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Commitments And Contingencies (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) properties | Dec. 31, 2017 properties
Real Estate Properties, Commitment To Purchase, Amount | $ 47,017,000 |
Number of Real Estate Properties | properties |  | 210
Ensign Group [Member] |  |
Real Estate Properties, Commitment To Purchase | properties | 2 |
Capital Addition Purchase Commitments [Member] | Ensign Group [Member] |  |
Real Estate Properties, Commitment To Purchase, Amount | $ 28,000,000 |
Maximum Contingent Amount [Member] | East Lake Capital [Member] |  |
Lease Incentive Commitment Assessed As Not Probable | $ 8,000,000 |
East Lake Mgmt, Acquisition [Member] |  |
Number of Real Estate Properties | properties | 3 |
Payments to acquire real estate, seller earnout, contingent, not probable | $ 750,000 |
Bickford Development Properties [Member] |  |
Developer Incentive Payments | 250,000,000 |
Incentive to Lessee | $ 1,750,000,000 |
Number Of Development Projects Active | properties | 5 |

X
- 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

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

X
- Definition This element represents the amount of payments to be made to the seller of a real estate property contingent upon the occurrence of specific events. + References No definition available. + Details
Name: | nhi_Paymentstoacquirerealestatesellerearnoutcontingentnotprobable
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the number of real estate properties for which the entity has made a binding commitment to purchase. + References No definition available. + Details
Name: | nhi_RealEstatePropertiesCommitmentToPurchase
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the purchase commitment for real estate properties which the entity has entered into a binding agreement to acquire. + References No definition available. + Details
Name: | nhi_RealEstatePropertiesCommitmentToPurchaseAmount
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
Name: | us-gaap_IncentiveToLessee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_InvestmentTypeAxis=nhi_MaximumContingentAmountMember
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: |

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

X
- Details
Name: | invest_InvestmentAxis=nhi_BickfordDevelopmentPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |