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