Short-Term Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Senior Secured Credit Facility April122016 Member [Member]
Short-term Debt [Line Items]
Credit facility, face amount	$ 1,000,000	$ 1,500,000
Additional Capacity Available On Credit Lines At Request	250,000
Minimum interest coverage ratio	1.50
Interest coverage ratio	2.21
Senior secured leverage ratio, maximum	2.00
Letters of credit outstanding	206,988	100,292
Borrowings and issuance of letters of credit remaining capacity	793,012	1,399,708
CNX Gas Senior Secured Credit Facility April122016 Member [Member]
Short-term Debt [Line Items]
Credit facility, face amount	1,000,000	1,000,000
Additional Capacity Available On Credit Lines At Request	250,000
Minimum interest coverage ratio	3.00
Interest coverage ratio	25.33
Maximum leverage ratio	3.50
Current maximum leverage ratio	0.61
Letters of credit outstanding	87,643	70,203
Borrowings and issuance of letters of credit remaining capacity	912,357	929,797
Interim Funding for Longwall Shields [Member]
Short-term Debt [Line Items]
Notes Payable, Current	$ 25,073
Short-term Debt, Weighted Average Interest Rate	2.46%