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Discontinued Operations (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Benefit Obligations Assumed By Murray Energy   $ 2,050,656,000cnx_BenefitObligationsAssumedByMurrayEnergy
Discontinued Operations [Member]    
Gain (Loss) on Sale of Property Plant Equipment 7,044,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
1,035,346,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Proceeds from Sale of Property, Plant, and Equipment   825,285,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Restructuring Costs   $ 24,715,000us-gaap_RestructuringCosts
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember