Quarterly report pursuant to Section 13 or 15(d)

Leased Properties (Details 1)

v2.4.1.9
Leased Properties (Details 1) (Eastern Interconnect Project [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
kV
mi
Mar. 31, 2014
Eastern Interconnect Project [Member]
   
Sale Leaseback Transaction [Line Items]    
Length of transmission lines physical assets 216corr_LengthOfTransmissionLinesPhysicalAssets
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= corr_EasternInterconnectProjectMember
 
Power of transmission lines physical assets 345corr_PowerOfTransmissionLinesPhysicalAssets
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= corr_EasternInterconnectProjectMember
 
Estimated useful lives of assets 20 years  
Amount of depreciation of leased property $ 570us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= corr_EasternInterconnectProjectMember
$ 570us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= corr_EasternInterconnectProjectMember