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Commitments And Contingencies (Details) | 9 Months Ended
--- | ---
Sep. 30, 2017 USD ($) properties beds_or_units
Number of Real Estate Properties | properties | 207
Ensign Group [Member] |
Real Estate Properties, Commitment To Purchase | properties | 3
Construction of transitional rehabilitation center, number of beds | beds_or_units | 126
Capital Addition Purchase Commitments [Member] | Ensign Group [Member] |
Real Estate Properties, Commitment To Purchase, Amount | $ 42,000,000
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
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
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: |