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Agreements and Transactions with Related Parties (Narratives) (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Apr. 04, 2013
Oct. 09, 2012
Aug. 02, 2012
Feb. 28, 2014
Dec. 31, 2014
property
Dec. 31, 2013
Dec. 31, 2012
Jun. 25, 2014
Nov. 30, 2013
officer
Mar. 31, 2012
Jan. 31, 2013
Aug. 20, 2013
Sep. 30, 2013
Structuring revenue                          
Installment period for deferred acquisition fee receivable         three years                
Subordinated incentive revenue         15.00%wpc_SubordinatedIncentiveRevenue                
Distributions Of Available Cash and Deferred Revenue Earned                          
Percentage of Available Cash distribution to advisor         10.00%wpc_PercentageOfAvailableCashDistributionToAdvisor                
Share Purchase Agreement                          
Repurchase of common stock $ 40,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 20,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 25,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 700,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 679,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 40,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 45,270,000us-gaap_PaymentsForRepurchaseOfCommonStock            
Stock repurchased during period, shares 616,971us-gaap_StockRepurchasedDuringPeriodShares 410,964us-gaap_StockRepurchasedDuringPeriodShares 561,418us-gaap_StockRepurchasedDuringPeriodShares 11,037us-gaap_StockRepurchasedDuringPeriodShares                  
Common stock market value on excerise date $ 64.83wpc_CommonStockShareValueonExerciseDate $ 48.67wpc_CommonStockShareValueonExerciseDate $ 44.53wpc_CommonStockShareValueonExerciseDate                    
Redemption value adjustment         0us-gaap_ReclassificationsOfTemporaryToPermanentEquity 0us-gaap_ReclassificationsOfTemporaryToPermanentEquity 85,000,000us-gaap_ReclassificationsOfTemporaryToPermanentEquity            
Redemption of securities         0wpc_RedemptionOfRedeemableSecurities 40,000,000wpc_RedemptionOfRedeemableSecurities 45,000,000wpc_RedemptionOfRedeemableSecurities            
Number of real estate properties         783us-gaap_NumberOfRealEstateProperties                
Long-term net lease                          
Structuring revenue                          
Percentage of acquisition fees earned         4.50%wpc_PercentageOfAcquisitionFeesEarned
/ invest_InvestmentAxis
= wpc_LongtermnetleaseMember		                
Long-term net lease | Current                          
Structuring revenue                          
Percentage of acquisition fees earned         2.50%wpc_PercentageOfAcquisitionFeesEarned
/ invest_InvestmentAxis
= wpc_LongtermnetleaseMember
/ wpc_SettlementTermAxis
= wpc_CurrentMember		                
Long-term net lease | Deferred                          
Structuring revenue                          
Percentage of acquisition fees earned         2.00%wpc_PercentageOfAcquisitionFeesEarned
/ invest_InvestmentAxis
= wpc_LongtermnetleaseMember
/ wpc_SettlementTermAxis
= wpc_DeferredMember		                
Maximum                          
Structuring revenue                          
Unpaid transaction fee interest rate         5.00%wpc_UnpaidTransactionFeeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                
Subordinated disposition revenue         3.00%wpc_SubordinatedDispositionRevenue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                
Share Purchase Agreement                          
Ownership interest in joint ventures         90.00%wpc_OwnershipInterestInJointVentures
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                
Maximum | Contract sales price of investment                          
Structuring revenue                          
Percentage of acquisition fees earned         6.00%wpc_PercentageOfAcquisitionFeesEarned
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ wpc_RelatedPartyFeesBasisAxis
= wpc_ContractSalesPriceOfInvestmentMember		                
Minimum                          
Structuring revenue                          
Unpaid transaction fee interest rate         2.00%wpc_UnpaidTransactionFeeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                
Share Purchase Agreement                          
Ownership interest in joint ventures         3.00%wpc_OwnershipInterestInJointVentures
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                
CPA: 15 - Global | Average invested assets                          
Revenue from related parties                          
Percentage of asset management fees earned         1.00%wpc_PercentageOfAssetManagementFeesEearned
/ wpc_RelatedPartyFeesBasisAxis
= wpc_AverageInvestedAssetsMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa15Member		                
CPA: 15 - Global | Deferred | Average invested assets                          
Revenue from related parties                          
Percentage of asset management fees earned         0.50%wpc_PercentageOfAssetManagementFeesEearned
/ wpc_RelatedPartyFeesBasisAxis
= wpc_AverageInvestedAssetsMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa15Member
/ wpc_SettlementTermAxis
= wpc_DeferredMember		                
CPA: 16 - Global                          
Revenue from related parties                          
Asset management revenue receivable in shares, percent         50.00%wpc_AssetManagementFeesReceivableInSharesPercentOfTotal
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member		                
Asset management revenue receivable in cash, percent         50.00%wpc_AssetManagementFeesReceivableInCashPercentOfTotal
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member		                
Reimbursed costs from affiliates and wholesaling revenue                          
Commission Rate             5.00%wpc_CommissionRate
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member		            
DRIP rate                   95.00%wpc_DRIPrate
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member		      
CPA: 16 - Global | Average invested assets                          
Revenue from related parties                          
Percentage of asset management fees earned         0.50%wpc_PercentageOfAssetManagementFeesEearned
/ wpc_RelatedPartyFeesBasisAxis
= wpc_AverageInvestedAssetsMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member		                
CPA: 17 - Global                          
Reimbursed costs from affiliates and wholesaling revenue                          
Selling commission per share sold                     $ 0.65wpc_SellingCommissionPerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		    
Dealer manager fee per share sold                     $ 0.35wpc_DealerManagerFeePerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		    
CPA: 17 - Global | Maximum                          
Revenue from related parties                          
Percentage of asset management fees earned         1.75%wpc_PercentageOfAssetManagementFeesEearned
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		                
CPA: 17 - Global | Maximum | Average equity value                          
Structuring revenue                          
Percentage of acquisition fees earned         1.75%wpc_PercentageOfAcquisitionFeesEarned
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ wpc_RelatedPartyFeesBasisAxis
= wpc_AverageEquityValueMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		                
CPA: 17 - Global | Minimum                          
Revenue from related parties                          
Percentage of asset management fees earned         0.50%wpc_PercentageOfAssetManagementFeesEearned
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		                
CPA: 17 - Global | Minimum | Average equity value                          
Structuring revenue                          
Percentage of acquisition fees earned         0.00%wpc_PercentageOfAcquisitionFeesEarned
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ wpc_RelatedPartyFeesBasisAxis
= wpc_AverageEquityValueMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member		                
CPA:18 - Global                          
Reimbursed costs from affiliates and wholesaling revenue                          
Organization and offering costs incurred         8,100,000us-gaap_NoninterestExpenseOfferingCost
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
Reimbursed offering costs         7,900,000wpc_ReimbursedOfferingCosts
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
Aggregate gross proceeds threshold         1.50%wpc_AggregateGrossProceedsFromOfferingThreshold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
Share Purchase Agreement                          
Line of credit, maximum borrowing amount         100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
Loans and leases receivable, from related party                       15,000,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		  
CPA:18 - Global | Class A                          
Reimbursed costs from affiliates and wholesaling revenue                          
Selling commission per share sold         $ 0.7wpc_SellingCommissionPerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                
Dealer manager fee per share sold         $ 0.3wpc_DealerManagerFeePerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                
CPA:18 - Global | Class C                          
Reimbursed costs from affiliates and wholesaling revenue                          
Selling commission per share sold         $ 0.14wpc_SellingCommissionPerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		                
Dealer manager fee per share sold         $ 0.21wpc_DealerManagerFeePerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		                
Shareholder servicing, percentage         1.00%wpc_ShareholderServicingFee
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		                
Underwriting compensation limit, percentage         10.00%wpc_UnderwritingCompensationLimit
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		                
CPA:18 - Global | Maximum                          
Revenue from related parties                          
Percentage of asset management fees earned         1.50%wpc_PercentageOfAssetManagementFeesEearned
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
CPA:18 - Global | Minimum                          
Revenue from related parties                          
Percentage of asset management fees earned         0.50%wpc_PercentageOfAssetManagementFeesEearned
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember		                
CWI                          
Structuring revenue                          
Percentage of loan refinancing fee         1.00%wpc_PercentageOfLoanRefinancingFee
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Reimbursed costs from affiliates and wholesaling revenue                          
Selling commission per share sold         $ 0.70wpc_SellingCommissionPerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		               $ 0.7wpc_SellingCommissionPerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember
Dealer manager fee per share sold         $ 0.30wpc_DealerManagerFeePerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		               $ 0.3wpc_DealerManagerFeePerShareSold
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember
Maximum percent of offering proceeds         2.00%wpc_MaximumPercentageOfOfferingProceeds
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Maximum percentage of follow-on offering proceeds         4.00%wpc_MaximumPercentageOfFollowonOfferingProceeds
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Organization and offering costs incurred         12,800,000us-gaap_NoninterestExpenseOfferingCost
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Reimbursed offering costs         12,500,000wpc_ReimbursedOfferingCosts
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Share Purchase Agreement                          
Line of credit, maximum borrowing amount           75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		              
Debt instrument, description of variable rate basis               LIBOR plus 1.1%          
Debt instrument, basis spread on variable rate               1.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		          
Loans and leases receivable, from related party               11,000,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		          
Receivable Maturity Date               Jun. 30, 2015          
CWI | Contract sales price of investment                          
Structuring revenue                          
Percentage of acquisition fees earned         2.50%wpc_PercentageOfAcquisitionFeesEarned
/ wpc_RelatedPartyFeesBasisAxis
= wpc_ContractSalesPriceOfInvestmentMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
CWI | Lodging-related investments                          
Revenue from related parties                          
Percentage of asset management fees earned         0.50%wpc_PercentageOfAssetManagementFeesEearned
/ invest_InvestmentAxis
= wpc_LodgingrelatedinvestmentsMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember		                
Options One                          
Share Purchase Agreement                          
Registration rights agreement         50,000,000wpc_RegistrationRightsAgreementValue
/ wpc_RegistrationAgreementOptionsAxis
= wpc_RegistrationAgreementOptionsOneMember		                
Options Two                          
Share Purchase Agreement                          
Registration rights agreement         75,000,000wpc_RegistrationRightsAgreementValue
/ wpc_RegistrationAgreementOptionsAxis
= wpc_RegistrationAgreementOptionsTwoMember		                
Self-storage                          
Share Purchase Agreement                          
Number of officers                 2wpc_NumberofOfficers
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= wpc_SelfStorageMember		        
Distribution to noncontrolling interest holders                 $ 3,800,000us-gaap_PaymentsToMinorityShareholders
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= wpc_SelfStorageMember