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Investment In Preferred Stock, At Cost (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investment income and other $ 1,135,000us-gaap_InvestmentIncomeNet $ 1,067,000us-gaap_InvestmentIncomeNet
Investment in cumulative preferred stock of LTC properties 2,000,000nhi_InvestmentInCumulativePreferredStock  
Original cost of cost method investments 38,132,000nhi_OriginalCostOfCostMethodInvestments  
Nonvoting Convertible Preferred Stock 2,000,000nhi_NonvotingConvertiblePreferredStock  
Closing Price Of LTC's Common Stock $ 46.00nhi_ClosingPriceOfLTCsCommonStock  
Preferred Stock, Dividend Rate, Percentage 8.50%us-gaap_PreferredStockDividendRatePercentage  
Preferred Stock, Liquidation Preference Per Share $ 19.25us-gaap_PreferredStockLiquidationPreference  
Preferred Dividends [Member]    
Investment income and other $ 818,000us-gaap_InvestmentIncomeNet
/ us-gaap_InvestmentTypeAxis
= nhi_PreferredDividendsMember
$ 818,000us-gaap_InvestmentIncomeNet
/ us-gaap_InvestmentTypeAxis
= nhi_PreferredDividendsMember