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Commitments And Contingencies Commitments and Contingencies (Schedule of Lease Commitments) (Details) | Mar. 31, 2019 USD ($)
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Maximum Commitment For All Active Development Projects | $ 45,630,000
Development in Process | (21,749,000)
Remaining Unfunded Development Commitment | 23,881,000
Senior Living Communities [Member] |
Capital Improvements Commitment | 3,100,000
Capital Improvement Commitment [Member] | Bickford Senior Living [Member] |
Maximum Commitment For All Active Development Projects | 1,750,000
Development in Process | (1,750,000)
Remaining Unfunded Development Commitment | 0
Capital Improvement Commitment [Member] | Senior Living Communities [Member] |
Maximum Commitment For All Active Development Projects | 6,830,000
Development in Process | (5,808,000)
Remaining Unfunded Development Commitment | 1,022,000
Capital Improvement Commitment [Member] | Discovery Senior Living [Member] |
Maximum Commitment For All Active Development Projects | 500,000
Development in Process | (302,000)
Remaining Unfunded Development Commitment | 198,000
Capital Improvement Commitment [Member] | Village Concepts [Member] |
Maximum Commitment For All Active Development Projects | 7,450,000
Development in Process | (7,268,000)
Remaining Unfunded Development Commitment | 182,000
Development Commitment [Member] | Ignite Medical Resorts [Member] |
Maximum Commitment For All Active Development Projects | 25,350,000
Development in Process | (6,621,000)
Remaining Unfunded Development Commitment | 18,729,000
Development Commitment [Member] | Senior Living Communities [Member] |
Development in Process | 0
Remaining Unfunded Development Commitment | 3,100,000
Development Commitment [Member] | Navion Senior Solutions [Member] |
Maximum Commitment For All Active Development Projects | 650,000
Development in Process | 0
Remaining Unfunded Development Commitment | $ 650,000

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- Definition This element represents the total amount of capital improvements that an entity has committed to complete. + References No definition available. + Details
Name: | nhi_CapitalImprovementsCommitment
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the maximum commitment for all active development projects. + References No definition available. + Details
Name: | nhi_MaximumCommitmentForAllActiveDevelopmentProjects
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_DevelopmentInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_InvestmentTypeAxis=nhi_CapitalImprovementCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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- Details
Name: | us-gaap_InvestmentTypeAxis=nhi_DevelopmentCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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