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Investment And Other Gains Investment and other gains (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Investment And Other Gains [Abstract] |
Dividend Income On Marketable Securities | $ 1,697

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- Definition This item represents dividend income on marketable securities. + References No definition available. + Details
Name: | nhi_DividendIncomeOnMarketableSecurities
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Investment And Other Gains [Abstract] + References No definition available. + Details
Name: | nhi_InvestmentAndOtherGainsAbstract
Namespace Prefix: | nhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration