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Mortgage And Other Notes Receivable (Details) | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 30, 2017 | Jun. 30, 2017 USD ($) properties beds_or_units | Jul. 31, 2017 | Dec. 31, 2016 USD ($)
Mortgage and other notes receivable, net |  | $ 141,107,000 |  | $ 133,493,000
Number of health care properties related to mortgage notes receivables | properties |  | 8 |  |
Allowance for Doubtful Accounts Receivable |  | $ 0 |  | $ 0
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 117,000,000 |  |
Number of Real Estate Properties | properties |  | 207 |  |
Secured By Real Estate [Member] |  |  |  |
Mortgage and other notes receivable, net |  | $ 95,357,000 |  |
Not Secured By Real Estate [Member] |  |  |  |
Mortgage and other notes receivable, net |  | 45,750,000 |  |
Life Care Services [Member] |  |  |  |
Mortgage and other notes receivable, net |  | 51,871,000 |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | 60,000,000 |  |
Notes Receivable, Total Borrowings, Master Credit Agreement |  | $ 154,500,000 |  |
Notes Receivable, Number Of Loans, Master Credit Agreement |  | 2 |  |
Purchase Option, Amount, Minimum |  | $ 115,000,000 |  |
Purchase Option, Period, Months |  | 120 days |  |
Purchase Option, Open Period, Begin, Note Year |  | 5 years |  |
Senior Living Communities [Member] |  |  |  |
Mortgage and other notes receivable, net |  | $ 15,742,000 |  |
Loans Receivable, Description of Variable Rate Basis, Reference Rate Maturity |  | 10 years |  |
Loans Receivable, Description of Variable Rate Basis |  | 0.0231 |  |
Number of Units in Real Estate Property |  | 1,970 |  |
Loans and Lease Receivable, Maximum Revolving Amount |  | $ 15,000,000 |  |
Lessor, Operating Lease, Term of Contract |  | 15 years |  |
Revolving Note Receivable, Maximum Amount Available for Working Capital Purposes |  | $ 5,000,000 |  |
Revolving Note Receivable, Amount Outstanding |  | $ 1,742,000 |  |
Loans Receivable, Basis Spread on Variable Rate |  | 6.00% |  |
Number of Term Loans |  | 2 |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 29,000,000 |  |
Number of Real Estate Properties | properties |  | 9 |  |
Bickford Note Investment [Member] |  |  |  |
Initial lease rate |  | 9.55% |  |
Mortgage and other notes receivable, net |  | $ 8,126,000 |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | 28,000,000 |  |
Senior Living Management [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 24,500,000 |  |
Notes Receivable, Number Of Loans, Master Credit Agreement |  | 2 |  |
Loan Term |  | 5 years |  |
Notes Receivable, Interest Rate, Master Credit Agreement |  | 8.25% |  |
Number of Real Estate Properties | properties |  | 5 |  |
Notes Receivable, Maturity, Optional Extension, Years |  | 1 year |  |
Note Receivable, Maturity, Second Optional Extension, Years |  | 2 years |  |
Note A [Member] | Life Care Services [Member] |  |  |  |
Mortgage and other notes receivable, net |  | $ 51,871,000 |  |
Notes Receivable, Total Borrowings, Master Credit Agreement |  | $ 60,000,000 |  |
Note Receivable, First Note Year For Rate Escalator |  | 3 years |  |
Loan Term |  | 10 years |  |
Note Receivable, Prepayment, Disallowance Period |  | 3 years |  |
Note Receivable, Prepayment Penalty, Rate |  | 5.00% |  |
Note Receivable, Prepayment Penalty, Rate Decrease |  | 1.00% |  |
Notes Receivable, Interest Rate, Master Credit Agreement |  | 6.75% |  |
Loans And Leases Receivable, Commitment, Fixed Rates, Escalator, Basis Points |  | 10 |  |
Note A [Member] | Senior Living Communities [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 12,000,000 |  |
Note Receivable Interest Rate |  | 10.00% |  |
Note B [Member] | Life Care Services [Member] |  |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement |  | $ 94,500,000 |  |
Loan Term |  | 5 years |  |
Mortgage Loans on Real Estate, Collections of Principal |  | $ (76,220,000) |  |
Notes Receivable, Interest Rate, Master Credit Agreement |  | 8.00% |  |
Note B [Member] | Senior Living Communities [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 2,000,000 |  |
Subsequent Event [Member] |  |  |  |
Initial lease rate |  |  | 7.00% |
Lessor, Operating Lease, Term of Contract | 10 years |  |  |

X
- Definition The initial rate charged under a lease entered into in connection with the purchase of a property. + References No definition available. + Details
Name: | nhi_InitialLeaseRate
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The concept represents a total loan term in number of years + References No definition available. + Details
Name: | nhi_LoanTerm
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the number of basis points by which the interest rate on a fixed rate note or lease receivable will escalate periodically. + References No definition available. + Details
Name: | nhi_LoansAndLeasesReceivableCommitmentFixedRatesEscalatorBasisPoints
Namespace Prefix: | nhi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | nhi_LoansReceivableDescriptionofVariableRateBasisReferenceRateMaturity
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans and Lease Receivable, Maximum Revolving Amount + References No definition available. + Details
Name: | nhi_LoansandLeaseReceivableMaximumRevolvingAmount
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This concept represents the note year in which the note receivable interest rate will begin to escalate by a fixed amount. + References No definition available. + Details
Name: | nhi_NoteReceivableFirstNoteYearForRateEscalator
Namespace Prefix: | nhi_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept reflects the interest rate to be received on a loan receivable. + References No definition available. + Details
Name: | nhi_NoteReceivableInterestRate
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the second optional extension of the maturity date for a note receivable in years. + References No definition available. + Details
Name: | nhi_NoteReceivableMaturitySecondOptionalExtensionYears
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept refers to the period of time during which a note receivable may not be prepaid. + References No definition available. + Details
Name: | nhi_NoteReceivablePrepaymentDisallowancePeriod
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the percentage of outstanding principal that will be paid as a prepayment penalty. + References No definition available. + Details
Name: | nhi_NoteReceivablePrepaymentPenaltyRate
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the annual percentage point decrease in the prepayment penalty percentage rate. + References No definition available. + Details
Name: | nhi_NoteReceivablePrepaymentPenaltyRateDecrease
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the interest rate to be received for outstanding borrowings under a master credit agreement. + References No definition available. + Details
Name: | nhi_NotesReceivableInterestRateMasterCreditAgreement
Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents an option to extend the maturity of a note receivable. + References No definition available. + Details
Name: | nhi_NotesReceivableMaturityOptionalExtensionYears
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the number of notes receivable in a master credit agreement. + References No definition available. + Details
Name: | nhi_NotesReceivableNumberOfLoansMasterCreditAgreement
Namespace Prefix: | nhi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the total amount of available borrowings in a notes receivable master credit agreement. + References No definition available. + Details
Name: | nhi_NotesReceivableTotalBorrowingsMasterCreditAgreement
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number Of Health Care Properties Related To Mortgage Notes Receivables + References No definition available. + Details
Name: | nhi_NumberOfHealthCarePropertiesRelatedToMortgageNotesReceivables
Namespace Prefix: | nhi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Term Loans + References No definition available. + Details
Name: | nhi_NumberofTermLoans
Namespace Prefix: | nhi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the minimum amount of a purchase option when the agreement indicates the greater of this amount of fair value. + References No definition available. + Details
Name: | nhi_PurchaseOptionAmountMinimum
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This concept represents the note year during which the purchase option period opens. + References No definition available. + Details
Name: | nhi_PurchaseOptionOpenPeriodBeginNoteYear
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the number of months during which an outstanding purchase option may be exercised. + References No definition available. + Details
Name: | nhi_PurchaseOptionPeriodMonths
Namespace Prefix: | nhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revolving Note Receivable, Amount Outstanding + References No definition available. + Details
Name: | nhi_RevolvingNoteReceivableAmountOutstanding
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Revolving Note Receivable, Maximum Amount Available for Working Capital Purposes + References No definition available. + Details
Name: | nhi_RevolvingNoteReceivableMaximumAmountAvailableforWorkingCapitalPurposes
Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LessorLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61082-112788 + Details
Name: | us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetReportedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
Name: | us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_LoansReceivableDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of principal collected on mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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: | invest_InvestmentAxis=nhi_SecuredByRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
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Balance Type: |
Period Type: |