The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Separation from CNX Resources Corporation (Narrative) (Details) - business		1 Months Ended	12 Months Ended
	Nov. 28, 2017	Dec. 31, 2016	Dec. 31, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Number of independent businesses			2
ParentCo
Business Acquisition [Line Items]
Number of independent businesses	2	2
CNX Coal Resources LP \| Pennsylvania Mining Operations
Business Acquisition [Line Items]
Undivided interest stake (as a percent)				25.00%