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Property, Plant and Equipment Joint Participation Agreements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Hess [Member]
drilling carry billed	$ 99,474,000cnx_DrillingCarryBilled / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cnx_HessMember
Drilling commitment carry	335,000,000cnx_DrillingCommitmentCarry / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cnx_HessMember
Noble JV [Member]
drilling carry billed	1,627,065,000cnx_DrillingCarryBilled / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cnx_NobleJvMember
Drilling commitment carry	1,846,000,000cnx_DrillingCommitmentCarry / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cnx_NobleJvMember
Maximum Drilling Commitment Carry		$ 400,000cnx_MaximumDrillingCommitmentCarry / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cnx_NobleJvMember

X

- Definition

drilling carry billed

+ References

No definition available.

+ Details

Name:	cnx_DrillingCarryBilled
Namespace Prefix:	cnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Drilling commitment carry - dollars committed to pay by joint venture partner for drill carry

+ References

No definition available.

+ Details

Name:	cnx_DrillingCommitmentCarry
Namespace Prefix:	cnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maximum Annual Drilling Commitment Carry

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=cnx_HessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=cnx_NobleJvMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: