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Real Estate (Summary of NHC Percentage Rent) (Details) (National Healthcare Corporation [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Total percentage rent $ 690us-gaap_PercentageRent $ 581us-gaap_PercentageRent
Current year [Member]    
Total percentage rent 596us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 566us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember
Prior year final certification [Member]    
Total percentage rent $ 94us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember		 $ 15us-gaap_PercentageRent
/ invest_InvestmentAxis
= nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
/ us-gaap_MajorCustomersAxis
= nhi_NationalHealthcareCorporationMember