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Investment And Other Gains Investment and other gains (Details) $ in Thousands	12 Months Ended
	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

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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