v2.4.0.8
Guarantor Subsidiaries Financial Information Gurantor Subsidiaries Statement of Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) $ (12,813) $ 152,710 $ (14,634) $ 249,906
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 42,904 7,586 88,661 67,159
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 45,749 10,663 27,154 86,739
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (9,528) (57,847) (32,241) (105,788)
Other Comprehensive Income (Loss), Net of Tax 79,125 (39,598) 83,574 48,110
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 66,312 113,112 68,940 298,016
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 287 29 544 29
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 66,599 113,141 69,484 298,045
Parent Issuer [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) (12,526) 152,739 (14,090) 249,935
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (42,904) (7,586) (88,661) (67,159)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (45,749) (10,663) (27,154) (86,739)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 9,528 57,847 32,241 105,788
Other Comprehensive Income (Loss), Net of Tax (79,125) 39,598 (83,574) (48,110)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 66,599 113,141 69,484 298,045
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 66,599 113,141 69,484 298,045
CNX Gas Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) (2,749) 726 (3,074) 8,180
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 0 0 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (45,749) (10,663) (27,154) (86,739)
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 9,528 57,847 32,241 105,788
Other Comprehensive Income (Loss), Net of Tax (36,221) 47,184 5,087 19,049
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 33,472 (46,458) (8,161) (10,869)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 287 29 544 29
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 33,759 (46,429) (7,617) (10,840)
Other Guarantors Subsidiaries [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) 217,808 92,585 321,350 246,901
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (42,904) (7,586) (88,661) (67,159)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0 0 0
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax (42,904) (7,586) (88,661) (67,159)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 260,712 100,171 410,011 314,060
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 260,712 100,171 410,011 314,060
Non-Guarantors [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) 7,570 3,284 9,798 7,176
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 0 0 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0 0 0
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 7,570 3,284 9,798 7,176
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 7,570 3,284 9,798 7,176
Consolidation, Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net Income (Loss) (222,916) (96,624) (328,618) (262,286)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 42,904 7,586 88,661 67,159
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 45,749 10,663 27,154 86,739
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (9,528) (57,847) (32,241) (105,788)
Other Comprehensive Income (Loss), Net of Tax 79,125 (39,598) 83,574 48,110
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (302,041) (57,026) (412,192) (310,396)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ (302,041) $ (57,026) $ (412,192) $ (310,396)