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Short-Term Notes Payable (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Rate | Dec. 31, 2013
Short-term Debt [Line Items] |  |
accelerated financing charges | $ 2,989 cnx_Acceleratedfinancingcharges |
Interest coverage ratio | 2.42 cnx_CurrentInterestRatio |
Senior Secured Credit Facility April122016 Member [Member] |  |
Short-term Debt [Line Items] |  |
Credit facility, face amount | 2,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember | 1,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember
letters of credit sub limit | 750,000 cnx_Lettersofcreditsublimit / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember |
Additional Capacity Available On Credit Lines At Request | 500,000,000 cnx_AdditionalCapacityAvailableOnCreditLinesAtRequest / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember |
Minimum interest coverage ratio | 2.50 cnx_MinimumInterestRatioPerCreditFacilityCovenant / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember |
Interest coverage ratio | 4.90 cnx_CurrentInterestRatio / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember |
Senior secured leverage ratio, maximum | 1.00 cnx_MaximumSecuredLeverageRatioPerCreditFacilityCovenant / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember |
Letters of credit outstanding | 244,418,000 cnx_LettersOfCreditAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember | 206,988,000 cnx_LettersOfCreditAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember
Borrowings and issuance of letters of credit remaining capacity | 1,755,582,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember | 793,012,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = cnx_SeniorSecuredCreditFacilityApril122016MemberMember
CNX Gas Senior Secured Credit Facility April122016 Member [Member] |  |
Short-term Debt [Line Items] |  |
Letters of credit outstanding |  | 87,643,000 cnx_LettersOfCreditAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = cnx_CnxGasSeniorSecuredCreditFacilityApril122016MemberMember
Borrowings and issuance of letters of credit remaining capacity |  | 912,357,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = cnx_CnxGasSeniorSecuredCreditFacilityApril122016MemberMember
Senior Subordinated Notes [Member] |  |
Short-term Debt [Line Items] |  |
Credit facility, face amount | $ 1,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = us-gaap_SeniorSubordinatedNotesMember |

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- Definition accelerated financing charges + References No definition available. + Details
Name: | cnx_Acceleratedfinancingcharges
Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of Additional Capacity That Can Be Added to Credit Line At CONSOL's Request + References No definition available. + Details
Name: | cnx_AdditionalCapacityAvailableOnCreditLinesAtRequest
Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Current Interest Ratio + References No definition available. + Details
Name: | cnx_CurrentInterestRatio
Namespace Prefix: | cnx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Letters Of Credit, Amount Outstanding + References No definition available. + Details
Name: | cnx_LettersOfCreditAmountOutstanding
Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition letters of credit sub limit + References No definition available. + Details
Name: | cnx_Lettersofcreditsublimit
Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum Secured Leverage Ratio per Credit Facility Covenant + References No definition available. + Details
Name: | cnx_MaximumSecuredLeverageRatioPerCreditFacilityCovenant
Namespace Prefix: | cnx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum Interest Ratio per Credit Facility Covenant + References No definition available. + Details
Name: | cnx_MinimumInterestRatioPerCreditFacilityCovenant
Namespace Prefix: | cnx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |