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Commitments And Contingencies (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) properties beds_or_units | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Real Estate Properties | properties | 209 |  |
Loans and Leases Receivable, Net Amount | $ 141,486,000 |  | $ 133,493,000
Maximum Commitment For All Active Development Projects | 88,380,000 |  |
Construction and Development Costs | $ (24,437,000) |  |
Bickford Development Properties [Member] |  |  |
Number Of Development Projects Active | properties | 5 |  |
Developer Incentive Payments | $ 250,000,000 |  |
Incentive to Lessee | $ 1,750,000,000 |  |
Ensign Group [Member] |  |  |
Number of Units in Real Estate Property | beds_or_units | 126 |  |
Lessor, Operating Lease, Term of Contract | 14 years |  |
Initial lease rate | 8.35% |  |
Senior Living Communities [Member] |  |  |
Number of Real Estate Properties | properties | 9 |  |
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 | $ 616,000 |  |
Loans Receivable, Description of Variable Rate Basis | 0.024 |  |
Loans Receivable, Basis Spread on Variable Rate | 6.00% |  |
Bickford Note Investment [Member] |  |  |
Initial lease rate | 9.55% |  |
Prestige Senior Living [Member] |  |  |
Number of Units in Real Estate Property | beds_or_units | 102 |  |
Lessor, Operating Lease, Term of Contract | 12 years |  |
Initial lease rate | 7.00% |  |
Lease Incentive Commitment Assessed As Not Probable | $ 1,000,000 |  |
Senior Living Management [Member] |  |  |
Number of Real Estate Properties | properties | 5 |  |
Maximum Contingent Amount [Member] | East Lake Capital [Member] |  |  |
Lease Incentive Commitment Assessed As Not Probable | $ 8,000,000 |  |
Capital Addition Purchase Commitments [Member] | Ensign Group [Member] |  |  |
Real Estate Properties, Commitment To Purchase, Amount |  | $ 42,000,000 |
Maximum Commitment For All Active Development Projects | 56,000,000 |  |
Construction and Development Costs | (14,000,000) |  |
Capital Improvement Commitment [Member] | Senior Living Communities [Member] |  |  |
Maximum Commitment For All Active Development Projects | 6,830,000 |  |
Construction and Development Costs | (970,000) |  |
Capital Improvement Commitment [Member] | East Lake Capital [Member] |  |  |
Maximum Commitment For All Active Development Projects | 400,000 |  |
Construction and Development Costs | 0 |  |
Revolving Credit Facility [Member] | Senior Living Communities [Member] |  |  |
Loans and Leases Receivable, Net Amount | 616,000 |  |
Development Commitment [Member] | Chancellor Healthcare [Member] |  |  |
Maximum Commitment For All Active Development Projects | 650,000 |  |
Construction and Development Costs | $ (62,000) |  |

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

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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_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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
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Balance Type: | credit
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- Definition Loans and Lease Receivable, Maximum Revolving Amount + References No definition available. + Details
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Namespace Prefix: | nhi_
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Balance Type: | debit
Period Type: | instant

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- Definition This item represents the maximum commitment for all active development projects. + References No definition available. + Details
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Namespace Prefix: | nhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- 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
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Data Type: | xbrli:monetaryItemType
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- Definition Revolving Note Receivable, Amount Outstanding + References No definition available. + Details
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Balance Type: | debit
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- Definition Revolving Note Receivable, Maximum Amount Available for Working Capital Purposes + References No definition available. + Details
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Namespace Prefix: | nhi_
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- Definition The aggregate costs related to construction and development services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- 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
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- 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
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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://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
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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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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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- Details
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- Details
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- Details
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