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Short-Term Notes Payable (Details) (USD $)	12 Months Ended
Short-Term Notes Payable (Details) (USD $)	Dec. 31, 2014 Rate	Dec. 31, 2013
Short-term Debt [Line Items]
accelerated financing charges	$ 2,989cnx_Acceleratedfinancingcharges
Interest coverage ratio	2.42cnx_CurrentInterestRatio
Senior Secured Credit Facility April122016 Member [Member]
Short-term Debt [Line Items]
Credit facility, face amount	2,000,000,000	1,000,000,000
letters of credit sub limit	750,000
Additional Capacity Available On Credit Lines At Request	500,000,000
Minimum interest coverage ratio	2.50
Interest coverage ratio	4.90
Senior secured leverage ratio, maximum	1.00
Letters of credit outstanding	244,418,000	206,988,000
Borrowings and issuance of letters of credit remaining capacity	1,755,582,000	793,012,000
CNX Gas Senior Secured Credit Facility April122016 Member [Member]
Short-term Debt [Line Items]
Letters of credit outstanding		87,643,000
Borrowings and issuance of letters of credit remaining capacity		912,357,000
Senior Subordinated Notes [Member]
Short-term Debt [Line Items]
Credit facility, face amount	$ 1,000,000