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Agreements and Transactions with Related Parties (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction      
Revenue from related parties $ 295,492us-gaap_RevenueFromRelatedParties $ 217,377us-gaap_RevenueFromRelatedParties $ 262,048us-gaap_RevenueFromRelatedParties
CPA: 15 - Global      
Related Party Transaction      
Revenue from related parties 0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa15Member
0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa15Member
21,593us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa15Member
CPA: 16 - Global      
Related Party Transaction      
Revenue from related parties 7,999us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member
53,166us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member
50,929us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_Cpa16Member
CPA: 17 - Global      
Related Party Transaction      
Revenue from related parties 68,710us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member
69,275us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member
174,192us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CPA17Member
CPA:18 - Global      
Related Party Transaction      
Revenue from related parties 129,642us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
29,293us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CorporatePropertyAssociatesEighteenMember
CWI      
Related Party Transaction      
Revenue from related parties $ 89,141us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember
$ 65,643us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember
$ 15,334us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= wpc_CwiMember