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Real Estate (Summary of NHC Percentage Rent) (Details) (National Healthcare Corporation [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total percentage rent $ 2,307us-gaap_PercentageRent $ 3,021us-gaap_PercentageRent $ 2,527us-gaap_PercentageRent
Current year [Member]      
Total percentage rent 2,292us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 2,275us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 1,530us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember
Prior year final certification [Member]      
Total percentage rent $ 15us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 $ 746us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 $ 997us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember