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Property, Plant and Equipment Assets Amortized by Units of Production (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets Amortized By Units of Production [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | $ 1,540,835 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | $ 1,463,406 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Coal Properties And Surface Lands | 1,358,306 cnx_CoalPropertiesAndSurfaceLands | 1,404,056 cnx_CoalPropertiesAndSurfaceLands
Mine development | 414,501 cnx_MineDevelopment | 354,607 cnx_MineDevelopment
Property Subject to or Available for Operating Lease, Gross | 263,946 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross | 393,372 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross
Prepaid Royalties | 386,245 us-gaap_PrepaidRoyalties | 381,348 us-gaap_PrepaidRoyalties
Airshafts | 468,924 cnx_Airshafts | 397,466 cnx_Airshafts
Advances for Gas Exploration, Development and Production Amount | 20,580 us-gaap_AdvancesForGasExplorationDevelopmentAndProductionAmount | 22,668 us-gaap_AdvancesForGasExplorationDevelopmentAndProductionAmount
Property, Plant and Equipment, Gross | 14,674,777 us-gaap_PropertyPlantAndEquipmentGross | 13,578,509 us-gaap_PropertyPlantAndEquipmentGross
Assets amortized by units of production [Member] |  |
Assets Amortized By Units of Production [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | 1,540,835 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 1,463,406 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Coal Properties And Surface Lands | 477,444 cnx_CoalPropertiesAndSurfaceLands / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 273,242 cnx_CoalPropertiesAndSurfaceLands / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Mine development | 11,984 cnx_MineDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 238,356 cnx_MineDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Property Subject to or Available for Operating Lease, Gross | 50,044 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 99,506 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Prepaid Royalties | 52,009 us-gaap_PrepaidRoyalties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 48,043 us-gaap_PrepaidRoyalties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Airshafts | 52,194 cnx_Airshafts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 38,794 cnx_Airshafts / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Advances for Gas Exploration, Development and Production Amount | 20,580 us-gaap_AdvancesForGasExplorationDevelopmentAndProductionAmount / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | 22,668 us-gaap_AdvancesForGasExplorationDevelopmentAndProductionAmount / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember
Property, Plant and Equipment, Gross | $ 2,205,090 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember | $ 2,184,015 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_AssetsAmortizedByUnitsOfProductionMember

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- Definition Discloses the period end balance sheet amount of advances for gas exploration, development and production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 835 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475453&loc=d3e70057-109498 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41457-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 + Details
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