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment					1,600,000	$ 3,000,000
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
Partnership And Trust [Member]
Business Acquisition [Line Items]
Purchase of non-controlling interests					$ 306,000	$ 10,000

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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
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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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