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Consolidated Statement of Comprehensive Income Parentheticals (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Other Comprehensive Income (Loss), Tax $ 10,465us-gaap_OtherComprehensiveIncomeLossTax $ 53,990us-gaap_OtherComprehensiveIncomeLossTax $ 121,484us-gaap_OtherComprehensiveIncomeLossTax
Adjustment For Actuarially Determined Liabilities [Member]      
Other Comprehensive Income (Loss), Tax 56,304us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember		 (276,928)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember		 (77,871)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember
Cash Flow Hedging [Member]      
Other Comprehensive Income (Loss), Tax $ 55,767us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CashFlowHedgingMember		 $ (29,407)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CashFlowHedgingMember		 $ (73,593)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CashFlowHedgingMember