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Commitments And Contingencies Commitments and Contingencies (Schedule of Loss Contingencies) (Details) | Mar. 31, 2019 USD ($)
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Lease Inducement [Member] |
Contingent Funding Commitment | $ 29,850,000
Contingent Funding Commitment, Amount Funded | (9,000,000)
Contingent Funding Commitment, Remaining Unfunded Amount | 20,850,000
Bickford Senior Living [Member] | Lease Inducement [Member] |
Contingent Funding Commitment | 10,000,000
Contingent Funding Commitment, Amount Funded | (8,750,000)
Contingent Funding Commitment, Remaining Unfunded Amount | 1,250,000
Bickford Senior Living [Member] | Incentive Loan Draws [Member] |
Contingent Funding Commitment | 8,000,000
Contingent Funding Commitment, Amount Funded | (250,000)
Contingent Funding Commitment, Remaining Unfunded Amount | 7,750,000
Wingate Healthcare [Member] | Lease Inducement [Member] |
Contingent Funding Commitment | 5,000,000
Contingent Funding Commitment, Amount Funded | 0
Contingent Funding Commitment, Remaining Unfunded Amount | 5,000,000
Navion Senior Solutions [Member] | Lease Inducement [Member] |
Contingent Funding Commitment | 4,850,000
Contingent Funding Commitment, Amount Funded | 0
Contingent Funding Commitment, Remaining Unfunded Amount | 4,850,000
Ignite Medical Resorts [Member] | Lease Inducement [Member] |
Contingent Funding Commitment | 2,000,000
Contingent Funding Commitment, Amount Funded | 0
Contingent Funding Commitment, Remaining Unfunded Amount | $ 2,000,000

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- Definition This item represents the maximum amount of a contingent funding commitment. + References No definition available. + Details
Name: | nhi_ContingentFundingCommitment
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the amount of a contingent funding commitment which has been funded. + References No definition available. + Details
Name: | nhi_ContingentFundingCommitmentAmountFunded
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the remaining unfunded amount related to a contingent funding commitment. + References No definition available. + Details
Name: | nhi_ContingentFundingCommitmentRemainingUnfundedAmount
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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