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COMMITMENTS AND CONTINGENCIES (Details) (Pennsylvania Department of Environmental Protection (PaDEP), USD $) In Millions, unless otherwise specified | 3 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 15, 2010 item
Pennsylvania Department of Environmental Protection (PaDEP) |  |  |
Environmental Matters |  |  |
Modified Consent Order, number of households to be supplied potable water |  |  | 14
Aggregate amount of fines and civil penalties paid to PaDEP |  | $ 1.3 |
Aggregate amount of settlement paid to and accepted by the appellants |  | $ 2.2 |
Number of appellants who were allowed by PEHB to reinstate their appeal | 3 |  |

X
- Definition Represents the number of households which the entity agreed to supply with potable water. + References No definition available. + Details
Name: | cog_AccrualForEnvironmentalLossNumberOfHouseholdsSuppliedWithPotableWater
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the aggregate amount of settlement paid as of the balance sheet date to affected households. + References No definition available. + Details
Name: | cog_EnvironmentalLossAggregateAmountOfSettlementPaid
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of appellants to whom permission to reinstate their appeal has been granted. + References No definition available. + Details
Name: | cog_NumberOfAppellantsToWhomPermissionToReinstateTheirAppealHasBeenGranted
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate amount of payments for fines and civil payments to a regulatory agency as of the balance sheet date. + References No definition available. + Details
Name: | cog_PaymentsForEnvironmentalLossAggregateAmountOfFinesAndCivilPenaltiesPaid
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration