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v3.19.1

Significant Accounting Policies Significant Accounting Policies (Details) | 3 Months Ended
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Mar. 31, 2019 properties
Lessor, Lease, Description [Line Items] |
Lessor, Operating Lease, Renewal Term | 5 years
Variable Interest Entity Number Of Entities Not Primary Beneficiary | 6
Minimum [Member] |
Lessor, Lease, Description [Line Items] |
Lessor, Operating Lease, Term of Contract | 10 years
Maximum [Member] |
Lessor, Lease, Description [Line Items] |
Lessor, Operating Lease, Term of Contract | 15 years
Variable Lease Escalation [Member] |
Lessor, Lease, Description [Line Items] |
Percentage of Continuing Revenue | 21.00%

X
- Definition This element represents the percentage of income recognized from a lease tenant. + References No definition available. + Details
Name: | nhi_PercentageOfContinuingRevenue
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=nhi_VariableLeaseEscalationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |