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Limits On Common Stock Ownership Limits On Common Stock Ownership (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Limits On Common Stock Ownership [Abstract] |
Maximum Number of Equity Owners, Closely Held Designation | 100
Common Stock Ownership Limit | 9.90%
Excepted Holder Agreement, Common Stock, Ownership Limit | 7.50%

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- Definition This item represents the maximum amount of the Company's common stock any individual shareholder is allowed to own represented as a percentage of the total number of shares outstanding as provided by certain provisions of the Company's charter. + References No definition available. + Details
Name: | nhi_CommonStockOwnershipLimit
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the maximum amount of the Company's common stock any individual shareholder is allowed to own as a result of the Excepted Holder Agreements which became effective May 12, 2008 represented as a percentage of the total number of shares outstanding as provided by certain provisions of the Company's charter. + References No definition available. + Details
Name: | nhi_ExceptedHolderAgreementCommonStockOwnershipLimit
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Limits On Common Stock Ownership [Abstract] + References No definition available. + Details
Name: | nhi_LimitsOnCommonStockOwnershipAbstract
Namespace Prefix: | nhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the maximum number of equity owners that can own a designated maximum percentage of the company's outstanding stock before a designation as closely held will prevent qualification as a REIT. + References No definition available. + Details
Name: | nhi_MaximumNumberofEquityOwnersCloselyHeldDesignation
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant