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Mortgage And Other Notes Receivable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) properties | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Mortgage and other notes receivable, net | $ 246,111,000 | $ 141,486,000 |  |
Number of health care properties related to mortgage notes receivables | properties | 12 |  |  |
Allowance for Doubtful Accounts Receivable | $ 0 |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Collections of Principal | 2,307,000 | 35,897,000 | $ 69,060,000 |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 311,700,000 |  |  |
Number of Real Estate Properties | properties | 220 |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate | $ 202,877,000 | 98,110,000 | 99,179,000 | $ 101,124,000
Interest Income, Operating | 13,799,000 | 13,490,000 | $ 16,107,000 |
Senior Living Communities [Member] |  |  |  |
Loans and Lease Receivable, Maximum Revolving Amount | $ 15,000,000 |  |  |
Lessor, Operating Lease, Term of Contract | 15 years |  |  |
Revolving Note Receivable, Amount Outstanding | $ 1,900,000 |  |  |
Loans Receivable, Description of Variable Rate Basis, Reference Rate Maturity | 10 years |  |  |
Loans Receivable, Description of Variable Rate Basis | 0.0269 |  |  |
Loans Receivable, Basis Spread on Variable Rate | 6.00% |  |  |
Number of Term Loans | 2 |  |  |
Number of Units in Real Estate Property | 186 |  |  |
Number of Real Estate Properties | properties | 9 |  |  |
Bickford Note Investment [Member] |  |  |  |
Initial lease rate | 9.55% |  |  |
Contingent Incentive Payments | $ 2,000,000 |  |  |
Mortgage and other notes receivable, net | 32,471,000 |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 56,700,000 |  |  |
Evolve Senior Living [Member] |  |  |  |
Loan Term | 5 years |  |  |
Mortgage Note, Property Appreciation, Lender Participation, Rate | 10.00% |  |  |
Note Receivable Interest Rate | 8.00% |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate | $ 10,000,000 |  |  |
Senior Living Management [Member] |  |  |  |
Notes Receivable, Number Of Loans, Master Credit Agreement | 2 |  |  |
Notes Receivable, Interest Rate, Master Credit Agreement | 8.25% |  |  |
Notes Receivable, Maturity, Optional Extension, Years | 1 year |  |  |
Loan Term | 5 years |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 24,500,000 |  |  |
Number of Real Estate Properties | properties | 5 |  |  |
Note Receivable, Maturity, Second Optional Extension, Years | 2 years |  |  |
Secured By Real Estate [Member] |  |  |  |
Mortgage and other notes receivable, net | $ 202,877,000 | 98,110,000 |  |
Not Secured By Real Estate [Member] |  |  |  |
Mortgage and other notes receivable, net | 43,234,000 | $ 43,376,000 |  |
LCS Sagewood [Member] | Life Care Services [Member] |  |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement | $ 180,000,000 |  |  |
LCS Timber Ridge [Member] | Life Care Services [Member] |  |  |  |
Notes Receivable, Number Of Loans, Master Credit Agreement | 2 |  |  |
Purchase Option, Amount, Minimum | $ 115,000,000 |  |  |
Purchase Option, Period, Months | 120 days |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement | $ 154,500,000 |  |  |
2019 Reduction [Member] | Senior Living Communities [Member] |  |  |  |
Loans and Lease Receivable, Maximum Revolving Amount | 5,000,000 |  |  |
Mortgage Notes Paid Off [Member] | Traditions of Owatonna [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate | 4,256,000 |  |  |
Interest Income, Operating | 922,000 |  |  |
July 2016 [Member] | Bickford Note Investment [Member] |  |  |  |
Mortgage and other notes receivable, net | $ 13,047,000 |  |  |
Loan Term | 5 years |  |  |
Note Receivable Interest Rate | 9.00% |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 14,000,000 |  |  |
Note A [Member] | Senior Living Communities [Member] |  |  |  |
Note Receivable Interest Rate | 10.00% |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 12,000,000 |  |  |
Note A [Member] | LCS Sagewood [Member] | Life Care Services [Member] |  |  |  |
Notes Receivable, Interest Rate, Master Credit Agreement | 7.25% |  |  |
Loans And Leases Receivable, Commitment, Fixed Rates, Escalator, Basis Points | 10 |  |  |
Note Receivable, First Note Year For Rate Escalator | 3 years |  |  |
Loan Term | 10 years |  |  |
Note Receivable, Prepayment Penalty, Rate | 2.00% |  |  |
Note Receivable, Prepayment Penalty, Rate Decrease | 1000.00% |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement | $ 118,800,000 |  |  |
Note A [Member] | LCS Timber Ridge [Member] | Life Care Services [Member] |  |  |  |
Mortgage and other notes receivable, net | $ 57,939,000 |  |  |
Notes Receivable, Interest Rate, Master Credit Agreement | 6.75% |  |  |
Loans And Leases Receivable, Commitment, Fixed Rates, Escalator, Basis Points | 10 |  |  |
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, Total Borrowings, Master Credit Agreement | $ 60,000,000 |  |  |
Note B [Member] | Senior Living Communities [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 2,000,000 |  |  |
Note B [Member] | LCS Sagewood [Member] | Life Care Services [Member] |  |  |  |
Notes Receivable, Interest Rate, Master Credit Agreement | 8.50% |  |  |
Loan Term | 5 years |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement | $ 61,200,000 |  |  |
Note B [Member] | LCS Timber Ridge [Member] | Life Care Services [Member] |  |  |  |
Mortgage and other notes receivable, net | 1,953,000 |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ 515,000 |  |  |
Notes Receivable, Interest Rate, Master Credit Agreement | 8.00% |  |  |
Loan Term | 5 years |  |  |
Notes Receivable, Total Borrowings, Master Credit Agreement | $ 94,500,000 |  |  |

X
- Definition This item represents contingent payments that would be due to a development manager if certain operating metrics or performance thresholds were met. + References No definition available. + Details
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- Definition The initial rate charged under a lease entered into in connection with the purchase of a property. + References No definition available. + Details
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- Definition The concept represents a total loan term in number of years + References No definition available. + Details
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- 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
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- Definition This item represents the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Loans and Lease Receivable, Maximum Revolving Amount + References No definition available. + Details
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Balance Type: | debit
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X
- Definition This item represents the rate at which a lender will participate in the appreciation of the mortgaged properties' value during the period in which the mortgage note is outstanding. + References No definition available. + Details
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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
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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
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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
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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
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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
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Namespace Prefix: | nhi_
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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
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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
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Namespace Prefix: | nhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

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- 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

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

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- Definition Number of Term Loans + References No definition available. + Details
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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

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- Definition This concept represents the number of months during which an outstanding purchase option may be exercised. + References No definition available. + Details
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Period Type: | duration

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- Definition Revolving Note Receivable, Amount Outstanding + References No definition available. + Details
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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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
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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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Period Type: | duration

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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
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- 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
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- 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
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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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