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Subsequent Events (Details) - Subsequent Event [Member]	May 02, 2018 USD ($) wells
Subsequent Event [Line Items]
Proceeds from Asset Exchange Agreement | $	$ 7,000
Minimum commitment of wells | wells	40
Non-Core Midstream Assets, Dedicated Acreage, Surface Acreage [Member]
Subsequent Event [Line Items]
Ownership percentage	95.00%

X

- Definition

Proceeds from Asset Exchange Agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	cnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Wells, Minimum Commitment

+ References

No definition available.

+ Details

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Namespace Prefix:	cnx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cnx_NonCoreMidstreamAssetsDedicatedAcreageSurfaceAcreageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: