This element represents the total amount of capital improvements that an entity has committed to complete.

No definition available.

Name:	nhi_CapitalImprovementsCommitment
Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the first lease year in which a lessor has the option to reset the annual rent to a fair market amount.

+ References

No definition available.

+ Details

Name:	nhi_FairMarketRentResetOptionPeriodFirstLeaseYear
Namespace Prefix:	nhi_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the last lease year in which a lessor has the option to reset the annual rent to a fair market amount.

+ References

No definition available.

+ Details

Name:	nhi_FairMarketRentResetOptionPeriodLastLeaseYear
Namespace Prefix:	nhi_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

This item represents the annual percent increase in a lease payment.

+ References

No definition available.

+ Details

Name:	nhi_LeaseEscalatorRate
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The initial escalator rate charged from lease year 3 through the end of the lease term under a lease entered into in connection with the purchase of a property.

+ References

No definition available.

+ Details

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

- Definition

The initial lease escalator rate charged from lease year 2 through lease year 4 under a lease entered into in connection with the purchase of a property.

+ References

No definition available.

+ Details

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

- Definition

The initial lease escalator to be charged starting after lease year 4 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

- Definition

This item represents a lessee's payment to acquire a purchase option.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the number of shares of a lessor that are owned by a significant lessee as of the end of the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the minimum annual lease income to be received.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the original cost of corporate assets that are not part of the investment portfolio.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Number Of Additional Lease Renewal Options

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of lessees of real estate property at the end of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Real Estate Properties Acquired

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Master Leases

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the percentage of income recognized from a lease tenant.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the rental revenue rate earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Generally stipulated in the lease agreement, it usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof.

+ References

No definition available.

+ Details

Name:	nhi_PercentageRentRate
Namespace Prefix:	nhi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the amount of an outstanding purchase option.

+ References

No definition available.

+ Details

Name:	nhi_PurchaseOptionAmount
Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The element represents the original cost of all portfolio leased assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Real Estate Investments During The Period

+ References

No definition available.

+ Details

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Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents an accumulated straight-line rent receivable balance written off as a result of a lease amendment or termination.

+ References

No definition available.

+ Details

Name:	nhi_WriteOffOfStraightLineRentReceivable
Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Term of the lessor's leasing arrangement renewal, 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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Period Type:	duration

- 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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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of lease payments to be received by lessor for operating lease.

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-Name Accounting Standards Codification
-Topic 842
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- Definition

The number of states the entity operates in as of the balance sheet date.

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No definition available.

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

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

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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-SubTopic 10
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-Paragraph 13
-Subparagraph (c)
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Balance Type:	credit
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- Definition

