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Acquisitions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 acre
Business Acquisition [Line Items] |  |
Gas and Oil Area, Undeveloped, Gross | 112,617,000 us-gaap_GasAndOilAreaUndevelopedGross |
Columbia Energy Ventures [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Cost of Acquired Entity, Transaction Costs | $ 96,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = cnx_ColumbiaEnergyVenturesMember |
Other Liabilities, Current | 49,533 us-gaap_OtherLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = cnx_ColumbiaEnergyVenturesMember |
Other Long-term Debt, Noncurrent | 40,286 us-gaap_OtherLongTermDebtNoncurrent / us-gaap_BusinessAcquisitionAxis = cnx_ColumbiaEnergyVenturesMember |
Allegheny County Airport Lease [Member] |  |
Business Acquisition [Line Items] |  |
Reimbursement From JV Partner | 0.50 cnx_ReimbursementFromJVPartner / us-gaap_BusinessAcquisitionAxis = cnx_AlleghenyCountyAirportLeaseMember |
Gas and Oil Area, Undeveloped, Gross | 9,000 us-gaap_GasAndOilAreaUndevelopedGross / us-gaap_BusinessAcquisitionAxis = cnx_AlleghenyCountyAirportLeaseMember |
Business Acquisition, Cost of Acquired Entity, Transaction Costs | 46,315,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = cnx_AlleghenyCountyAirportLeaseMember |
Escrow Deposit | 0.076 us-gaap_EscrowDeposit / us-gaap_BusinessAcquisitionAxis = cnx_AlleghenyCountyAirportLeaseMember |
Dominion Acquisition Member |  |
Business Acquisition [Line Items] |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High | 190,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInTheRangeOfOutcomesContingentConsiderationLiabilityValueHigh / us-gaap_BusinessAcquisitionAxis = cnx_DominionAcquisitionMember |
Bonus Payment | 16,000 cnx_BonusPayment / us-gaap_BusinessAcquisitionAxis = cnx_DominionAcquisitionMember |
Acquisition Costs, Period Cost | 91,243,000 us-gaap_AcquisitionCosts / us-gaap_BusinessAcquisitionAxis = cnx_DominionAcquisitionMember |
Ryerson Park Lake and Dam [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High | 36,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInTheRangeOfOutcomesContingentConsiderationLiabilityValueHigh / us-gaap_BusinessAcquisitionAxis = cnx_RyersonParkLakeandDamMember |
Bonus Payment | 13,728,000 cnx_BonusPayment / us-gaap_BusinessAcquisitionAxis = cnx_RyersonParkLakeandDamMember |
Coal Lands and or Surface Rights |  | 506,000 cnx_CoalLandsAndOrSurfaceRights / us-gaap_BusinessAcquisitionAxis = cnx_RyersonParkLakeandDamMember
Marshall County WV Utica Assets [Member] |  |
Business Acquisition [Line Items] |  |
Gas and Oil Area, Undeveloped, Gross | 1,700,000 us-gaap_GasAndOilAreaUndevelopedGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_MarshallCountyWVUticaAssetsMember |
Gain (Loss) on Sale of Property Plant Equipment | 25,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_MarshallCountyWVUticaAssetsMember |
Burning Star 5 Sale [Member] [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from Sale of Property, Plant, and Equipment | 25,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_BurningStar5SaleMemberMember |
Gain (Loss) on Sale of Property Plant Equipment | 22,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_BurningStar5SaleMemberMember |
Potomac coal reserves [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from Sale of Property, Plant, and Equipment | 25,000,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_PotomaccoalreservesMember |
Gain (Loss) on Sale of Property Plant Equipment | $ 24,663,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cnx_PotomaccoalreservesMember |

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 5 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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