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Segment Information Reconciliation of Earnings Before Income Tax (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Excludes Gas Segment [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Interest Income (Expense), Net and Other Non-operating Activity | $ (223,564)cnx_InterestAndOtherNonoperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember | $ (219,198)cnx_InterestAndOtherNonoperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember | $ (220,042)cnx_InterestAndOtherNonoperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember
Fees For Disposing Non Core Assets | 9,785 cnx_FeesForDisposingNonCoreAssets / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember | 15,168 cnx_FeesForDisposingNonCoreAssets / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember | (6,584)cnx_FeesForDisposingNonCoreAssets / us-gaap_StatementBusinessSegmentsAxis = cnx_ExcludesGasSegmentMember
Corporate, Adjustments and Eliminations |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Gain (Loss) Estimates on Extinguishment of Debt | (95,267)cnx_GainLossEstimatesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = cnx_CorporateAdjustmentsAndEliminationsMember | 0 cnx_GainLossEstimatesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = cnx_CorporateAdjustmentsAndEliminationsMember | 0 cnx_GainLossEstimatesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = cnx_CorporateAdjustmentsAndEliminationsMember
Intersegment Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment Reporting Information Net Settlements | $ (52,600)cnx_SegmentReportingInformationNetSettlements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (45,137)cnx_SegmentReportingInformationNetSettlements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (40,897)cnx_SegmentReportingInformationNetSettlements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

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- Definition Fees for Disposing Non Core Assets + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain (Loss) Estimates on Extinguishment of Debt + References No definition available. + Details
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Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest and Other Nonoperating Income (Expense), Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Segment Reporting Information, Net Settlements + References No definition available. + Details
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Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
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Period Type: |