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Debt (Narratives) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2014
Feb. 27, 2014
Dec. 11, 2014
Oct. 09, 2014
Jan. 23, 2014
Debt Instrument [Line Items]              
Foreign currency translation adjustments $ (29,602,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax $ 156,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax          
Debt Instruments              
Non-recourse debt 613,900,000us-gaap_NonRecourseDebt 119,300,000us-gaap_NonRecourseDebt          
Bond payable 91,250,000us-gaap_NotesPayable 0us-gaap_NotesPayable          
Deferred financing costs, capitalized 4,700,000cpa18_CapitalizedFinancingCost            
Non-recourse debt and bond payable              
Debt Instrument [Line Items]              
Foreign currency translation adjustments (28,800,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LongTermDebtMember
           
Apply AS              
Debt Instruments              
Bond payable 48,200,000us-gaap_NotesPayable
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
  53,300,000us-gaap_NotesPayable
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
       
Debt instrument stated interest rate     4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
       
Maturity date     Oct. 31, 2021        
Siemens AS              
Debt Instrument [Line Items]              
Foreign currency translation adjustments 700,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SiemensASMember
           
Debt Instruments              
Bond payable 43,100,000us-gaap_NotesPayable
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SiemensASMember
    52,100,000us-gaap_NotesPayable
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SiemensASMember
     
Debt instrument stated interest rate       3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SiemensASMember
     
Maturity date       Dec. 15, 2025      
Business Combinations              
Debt Instruments              
Mortgage assumed, business combination 33,758,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember
      11,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember
   
Business Combinations | Self Storage              
Debt Instruments              
Mortgage assumed, business combination           23,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SelfStorageMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember
14,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SelfStorageMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember
Business Combinations | Siemens AS              
Debt Instruments              
Mortgage assumed, business combination       $ 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= cpa18_SiemensASMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember