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Business (Narratives) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
property
sqft
tenant
Sep. 30, 2014
Dec. 31, 2013
Additional disclosures      
Shares issued in public offering   4,600,000us-gaap_SharesIssued  
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Share price   $ 64.00us-gaap_SharePrice  
Number of real estate properties 783us-gaap_NumberOfRealEstateProperties    
Number of tenants 219wpc_NumberOfTenants    
Square footage of real estate properties 87,300,000us-gaap_AreaOfRealEstateProperty    
Occupancy rate 98.60%wpc_OccupancyRate    
Managed REITs | Operating real estate      
Additional disclosures      
Number of operating properties 115wpc_NumberOfOperatingProperties
/ us-gaap_RealEstatePropertiesAxis
= wpc_OperatingRealEstateBusinessMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_ManagedReitsMember		    
Square footage of operating properties 12,800,000wpc_SquareFootageOfOperatingProperties
/ us-gaap_RealEstatePropertiesAxis
= wpc_OperatingRealEstateBusinessMember
/ us-gaap_RelatedPartyTransactionAxis
= wpc_ManagedReitsMember		    
CPA REITs      
Additional disclosures      
Number of real estate properties 404us-gaap_NumberOfRealEstateProperties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPAReitsMember		    
Number of tenants 180wpc_NumberOfTenants
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPAReitsMember		    
Square footage of real estate properties 43,000,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPAReitsMember		    
Occupancy rate 99.80%wpc_OccupancyRate
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPAReitsMember