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Commitments and Contingencies Additional Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Subsidiaries
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Jun. 30, 2013
Commonwealth Park Property
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Jun. 30, 2013
South Carolina Electric Gas Company [Member]
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Jun. 30, 2012
South Carolina Electric Gas Company [Member]
Counterclaim [Member]
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Jun. 30, 2012
South Carolina Electric Gas Company [Member]
Award Amount [Member]
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Jun. 30, 2012
South Carolina Electric Gas Company [Member]
Interest Rate on Amount Awarded [Member]
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Jun. 30, 2012
South Carolina Electric Gas Company [Member]
Attorney Fees [Member]
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Jun. 30, 2013
PCB Soil Removal Action
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Jun. 30, 2013
American electric corp [Member]
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Dec. 31, 2012
American electric corp [Member]
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Dec. 31, 2007
Earl Kennedy
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Jun. 30, 2013
Cnx Gas Stock Acquisition [Member]
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Dec. 31, 2012
Cnx Gas Stock Acquisition [Member]
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Jun. 30, 2013
Ratliff [Member]
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| Commitments and Contingencies Disclosure [Line Items] | ||||||||||||||||
| Loss Contingency, Range of Possible Loss, Portion Not Accrued | $ 792,000,000 | |||||||||||||||
| Claims by plaintiff | The Commonwealth claimed that the Company is liable for dam reconstruction costs, lake restoration costs and natural resource damages totaling $58,000. | 36000 | The complaint, as amended, seeks injunctive relief, including removing CNX Gas Company from the property, and compensatory damages of $20,000. | $4,000 to $8,000 | ||||||||||||
| The current estimated cost of remedial action for the area CONSOL Energy was originally named a PRP, including payment of the EPA's past and future cost, is approximately | 36,000,000 | 65,000,000 | 5,400,000 | 20,200 | ||||||||||||
| Litigation Settlement, Gross | 250,000 | |||||||||||||||
| Counterclaim by the company | 9400 | 9735 | 8.75 | 1873 | 408 | |||||||||||
| Sale of Stock, Price Per Share | $ 38.25 | |||||||||||||||
| Loss Contingency, Settlement Agreement, Court | 42730 | |||||||||||||||
| Loss Contingency, Estimate of Possible Loss | 20,000,000 | 11,000,000 | ||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 13,728,000 | 2,000,000 | ||||||||||||||
| CONSOL Energy's portion of probable recoveries from settled claims | 4,369,000 | |||||||||||||||
| Remaining liability in PCB soil removal action | 798,645,000 | 768,494,000 | 2,762,000 | |||||||||||||
| Loss Contingency, Damages Sought, Value | $ 384,000 | |||||||||||||||
| Commitments and Contingent, number of asbestos claims | 6,900 | |||||||||||||||