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Commitments And Contingencies Commitments and Contingencies (Schedule of Loss Contingencies) (Details) | 9 Months Ended
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Sep. 30, 2017 USD ($)
Contingent Funding Commitment | $ 27,430,000
Contingent Funding Commitment, Remaining Unfunded Amount | 25,430,000
Contingent Amount Funded [Member] |
Contingent Funding Commitment, Amount Funded | (2,000,000)
Bickford / Sycamore [Member] |
Contingent Funding Commitment | 10,000,000
Contingent Funding Commitment, Amount Funded | (2,000,000)
Contingent Funding Commitment, Remaining Unfunded Amount | 8,000,000
East Lake Capital [Member] |
Contingent Funding Commitment | 8,000,000
Contingent Funding Commitment, Remaining Unfunded Amount | 8,000,000
East Lake Capital [Member] | Maximum Contingent Amount [Member] |
Lease Incentive Commitment Assessed As Not Probable | 8,000,000
East Lake Capital [Member] | Contingent Amount Funded [Member] |
Contingent Funding Commitment, Amount Funded | 0
Sycamore Street [Member] |
Letters of Credit Outstanding, Amount | 1,930,000
Sycamore Street [Member] | Contingent Amount Funded [Member] |
Letters of Credit Outstanding, Amount | 0
Ravn Senior Solutions [Member] |
Contingent Funding Commitment | 1,500,000
Contingent Funding Commitment, Remaining Unfunded Amount | 1,500,000
Lease Incentive Commitment Assessed As Not Probable | 1,500,000
Ravn Senior Solutions [Member] | Contingent Amount Funded [Member] |
Contingent Funding Commitment, Amount Funded | 0
Prestige Senior Living [Member] |
Contingent Funding Commitment | 1,000,000
Contingent Funding Commitment, Remaining Unfunded Amount | 1,000,000
Lease Incentive Commitment Assessed As Not Probable | 1,000,000
Prestige Senior Living [Member] | Contingent Amount Funded [Member] |
Contingent Funding Commitment, Amount Funded | 0
The Lasalle Group [Member] |
Contingent Funding Commitment | 5,000,000
Contingent Funding Commitment, Remaining Unfunded Amount | 5,000,000
Lease Incentive Commitment Assessed As Not Probable | 5,000,000
The Lasalle Group [Member] | Contingent Amount Funded [Member] |
Contingent Funding Commitment, Amount Funded | $ 0

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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

X
- 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

X
- 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

X
- Definition This item represents the amount of a payment or a series of payments related to a lease incentive commitment which has been assessed as not probable and therefore is not recorded as payable. + References No definition available. + Details
Name: | nhi_LeaseIncentiveCommitmentAssessedAsNotProbable
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_MajorCustomersAxis=nhi_BickfordSycamoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=nhi_EastLakeCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MajorCustomersAxis=nhi_SycamoreStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=nhi_RavnSeniorSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=nhi_PrestigeSeniorLivingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |