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Investment Activity (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 01, 2022 USD ($) property facility | Apr. 30, 2022 USD ($) bedOrUnitInTheProperty | Mar. 31, 2022 USD ($) property | Sep. 30, 2022 USD ($) property boardMember facility lease | Jun. 30, 2022 USD ($) property | Mar. 31, 2022 USD ($) property | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) property boardMember facility lease | Sep. 30, 2021 USD ($) | Aug. 31, 2022 USD ($) | May 31, 2022 property | Apr. 01, 2022 property masterLease | Dec. 31, 2021 USD ($) | Jun. 30, 2021 property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Full payment of an outstanding construction note receivable |  | $ 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate, net |  |  |  | $ 14,840,000 |  |  | $ 19,941,000 | $ 28,342,000 | $ 26,426,000 |  |  |  |  |
Impairment of real estate |  |  |  | 9,500,000 |  |  |  | 38,300,000 |  |  |  |  |  |
Rental income |  |  |  | 59,394,000 |  |  | 67,043,000 | 163,935,000 | $ 210,143,000 |  |  |  |  |
Net real estate balance |  |  |  | $ 32,600,000 |  |  |  | $ 32,600,000 |  |  |  |  |  |
Percentage of continuing revenue |  |  |  |  |  |  |  | 12.00% | 0.00% |  |  |  |  |
Straight-line rental income |  |  |  |  |  |  |  | $ (11,360,000) | $ 12,189,000 |  |  |  |  |
Number of leases | lease |  |  |  | 4 |  |  |  | 4 |  |  |  |  |  |
Real estate properties, net |  |  |  | $ 2,140,853,000 |  |  |  | $ 2,140,853,000 |  |  |  |  | $ 2,317,880,000 |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 162 |  |  |  | 162 |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties, net |  |  |  | $ 261,300,000 |  |  |  | $ 261,300,000 |  |  |  |  |  |
Lease Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 3 |  |  |  | 3 |  |  |  |  |  |
Lease Option, Between 2025 and 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  | $ 1,800,000 |  |  | 1,700,000 | $ 5,300,000 | 5,100,000 |  |  |  |  |
Real estate properties, net |  |  |  | $ 60,100,000 |  |  |  | $ 60,100,000 |  |  |  |  |  |
Lease Extended Until 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease escalator minimum |  |  |  | 8.00% |  |  |  | 8.00% |  |  |  |  |  |
Lease Payment Deferral and Abatement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  | $ 10,700,000 |  |  |  |  |  |
Lease Payment Deferral |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease income |  |  |  |  |  |  |  | $ 47,300,000 |  |  |  |  |  |
Geographic Concentration Risk | Investment Consideration Benchmark | South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  | 12.10% |  |  |  |  |  |
Geographic Concentration Risk | Investment Consideration Benchmark | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  | 11.10% |  |  |  |  |  |
Asset Held For Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |
Asset Held For Sale | Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 10 |  |  |  | 10 |  |  |  |  |  |
Reclassified to assets held for sale in the second quarter of 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 6 |  |  |  | 6 |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  | $ 1,100,000 |  |  | 1,200,000 | $ 2,000,000 | 3,500,000 |  |  |  |  |
Encore Senior Living |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired in a assisted living facility | bedOrUnitInTheProperty |  | 53 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  | $ 13,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration of an ongoing property tax appeal |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration expected to be paid |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Master lease, term |  |  |  | 15 years |  |  |  | 15 years |  |  |  |  |  |
Initial lease rate |  |  |  | 7.25% |  |  |  | 7.25% |  |  |  |  |  |
Annual escalator of lease |  |  |  | 2.50% |  |  |  | 2.50% |  |  |  |  |  |
Bickford Senior Living |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  | $ 2,400,000 |  |  |  | $ 2,400,000 |  |  |  |  |  |
Rental income |  |  |  | $ 7,100,000 |  |  |  | $ 17,000,000 | $ 26,224,000 |  |  |  |  |
Number of real estate properties | property |  |  |  | 36 |  |  |  | 36 |  |  | 3 |  |  |
Percentage of continuing revenue |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |
Loan and lease losses, write-offs |  |  |  |  | $ 18,100,000 |  |  |  |  |  |  |  |  |
Lease incentives |  |  |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |
Amortization of rate deferral |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |
Bickford Senior Living | Lease Extended Until 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  | 28,300,000 |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  | 11 |  |  |  |  |  |  | 27 |  |
Number of master lease agreements | masterLease |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Bickford Senior Living | Lease Payment Deferral and Abatement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease income |  |  |  |  |  |  | 3,500,000 | 5,500,000 | $ 13,800,000 |  |  |  |  |
Bickford Senior Living | Lease Payment Deferral |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease income |  |  |  |  |  | $ 1,500,000 |  | $ 26,000,000 |  |  |  |  |  |
Bickford Senior Living | Facilities Transitioned To Other Operators |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |
Lessor, operating lease, term of contract |  |  | 10 years |  |  | 10 years |  |  |  |  |  |  |  |
Bickford Senior Living | Assisted Living Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Straight-line rent receivable |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Bickford Senior Living | Asset Held For Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |
Bickford Senior Living | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 6
Discovery |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 23,700,000 |  |  |  |  |  |  |  |  |  |
Discovery | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of real estate sold in cash consideration |  |  |  | 16,900,000 |  |  |  |  |  |  |  |  |  |
Asset disposition transaction cost |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
National HealthCare Corporation (“NHC”) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  | $ 27,875,000 | $ 28,290,000 |  |  |  |  |
Percentage of continuing revenue |  |  |  |  |  |  |  | 13.00% | 12.00% |  |  |  |  |
Number of facilities | facility | 35 |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  | $ 34,300,000 |  |  |  | $ 34,300,000 |  | $ 30,800,000 |  |  |  |
Number of board members | boardMember |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |
National HealthCare Corporation (“NHC”) | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of real estate sold in cash consideration | $ 44,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset disposition transaction cost | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate properties sold | property | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  | $ 600,000 |  |  | 900,000 | $ 2,400,000 | $ 2,800,000 |  |  |  |  |
Number of facilities | facility |  |  |  | 35 |  |  |  | 35 |  |  |  |  |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  | $ 38,325,000 | $ 38,094,000 |  |  |  |  |
Number of real estate properties | property |  |  |  | 10 |  |  |  | 10 |  |  |  |  |  |
Percentage of continuing revenue |  |  |  |  |  |  |  | 18.00% | 17.00% |  |  |  |  |
Straight-line rental income |  |  |  | $ (100,000) |  |  | $ (700,000) | $ (300,000) | $ (1,800,000) |  |  |  |  |
Holiday Transition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | $ 22,811,000 |  |  |  |  |
Number of real estate properties | property |  |  |  | 17 |  |  |  | 17 |  |  |  |  |  |
Percentage of continuing revenue |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Holiday Transition | Facilities Transitioned To Other Operators |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Holiday Transition | Asset Held For Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  |  |  |  |  | 1 |  |

X
- Definition Annual Lease Escalator + References No definition available. + Details
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- Definition Asset Disposition Transaction Cost + References No definition available. + Details
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- Definition Cash Consideration Of An Ongoing Property Tax Appeal + 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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Namespace Prefix: | nhi_
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Balance Type: | na
Period Type: | instant

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- Definition This item represents the minimum rate a lease payment escalates each year. + References No definition available. + Details
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- Definition Lease Incentives + References No definition available. + Details
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- Definition Lessor, Operating Lease, Annual Base Rent + References No definition available. + Details
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- Definition Lessor, Operating Lease, Number Of Facility Leases Amended + References No definition available. + Details
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- Definition Number of Board Members + References No definition available. + Details
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Balance Type: | na
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- Definition This element represents the percentage of income recognized from a lease tenant. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition The periodic expense to reduce the value of the rate deferral asset that is created when utilities under bill customers during periods of rate increases by deferring rate increases. These customers eventually pay higher rates to repay the utility for the rate deferral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Purchase price of expected asset acquisition prior to consideration being transferred. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 15 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911878&loc=d3e8732-128492 + Details
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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123398962&loc=d3e400-110220 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 440 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6491277&loc=d3e6429-115629 + Details
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