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Segment Information (Details) - segment	3 Months Ended
	Mar. 31, 2018	Jan. 03, 2018	Dec. 14, 2017	Dec. 13, 2017
Segment Reporting Information [Line Items]
Number of principal business divisions	2
E&P Division [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	4
Coal Division [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	3
CNX Gathering LLC [Member]
Segment Reporting Information [Line Items]
Ownership percentage in equity method investment	50.00%	50.00%	50.00%	50.00%
Variable Interest Entity, Primary Beneficiary [Member]
Segment Reporting Information [Line Items]
Variable interest entity, ownership percentage	34.00%

X

- Definition

Number of Divisions

+ References

No definition available.

+ Details

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- Definition

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

+ References

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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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

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- Details

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- Details

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- Details

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