This item represents the average age of a real estate portfolio.

No definition available.

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

- Definition

This item represents the total estimated future development costs for a specified development project.

+ References

No definition available.

+ Details

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

- Definition

The inital lease amount charged under a lease entered into in connection with the purchase of property.

+ References

No definition available.

+ Details

Name:	nhi_InitialLeaseAmount
Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Name:	nhi_JointVentureContributedPropertiesOwnershipInterestRetained
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 percentage of ownership interest in an operating company which is received in conjunction with the creation of a RIDEA-compliant joint venture.

+ References

No definition available.

+ Details

Name:	nhi_JointVentureOperatingCompanyOwnershipInterestReceived
Namespace Prefix:	nhi_
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

Name:	nhi_LeaseEscalatorRateAfterLeaseYear3
Namespace Prefix:	nhi_
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

Name:	nhi_LeaseEscalatorRateFromLeaseYear1toLeaseYear3
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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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Namespace Prefix:	nhi_
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

Name:	nhi_LeaseEscalatorRateafterLeaseYear4
Namespace Prefix:	nhi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

This item represents the amount to be received per month pursuant to an in-place lease agreement.

+ 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

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

- Definition

Number Of Additional Lease Renewal Options

+ References

No definition available.

+ Details

Name:	nhi_NumberOfAdditionalLeaseRenewalOptions
Namespace Prefix:	nhi_
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

Name:	nhi_NumberOfLessees
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

Name:	nhi_NumberOfRealEstatePropertiesAcquired
Namespace Prefix:	nhi_
Data Type:	xbrli:integerItemType
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

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

- Definition

Number of Master Leases

+ References

No definition available.

+ Details

Name:	nhi_NumberofMasterLeases
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

Name:	nhi_PercentageOfContinuingRevenue
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

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

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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

- 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

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
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.

+ 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 units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Future rental payments receivable within one year of the balance sheet date under an operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

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Data Type:	xbrli:monetaryItemType
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- 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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Data Type:	xbrli:monetaryItemType
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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.

+ 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 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Balance Type:	credit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

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Name:	invest_InvestmentAxis=nhi_NHC1991LeaseMember
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Name:	us-gaap_MajorCustomersAxis=nhi_BickfordSeniorLivingMember
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Name:	us-gaap_MajorCustomersAxis=nhi_SeniorLivingCommunitiesMember
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Data Type:	na
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Real Estate (Narrative) (Details) - Investments [Domain]	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Master_Leases properties beds_or_units renewalOptions	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Master_Leases properties beds_or_units renewalOptions	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 properties
Number of Real Estate Properties \| properties	174		174
Number of States in which Entity Operates	31		31
Nonportfolio Assets, Original Cost	$ 910,000		$ 910,000
Real Estate Investment Property, Portfolio Assets	$ 1,982,683,000		$ 1,982,683,000
Number of Lessees	24		24
Construction in Progress, Gross	$ 10,219,000		$ 10,219,000		$ 6,428,000
Security Deposit	21,275,000		21,275,000		21,648,000
Operating Leases, Income Statement, Lease Revenue	52,670,000	$ 41,353,000	105,165,000	$ 81,666,000
Straight Line Rent			$ 12,308,000	8,490,000
Lease Renewal Period In Years			5 years
Real Estate Held-for-sale	$ 8,467,000		$ 8,467,000		$ 0
Fundamental Long Term Care Holdings [Member]
Number of Real Estate Properties \| properties	2		2			3
Monthly Lease Amount			$ 250,000
Average Age Real Estate Portfolio
Impairment of Real Estate			$ 0
Bickford Development Properties [Member]
Development in Process	$ 4,328,000		$ 4,328,000
Number of Units in Real Estate Property \| beds_or_units	60		60
Number of Real Estate Properties To Be Constructed \| properties	8		8
2015 Bickford Development Properties [Member]
Number of Real Estate Properties \| properties	5		5
Number of Units in Real Estate Property	60		60
Estimated Future Development Cost	$ 55,000,000		$ 55,000,000
Number of Real Estate Properties To Be Constructed \| properties	5		5
2015 Bickford Development Properties - Construction Commenced [Member]
Construction in Progress, Gross	$ 3,842,000		$ 3,842,000
Number of Real Estate Properties To Be Constructed \| properties	2		2
2015 Bickford Development Properties - In Pre-Development [Member]
Construction in Progress, Gross	$ 486,000		$ 486,000
Holiday Acquisition Holdings [Member]
Number of Real Estate Properties \| properties	25		25
Lessor Leasing Arrangements, Operating Leases, Term of Contract			17 years
Lease Escalator Rate, From Lease Year 1 to Lease Year 3	4.50%		4.50%
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	19.00%	25.00%	20.00%	25.00%
Straight Line Rent	$ 2,616,000	$ 2,975,000	$ 5,233,000	$ 5,951,000
Minimum Annual Lease Income			$ 33,351,000
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	$ 9,133,000	$ 9,109,000	$ 18,360,000	$ 18,227,000
Percentage of Continuing Revenue	16.00%	21.00%	16.00%	21.00%
Percentage rent	$ 596,000	$ 573,000	$ 1,286,000	$ 1,154,000
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
Bickford Senior Living [Member]
Number of Real Estate Properties	31		31
Joint Venture Operating Company Ownership Interest Received	85.00%		85.00%
Development in Process	$ 486,000		$ 486,000
Operating Leases, Future Minimum Payments Receivable, Current	23,195,000		23,195,000
Operating Leases, Income Statement, Lease Revenue	$ 5,890,000	$ 5,202,000	$ 11,695,000	$ 10,465,000
Percentage of Continuing Revenue	10.00%	12.00%	10.00%	12.00%
Joint Venture Contributed Properties Ownership Interest Retained	85.00%		85.00%
Joint Venture Contributed Properties Ownership Interest Surrendered	15.00%		15.00%
Senior Living Communities [Member]
Operating Leases, Income Statement, Lease Revenue	$ 9,855,000		$ 19,711,000
Percentage of Continuing Revenue	18.00%		18.00%
Straight Line Rent	$ 2,105,000		$ 4,211,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	$ 4,570,000		$ 9,166,000
Senior Housing Community [Member]
Number of Real Estate Properties \| properties	105		105
Skilled Nursing Facility [Member]
Number of Real Estate Properties \| properties	64		64
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
Senior Housing Community [Member] \| Senior Living Communities [Member]
Number of Units in Real Estate Property \| beds_or_units	1,671		1,671
Lessor Leasing Arrangements, Operating Leases, Term of Contract			15 years
Initial Lease Amount	$ 31,000,000		$ 31,000,000
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%
Number Of Real Estate Properties Acquired \| properties			8
Number of additional lease renewal options	2		2