This element represents the agreed selling price for an asset classified at the balance sheet date as held for sale.

No definition available.

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

- Definition

Asset Purchase Transaction Costs

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- 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 percentage of ownership interest which is retained subsequent to contribution into a joint venture.

+ 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 the percentage of ownership interest which is surrendered subsequent to contribution into a joint venture.

+ References

No definition available.

+ Details

Name:	nhi_JointVentureContributedPropertiesOwnershipInterestSurrendered
Namespace Prefix:	nhi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the amount, reflected as a percentage of the prior year amount, by which a lease payment will increase each lease year.

+ References

No definition available.

+ Details

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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 escalator rate charged from lease year 1 and through lease year 3 under a lease entered into in connection with the purchase of a property.

+ References

No definition available.

+ Details

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- 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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- 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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- 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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- 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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- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
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- 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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- Definition

Number Of Additional Lease Renewal Options

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Number Of Real Estate Properties Acquired

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

This element represents the number of real estate properties to be constructed, based on an agreement or commitment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of Master Leases

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

This element represents the amount of payments to be made to the seller of a real estate property contingent upon the occurrence of specific events.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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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

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Balance Type:	na
Period Type:	duration

- Definition

This item represents the amount of an outstanding purchase option.

+ References

No definition available.

+ Details

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

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- 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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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.

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Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- 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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Period Type:	instant

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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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Data Type:	xbrli:integerItemType
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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- 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, 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. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

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- Definition

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

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Article 5
-Subsection 19, 20, 22

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Real Estate (Narrative) (Details)	3 Months Ended
Real Estate (Narrative) (Details)	Mar. 31, 2016 USD ($) properties beds_or_units Master_Leases renewalOptions shares	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Number of Real Estate Properties \| properties	181
Number of States in which Entity Operates	31
Nonportfolio Assets, Original Cost	$ 976,000
Real Estate Investment Property, Portfolio Assets	$ 2,112,897,000
Number of Lessees	26
Payments to Acquire Real Estate	$ 9,463,000	$ 10,000
Construction in Progress, Gross	18,702,000		$ 13,011,000
Operating Leases, Income Statement, Lease Revenue	55,074,000	52,495,000
Straight Line Rent	5,286,000	6,089,000
Gain on sale of real estate	1,654,000	0
Real Estate Held-for-sale	$ 0		$ 1,346,000
East Lake Mgmt, Acquisition [Member]
Lessor Leasing Arrangements, Operating Leases, Term of Contract	10 years
Capital Improvements Commitment	$ 400,000
Lease Incentive Commitment Assessed As Not Probable	8,000,000
Payments to acquire real estate, seller earnout, contingent, not probable	750,000
Bickford Development Properties [Member]
Development in Process	$ 25,626,000
Number of Units in Real Estate Property \| beds_or_units	60
Number of Real Estate Properties To Be Constructed \| properties	8
2015 Bickford Development Properties [Member]
Number of Real Estate Properties \| properties	5
Village Concepts [Member]
Number of Units in Real Estate Property \| beds_or_units	98
Payments to Acquire Real Estate	$ 9,463,000
Asset Purchase Transaction Costs	$ 213,000
Lessor Leasing Arrangements, Operating Leases, Term of Contract	15 years
Initial lease rate	7.25%
Lease Escalator Rate after Lease Year 4	3.00%
Lease Escalator Rate, From Lease Year 1 to Lease Year 3	2.00%
Lease Escalator Rate, After Lease Year 3	2.50%
Capital Improvements Commitment	$ 350,000
Holiday Acquisition Holdings [Member]
Number of Real Estate Properties \| properties	25
Lessor Leasing Arrangements, Operating Leases, Term of Contract	17 years
Lease Escalator Rate, From Lease Year 1 to Lease Year 3	4.50%
Lease Escalator Rate, After Lease Year 3	3.50%
Operating Leases, Income Statement, Lease Revenue	$ 10,954,000	$ 10,954,000
Percentage of Continuing Revenue	19.00%	20.00%
Straight Line Rent	$ 2,241,000	$ 2,616,000
National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties	42
Number of Master Leases \| Master_Leases	2
Operating Leases, Income Statement, Lease Revenue	$ 9,817,000	$ 9,227,000
Percentage of Continuing Revenue	17.00%	17.00%
Lessor Equity Shares Owned, Significant Lessee \| shares	1,630,462
Percentage rent	$ 1,280,000	$ 690,000
National Healthcare Corporation [Member] \| NHC - 1991 Lease [Member]
Number of Real Estate Properties \| properties	35
Number Of Additional Lease Renewal Options \| renewalOptions	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
Bickford Senior Living [Member]
Number of Real Estate Properties	32
Operating Leases, Income Statement, Lease Revenue	$ 6,307,000	$ 5,804,000
Percentage of Continuing Revenue	11.00%	10.00%
Joint Venture Contributed Properties Ownership Interest Retained	85.00%
Joint Venture Contributed Properties Ownership Interest Surrendered	15.00%
Minimum Annual Lease Income	$ 25,529,000
Lease Escalator, Percent	3.00%
Senior Living Communities [Member]
Number of Units in Real Estate Property	1,671
Lessor Leasing Arrangements, Operating Leases, Term of Contract	15 years
Lease Escalator Rate Lease Year 2 to Lease Year 4	4.00%
Lease Escalator Rate after Lease Year 4	3.00%
Operating Leases, Income Statement, Lease Revenue	$ 9,855,000	$ 9,855,000
Percentage of Continuing Revenue	17.00%	18.00%
Number Of Real Estate Properties Acquired \| properties	8
Straight Line Rent	$ 1,795,000	$ 2,105,000
Number Of Additional Lease Renewal Options	2
Lease Renewal Period In Years	5 years
Senior Housing Community [Member]
Number of Real Estate Properties \| properties	115
Skilled Nursing Facility [Member]
Number of Real Estate Properties \| properties	61
Skilled Nursing Facility [Member] \| National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties	39
Skilled Nursing Facility [Member] \| National Healthcare Corporation [Member] \| Subleased Facilities [Member]
Number of Real Estate Properties \| properties	4
Hospital [Member]
Number of Real Estate Properties \| properties	3
Medical Office Building [Member]
Number of Real Estate Properties \| properties	2
Independent Living Facility [Member] \| National Healthcare Corporation [Member]
Number of Real Estate Properties \| properties	3
Grangeville, ID [Member]
Operating Leases, Income Statement, Lease Revenue	$ 73,000	$ 80,000
Gain on sale of real estate	1,654,000
Real Estate Held-for-sale	1,346,000
Asset Held For Sale, Agreed Selling Price	3,000,000
Senior Housing Community [Member] \| East Lake Mgmt, Acquisition [Member]
Payments to Acquire Real Estate	66,900,000
8-Year AIG Private Placement Notes [Member]
Unsecured Debt	$ 50,000,000