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Commitments And Contingencies (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) properties | Dec. 31, 2018 USD ($)
Document Period End Date | Jun. 30, 2019 |
Unamortized lease incentive payments | $ 9,673,000 | $ 7,456,000
Bickford Development Properties [Member] |  |
Number Of Development Projects Active | properties | 5 |
Developer Incentive Payments | $ 250,000 |
Unamortized lease incentive payments | $ 1,750,000 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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Namespace Prefix: | dei_
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Balance Type: | na
Period Type: | duration

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- Definition This item represents contingent payments to developers which are an incentive to complete a construction project within the scheduled project time frame. + References No definition available. + Details
Name: | nhi_DeveloperIncentivePayments
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents the number of active development or construction projects. + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40019-112707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40010-112707 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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