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Intangibles (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Remaining weighted average amortization period 19 years 10 months 24 days 19 years 9 months 18 days  
Intangible assets:      
Goodwill and other intangibles $ 489,384,000vtr_GoodwillAndOtherFiniteLivedIntangibleAssetsGross $ 489,346,000vtr_GoodwillAndOtherFiniteLivedIntangibleAssetsGross  
Accumulated amortization (549,026,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (458,919,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Net intangible assets 980,009,000us-gaap_IntangibleAssetsNetIncludingGoodwill 1,040,609,000us-gaap_IntangibleAssetsNetIncludingGoodwill  
Intangible liabilities:      
Below market lease intangibles 425,092,000us-gaap_BelowMarketLeaseGross 429,199,000us-gaap_BelowMarketLeaseGross  
Other lease intangibles 32,103,000vtr_OtherFiniteLivedIntangibleLiabilitiesGross 32,103,000vtr_OtherFiniteLivedIntangibleLiabilitiesGross  
Accumulated amortization (158,480,000)vtr_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization (119,549,000)vtr_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization  
Purchase option intangibles 22,900,000vtr_IndefiniteLivedIntangibleLiabilitiesPurchaseOptions 29,294,000vtr_IndefiniteLivedIntangibleLiabilitiesPurchaseOptions  
Net intangible liabilities 321,615,000vtr_FiniteLivedIntangibleLiabilitiesNet 371,047,000vtr_FiniteLivedIntangibleLiabilitiesNet  
Below market leases, remaining weighted average amortization period 14 years 8 months 12 days 14 years 8 months 12 days  
Other lease intangibles, remaining weighted average amortization period 26 years 1 month 6 days 24 years 9 months 18 days  
Finite-lived intangible liabilities, remaining weighted average amortization period 15 years 2 months 12 days 15 years 1 month 6 days  
Intangibles      
Net amortization expense 51,200,000vtr_FiniteLivedIntangibleAssetsLiabilitiesNetAmortizationExpense 65,200,000vtr_FiniteLivedIntangibleAssetsLiabilitiesNetAmortizationExpense 123,300,000vtr_FiniteLivedIntangibleAssetsLiabilitiesNetAmortizationExpense
Estimated net amortization of the intangibles during 2015 58,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Estimated net amortization of the intangibles during 2016 29,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Estimated net amortization of the intangibles during 2017 16,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Estimated net amortization of the intangibles during 2018 10,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Estimated net amortization of the intangibles during 2019 5,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
In-place and other lease intangibles      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 829,078,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= vtr_LeasesAcquiredInPlaceAndOtherLeaseIntangiblesMember		 795,829,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= vtr_LeasesAcquiredInPlaceAndOtherLeaseIntangiblesMember		  
Remaining weighted average amortization period 23 years 10 months 24 days 24 years 1 month 6 days  
Above market lease intangibles      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 210,573,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember		 $ 214,353,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember		  
Remaining weighted average amortization period 8 years 2 months 12 days 8 years 4 months 24 days  
Other intangibles      
Finite-Lived Intangible Assets [Line Items]      
Remaining weighted average amortization period 7 years 10 months 24 days 8 years 7 months 6 days