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Significant Accounting Policies Significant Accounting Policies (Details) | Mar. 31, 2018
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Accounting Policies [Abstract] |
Variable Interest Entity Number Of Entities Not Primary Beneficiary | 8

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- Definition Number of Variable Interest Entities (VIE) or potential VIEs for which it is determined that the reporting entity is not the primary beneficiary. + References No definition available. + Details
Name: | nhi_VariableInterestEntityNumberOfEntitiesNotPrimaryBeneficiary
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration