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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4616395-111683

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands		6 Months Ended
	Aug. 01, 2020 USD ($) a	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Purchase of non-controlling interests		$ 0	$ 256
Proceeds from sale of property and equipment		$ 194	$ 1,693
West Texas [Member] \| Mineral Acreage [Member] \| Scenario, Forecast [Member]
Business Acquisition [Line Items]
Number Of Gross Mineral Acres Sold \| a	2,000
Proceeds From Sale Of Noncore Acreage And Properties	$ 10,000
West Virginia [Member] \| Mineral Acreage [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Proceeds from sale of property and equipment	$ 200
Number Of Gross Mineral Acres Sold \| a	31,000