Amount of cash outflow for transaction costs in a sale-leaseback recognized in investing activities. Includes, but is not limited to, closing and debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	invest_InvestmentAxis=nhi_LeaseEscalatorFloorMember
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Real Estate (Narrative) (Details)	1 Months Ended	3 Months Ended				6 Months Ended
Real Estate (Narrative) (Details)	Jan. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) Master_Leases properties beds_or_units renewalOptions shares	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) Master_Leases properties beds_or_units renewalOptions shares	Jun. 30, 2017 USD ($)	Jan. 12, 2018 beds_or_units	Dec. 31, 2017 USD ($)
Number of Real Estate Properties \| properties		219				219
Number of States in which Entity Operates		33				33
Nonportfolio Assets, Original Cost		$ 2,471,000				$ 2,471,000
Real Estate Investment Property, Portfolio Assets		$ 2,801,479,000				$ 2,801,479,000
Number of Lessees		29				29
Payments to Acquire Real Estate						$ 129,558,000	$ 128,411,000
Lessee Payment To Acquire Purchase Option			$ 3,775,000		$ 1,250,000
Real Estate Investments During The Period						130,294,000
Sale Leaseback Transaction, Transaction Costs, Investing Activities						100,000
Operating Leases, Income Statement, Lease Revenue		$ 69,869,000		$ 65,725,000		139,122,000	128,853,000
Deferred Rent Receivables, Net		$ 108,771,000				108,771,000			$ 97,359,000
Straight Line Rent						$ 11,797,000	12,005,000
Lease Escalator Floor [Member]
Lease Escalator Rate		2.00%				2.00%
Lease Escalator Ceiling [Member]
Lease Escalator Rate		3.00%				3.00%
Holiday Acquisition Holdings [Member]
Number of Real Estate Properties \| properties		25				25
Lessor, Operating Lease, Term of Contract		17 years
Lease Escalator Rate, After Lease Year 3		3.50%				3.50%
Operating Leases, Income Statement, Lease Revenue		$ 10,954,000		$ 10,954,000		$ 21,908,000	$ 21,908,000
Percentage of Continuing Revenue		15.00%		16.00%		15.00%	16.00%
Straight Line Rent		$ 1,530,000		$ 1,849,000		$ 3,061,000	$ 3,698,000
National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties		42				42
Number of Master Leases \| Master_Leases		2				2
Operating Leases, Income Statement, Lease Revenue		$ 9,389,000		$ 9,318,000		$ 19,064,000	$ 18,831,000
Percentage of Continuing Revenue		13.00%		13.00%		13.00%	14.00%
Lessor Equity Shares Owned, Significant Lessee \| shares		1,630,462				1,630,462
National Healthcare Corporation [Member] \| NHC - 1991 Lease [Member]
Number of Real Estate Properties \| properties		35				35
Number Of Additional Lease Renewal Options \| renewalOptions		2				2
Lease Renewal Period In Years						5 years
Percentage Rent Rate						0.04
Minimum Annual Lease Income						$ 30,750,000
National Healthcare Corporation [Member] \| NHC - 2013 Lease [Member]
Number Of Real Estate Properties Acquired \| properties						7
Percentage Rent Rate						0.04
Minimum Annual Lease Income						$ 3,450,000
Purchase Option Amount		$ 49,000,000				49,000,000
Non-Performing Lease [Member]
Lessor, Operating Lease, Payments to be Received		$ 150,000				150,000
Write Off Of Straight Line Rent Receivable						$ 1,436,000
Bickford Senior Living [Member]
Number of Real Estate Properties \| properties		52				52
Number of Units in Real Estate Property \| beds_or_units		320				320
Real Estate Investments During The Period						$ 69,750,000
Sale Leaseback Transaction, Transaction Costs, Investing Activities						$ 500,000
Lessor, Operating Lease, Term of Contract						15 years
Initial lease rate		6.85%				6.85%
Operating Leases, Income Statement, Lease Revenue		$ 12,411,000		$ 9,899,000		$ 23,856,000	$ 19,273,000
Percentage of Continuing Revenue		17.00%		14.00%		16.00%	14.00%
Number Of Real Estate Properties Acquired \| properties						5
Straight Line Rent		$ 1,203,000		$ 907,000		$ 2,372,000	$ 1,816,000
Minimum Annual Lease Income						44,987,000
Capital Improvements Commitment		$ 1,750,000				$ 1,750,000
Fair Market Rent Reset Option Period, First Lease Year						3 years
Fair Market Rent Reset Option Period, Last Lease Year						5 years
Bickford Senior Living [Member] \| April 2018 Acquisition [Member]
Number of Real Estate Properties \| properties		5				5
Senior Living Communities [Member]
Number of Real Estate Properties \| properties		9				9
Number of Units in Real Estate Property		1,970				1,970
Lessor, Operating Lease, Term of Contract						15 years
Lease Escalator Rate Lease Year 2 to Lease Year 4		4.00%				4.00%
Lease Escalator Rate after Lease Year 4		3.00%				3.00%
Operating Leases, Income Statement, Lease Revenue		$ 11,457,000		$ 11,431,000		$ 22,905,000	$ 22,862,000
Percentage of Continuing Revenue		16.00%		16.00%		16.00%	17.00%
Straight Line Rent		$ 1,359,000		$ 1,746,000		$ 2,717,000	$ 3,492,000
Number Of Additional Lease Renewal Options		2				2
Lease Renewal Period In Years		5 years
Ensign Group [Member]
Number of Units in Real Estate Property \| beds_or_units		132				132
Payments to Acquire Real Estate						$ 29,000,000
Real Estate Investments During The Period						$ 43,404,000
Initial lease rate		8.10%				8.10%
Number Of Real Estate Properties Acquired \| properties		2				3
Comfort Care Senior Living [Member]
Number of Units in Real Estate Property \| beds_or_units		106				106
Real Estate Investments During The Period						$ 17,140,000
Initial lease rate		7.25%				7.25%
Number Of Real Estate Properties Acquired \| properties						2
Default Tenant [Member]
Percentage of Continuing Revenue						4.00%
Deferred Rent Receivables, Net		$ 4,059,000				$ 4,059,000
Material Non-Compliance Tenant [Member]
Percentage of Continuing Revenue						2.00%
Deferred Rent Receivables, Net		$ 1,200,000				$ 1,200,000
Senior Housing Community [Member]
Number of Real Estate Properties \| properties		143				143
Skilled Nursing Facility [Member]
Number of Real Estate Properties \| properties		71				71
Skilled Nursing Facility [Member] \| National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties		39				39
Skilled Nursing Facility [Member] \| National Healthcare Corporation [Member] \| Subleased Facilities [Member]
Number of Real Estate Properties \| properties		4				4
Hospital [Member]
Number of Real Estate Properties \| properties		3				3
Medical Office Building [Member]
Number of Real Estate Properties \| properties		2				2
Independent Living Facility [Member] \| National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties		3				3
Ensign Waxahachie Purchase [Member]
Number of Units in Real Estate Property \| beds_or_units								121
Payments to Acquire Real Estate	$ 14,404,000
Lessee Payment To Acquire Purchase Option	$ 1,275,000
Purchase Commitment [Member] \| Ensign Group [Member]
Number Of Real Estate Properties Acquired \| properties						4
Ground Lease [Member] \| Bickford Senior Living [Member]
Lessor, Operating Lease, Term of Contract						50 years