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Subsequent Events Subsequent Events (Narrative) (Details) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 07, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 03, 2017
Subsequent Event [Line Items] |  |  |  |
Remaining Unfunded Development Commitment |  | $ 57,299,000 |  |
Payments to Acquire Real Estate |  | $ 133,251,000 | $ 288,965,000 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Remaining Unfunded Development Commitment |  |  |  | $ 7,100,000
Capital Improvements Commitment Funded | $ 0 |  |  |

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- Definition Capital Improvements Commitment Funded + References No definition available. + Details
Name: | nhi_CapitalImprovementsCommitmentFunded
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents the remaining unfunded development commitment related to a lease property. + References No definition available. + Details
Name: | nhi_RemainingUnfundedDevelopmentCommitment
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |