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Investments in Unconsolidated Entities (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments in Unconsolidated Joint Ventures Textuals [Line Items]      
Percentage of partnership owned   20.00%us-gaap_InvestmentOwnedPercentOfNetAssets  
Equity investments $ 744,151,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 479,629,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures  
Income from unconsolidated entities (27,426,000)us-gaap_IncomeLossFromEquityMethodInvestments (8,187,000)us-gaap_IncomeLossFromEquityMethodInvestments 2,482,000us-gaap_IncomeLossFromEquityMethodInvestments
Unamortized Investment related to Appreciation Of Underlying Properties And Transaction Cost 175,369,000hcn_Unamortizedinvestmentinjointventureprimarilyattributabletoappreciationofunderlyingpropertiesandtransactioncost    
Senior Housing Facilities Triple Net [Member]      
Investments in Unconsolidated Joint Ventures Textuals [Line Items]      
Income from unconsolidated entities 5,423,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_SeniorHousingFacilitiesTripleNetMember
5,035,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_SeniorHousingFacilitiesTripleNetMember
(33,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_SeniorHousingFacilitiesTripleNetMember
Medical Facilities [Member]      
Investments in Unconsolidated Joint Ventures Textuals [Line Items]      
Income from unconsolidated entities $ 5,355,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_MedicalFacilitiesMember
$ 9,473,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_MedicalFacilitiesMember
$ 8,879,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hcn_MedicalFacilitiesMember