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Real Property Acquisitions and Development (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Development projects:    
Total development projects $ 16,592,000hcn_DevelopmentProjectsPlacedIntoService $ 51,280,000hcn_DevelopmentProjectsPlacedIntoService
Expansion projects 19,541,000hcn_ExpansionProjects 9,209,000hcn_ExpansionProjects
Total construction in progress conversions 36,133,000hcn_ConstructionInProgressConversions 60,489,000hcn_ConstructionInProgressConversions
Outpatient Medical [Member]    
Development projects:    
Total development projects 16,592,000hcn_DevelopmentProjectsPlacedIntoService
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_OutpatientMedicalMember		 42,799,000hcn_DevelopmentProjectsPlacedIntoService
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_OutpatientMedicalMember
Triple Net [Member]    
Development projects:    
Total development projects $ 0hcn_DevelopmentProjectsPlacedIntoService
/ hcn_RealPropertyInvestmentAxis
= hcn_TripleNetMember		 $ 8,481,000hcn_DevelopmentProjectsPlacedIntoService
/ hcn_RealPropertyInvestmentAxis
= hcn_TripleNetMember