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Agreements and Transactions with Related Parties (Narratives) (Details) (USD $)
 12 Months Ended 28 Months Ended 0 Months Ended 3 Months Ended 11 Months Ended 0 Months Ended
Dec. 31, 2014
property
Dec. 31, 2013
Dec. 31, 2014
property
Dec. 31, 2014
property
Aug. 20, 2013
Sep. 30, 2014
Dec. 31, 2014
Oct. 31, 2014
Dec. 18, 2013
property
Mar. 31, 2014
Aug. 20, 2013
May 07, 2013
Aug. 20, 2014
Related Party Transaction [Line Items]                          
Aggregate gross proceeds from offering threshold ( percentage) 1.50%cpa18_AggregateGrossProceedsFromOfferingThreshold   1.50%cpa18_AggregateGrossProceedsFromOfferingThreshold 1.50%cpa18_AggregateGrossProceedsFromOfferingThreshold     1.50%cpa18_AggregateGrossProceedsFromOfferingThreshold            
Organizational costs incurred       $ 100,000cpa18_OrganizationalCosts                  
Offering costs 2,993,000cpa18_OfferingCostsIncurred 5,050,000cpa18_OfferingCostsIncurred   8,000,000cpa18_OfferingCostsIncurred                  
Reimbursed offering costs 7,900,000cpa18_ReimbursedOfferingCosts   7,900,000cpa18_ReimbursedOfferingCosts 7,900,000cpa18_ReimbursedOfferingCosts     7,900,000cpa18_ReimbursedOfferingCosts            
Deferred offering cost charged to equity     6,100,000cpa18_DeferredOfferingCostChargedToEquity                    
Line of Credit                          
Ownership interest in jointly-owned investment         50.00%cpa18_OwnershipInterestInJointVenture           50.00%cpa18_OwnershipInterestInJointVenture    
Due to Related Party                          
Shareholder servicing fee 814,000cpa18_ShareholderServicingFeeIncurred 46,000cpa18_ShareholderServicingFeeIncurred                      
Excess operating expense charge back 0cpa18_OperationsCostChargeBack 69,000cpa18_OperationsCostChargeBack                      
Available cash distribution 1,778,000cpa18_DistributionsOfAvailableCash 92,000cpa18_DistributionsOfAvailableCash                      
Preferred Return 5.00%cpa18_PreferredReturn                        
Stock-based compensation, value 100,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 67,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation                      
Investment in real estate 865,517,000us-gaap_RealEstateInvestmentPropertyNet 149,600,000us-gaap_RealEstateInvestmentPropertyNet 865,517,000us-gaap_RealEstateInvestmentPropertyNet 865,517,000us-gaap_RealEstateInvestmentPropertyNet     865,517,000us-gaap_RealEstateInvestmentPropertyNet            
Number of properties acquired 54cpa18_NumberOfPropertiesAcquired   54cpa18_NumberOfPropertiesAcquired 54cpa18_NumberOfPropertiesAcquired     54cpa18_NumberOfPropertiesAcquired            
Contract sales price of investment                          
Due to Related Party                          
Percentage of subordinated disposition fees 3.00%cpa18_PercentageOfSubordinatedDispositionFees
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_ContractSalesPriceOfInvestmentMember		                        
Adjusted net income                          
Due to Related Party                          
Percentage of operating expense reimbursement 25.00%cpa18_PercentageOfOperatingExpensesReimbursements
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_AdjustedNetIncomeMember		                        
Average invested asset                          
Due to Related Party                          
Percentage of operating expense reimbursement 2.00%cpa18_PercentageOfOperatingExpensesReimbursements
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_AverageInvestedAssetsMember		                        
Real estate commission                          
Due to Related Party                          
Percentage of subordinated disposition fees 50.00%cpa18_PercentageOfSubordinatedDispositionFees
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_RealEstateCommissionMember		                        
Current                          
Due to Related Party                          
Percentage of acquisition fees 2.50%cpa18_PercentageOfAcquisitionFees
/ cpa18_SettlementTermAxis
= cpa18_CurrentMember		                        
Deferred                          
Due to Related Party                          
Percentage of acquisition fees 2.00%cpa18_PercentageOfAcquisitionFees
/ cpa18_SettlementTermAxis
= cpa18_DeferredMember		                        
W.P. Carey                          
Line of Credit                          
Maximum line of credit approved by directors 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_W.P.CareyMember		   100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_W.P.CareyMember		 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_W.P.CareyMember		     100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_W.P.CareyMember		            
CPA 18 Operating Partnership                          
Line of Credit                          
Related party notes payable         15,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_CorporatePropertyAssociatesEighteenOperatingPartnerMember		           15,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_CorporatePropertyAssociatesEighteenOperatingPartnerMember		    
Maturity date         Aug. 20, 2014                
Class A common stock                          
Line of Credit                          
Common Stock Initial Public Offering Par Or Stated Value Per Share                       $ 10cpa18_CommonStockInitialPublicOfferingParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Number of shares held by advisor 99,924,009us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 21,290,097us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 99,924,009us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 99,924,009us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		     99,924,009us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		            
Due to Related Party                          
Selling commission per share sold                       $ 0.7cpa18_SellingCommissionPerShareSold
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Dealer manager fee per share sold                       $ 0.3cpa18_DealerManagerFeePerShareSold
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Stock-based compensation, shares           1,851us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		              
Market value of stock           $ 9.00cpa18_MarketValueOfStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		              
Class A common stock | Advisor                          
Line of Credit                          
Number of shares held by advisor 260,511.737us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   260,511.737us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 260,511.737us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		     260,511.737us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		            
Advisor owned percentage of common stock 0.20%cpa18_AdvisorOwnedPercentageOfCommonStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   0.20%cpa18_AdvisorOwnedPercentageOfCommonStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0.20%cpa18_AdvisorOwnedPercentageOfCommonStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		     0.20%cpa18_AdvisorOwnedPercentageOfCommonStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_AdvisorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		            
Class C common stock                          
Line of Credit                          
Common Stock Initial Public Offering Par Or Stated Value Per Share                       $ 9.35cpa18_CommonStockInitialPublicOfferingParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		  
Number of shares held by advisor 18,026,013us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 2,776,001us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 18,026,013us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 18,026,013us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		     18,026,013us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		            
Due to Related Party                          
Selling commission per share sold                       $ 0.14cpa18_SellingCommissionPerShareSold
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		  
Dealer manager fee per share sold                       $ 0.21cpa18_DealerManagerFeePerShareSold
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		  
Shareholder servicing fee 1.00%cpa18_ShareholderServicingFee
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		   1.00%cpa18_ShareholderServicingFee
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 1.00%cpa18_ShareholderServicingFee
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		     1.00%cpa18_ShareholderServicingFee
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		            
Minimum | Average market value of investment                          
Line of Credit                          
Percentage of asset management fees 0.50%cpa18_PercentageOfAssetManagementFees
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_AverageMarketValueOfInvestmentMember		                        
Maximum                          
Due to Related Party                          
Percentage of acquisition fees 6.00%cpa18_PercentageOfAcquisitionFees
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                        
Maximum | Average equity value of investment                          
Line of Credit                          
Percentage of asset management fees 1.50%cpa18_PercentageOfAssetManagementFees
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ cpa18_RelatedPartyFeesBasisAxis
= cpa18_AverageEquityValueOfInvestmentMember		                        
Maximum | Cpa 18 Holdings                          
Due to Related Party                          
Shareholder servicing fee payment threshold 10.00%cpa18_PercentageOfDistributionsForSpecialGeneralPartner
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cpa18_Cpa18HoldingsMember		                        
Business Combinations                          
Due to Related Party                          
Total identifiable net assets acquired in business combination 713,391,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		   713,391,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		 713,391,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		     713,391,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		            
Investment purchase price             650,479,000cpa18_InvestmentPurchasePrice
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		            
Real Estate                          
Due to Related Party                          
Investment in real estate 732,860,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		 149,600,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		 732,860,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		 732,860,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		     732,860,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		            
Investment purchase price 152,200,000cpa18_InvestmentPurchasePrice
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		 212,600,000cpa18_InvestmentPurchasePrice
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		                      
Number of properties acquired 12cpa18_NumberOfPropertiesAcquired
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		   12cpa18_NumberOfPropertiesAcquired
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		 12cpa18_NumberOfPropertiesAcquired
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		     12cpa18_NumberOfPropertiesAcquired
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		            
Apply                          
Line of Credit                          
Maturity date               Oct. 31, 2021          
Apply | Real Estate                          
Line of Credit                          
Ownership interest in jointly-owned investment               51.00%cpa18_OwnershipInterestInJointVenture
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		          
Due to Related Party                          
Investment in real estate               108,300,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		          
Investment purchase price               55,200,000cpa18_InvestmentPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cpa18_ApplyASMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		          
Agrokor d.d. | Real Estate                          
Line of Credit                          
Ownership interest in jointly-owned investment                 80.00%cpa18_OwnershipInterestInJointVenture
/ us-gaap_BusinessAcquisitionAxis
= cpa18_Agrokord.d.Member
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		        
Net Assets                 97,000,000us-gaap_AssetsNet
/ us-gaap_BusinessAcquisitionAxis
= cpa18_Agrokord.d.Member
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		        
Due to Related Party                          
Investment purchase price                 77,600,000cpa18_InvestmentPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cpa18_Agrokord.d.Member
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		        
Number of properties acquired                 5cpa18_NumberOfPropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= cpa18_Agrokord.d.Member
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		        
Bank Pekao | Business Combinations                          
Line of Credit                          
Ownership interest in jointly-owned investment                   50.00%cpa18_OwnershipInterestInJointVenture
/ us-gaap_BusinessAcquisitionAxis
= cpa18_BankPekaoMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		      
Due to Related Party                          
Total identifiable net assets acquired in business combination                   147,904,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cpa18_BankPekaoMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		      
Investment purchase price                   73,952,000cpa18_InvestmentPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cpa18_BankPekaoMember
/ us-gaap_RealEstatePropertiesAxis
= cpa18_BusinessCombinationsMember		      
State Farm | Real Estate                          
Line of Credit                          
Ownership interest in jointly-owned investment         50.00%cpa18_OwnershipInterestInJointVenture
/ us-gaap_BusinessAcquisitionAxis
= cpa18_StateFarmMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		           50.00%cpa18_OwnershipInterestInJointVenture
/ us-gaap_BusinessAcquisitionAxis
= cpa18_StateFarmMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember		    
Net Assets                         115,600,000us-gaap_AssetsNet
/ us-gaap_BusinessAcquisitionAxis
= cpa18_StateFarmMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember
Due to Related Party                          
Investment purchase price                     $ 57,800,000cpa18_InvestmentPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cpa18_StateFarmMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_RealEstateMember