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Fair Value of Other Securities Fair Value of Other Securities (Details 4) (Fair Value, Inputs, Level 3 [Member], USD $)
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3 Months Ended |
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Mar. 31, 2015
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| Public Company Historical EBITDA Multiples [Member] | Minimum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Historical EBITDA Valuation Multiples |
9.6corr_FairValueAssumptionsHistoricalEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyHistoricalEbitdaMultiplesMember
|
| Public Company Historical EBITDA Multiples [Member] | Maximum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Historical EBITDA Valuation Multiples |
10.6corr_FairValueAssumptionsHistoricalEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyHistoricalEbitdaMultiplesMember
|
| Public Company Historical EBITDA Multiples [Member] | Weighted Average [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Historical EBITDA Valuation Multiples |
10.1corr_FairValueAssumptionsHistoricalEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyHistoricalEbitdaMultiplesMember
|
| Public Company Projected EBITDA Multiples [Member] | Minimum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Projected EBITDA Valuation Multiples |
8.3corr_FairValueAssumptionsProjectedEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyProjectedEbitdaMultiplesMember
|
| Public Company Projected EBITDA Multiples [Member] | Maximum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Projected EBITDA Valuation Multiples |
9.3corr_FairValueAssumptionsProjectedEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyProjectedEbitdaMultiplesMember
|
| Public Company Projected EBITDA Multiples [Member] | Weighted Average [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Projected EBITDA Valuation Multiples |
8.8corr_FairValueAssumptionsProjectedEBITDAValuationMultiples
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyProjectedEbitdaMultiplesMember
|
| Merger and Acquisition Company Analysis [Member] | Minimum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| EV/LTM 2012 EBITDA |
8.3corr_FairValueAssumptionsEVLTMEBITDA
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= corr_MergerAndAcquisitionCompanyAnalysisMember
|
| Merger and Acquisition Company Analysis [Member] | Maximum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| EV/LTM 2012 EBITDA |
9.3corr_FairValueAssumptionsEVLTMEBITDA
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= corr_MergerAndAcquisitionCompanyAnalysisMember
|
| Merger and Acquisition Company Analysis [Member] | Weighted Average [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| EV/LTM 2012 EBITDA |
8.8corr_FairValueAssumptionsEVLTMEBITDA
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= corr_MergerAndAcquisitionCompanyAnalysisMember
|
| Discounted Cash Flow [Member] | Minimum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Weighted Average Cost of Capital |
950.00%corr_FairValueAssumptionsWeightedAverageCostofCapital
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= corr_DiscountedCashFlowMember
|
| Discounted Cash Flow [Member] | Maximum [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Weighted Average Cost of Capital |
14.00%corr_FairValueAssumptionsWeightedAverageCostofCapital
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= corr_DiscountedCashFlowMember
|
| Discounted Cash Flow [Member] | Weighted Average [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Weighted Average Cost of Capital |
11.80%corr_FairValueAssumptionsWeightedAverageCostofCapital
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= corr_DiscountedCashFlowMember
|
| Equity Securities [Member] | Public Company Historical EBITDA Multiples [Member] |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
| Other equity securities, at fair value |
24,107,243us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_ValuationTechniqueAxis
= corr_PublicCompanyHistoricalEbitdaMultiplesMember
|