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

This item represents the number of free rent months allowed at the inception of a new lease.

+ References

No definition available.

+ Details

Name:	nhi_FreeRentLeasePeriodNumberofMonths
Namespace Prefix:	nhi_
Data Type:	xbrli:durationItemType
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 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

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
Namespace Prefix:	nhi_
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

Name:	nhi_LeaseEscalatorRateLeaseYear2toLeaseYear4
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 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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Namespace Prefix:	nhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	nhi_LesseePaymentToAcquirePurchaseOption
Namespace Prefix:	nhi_
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

Name:	nhi_MinimumAnnualLeaseIncome
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 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

Name:	nhi_Paymentstoacquirerealestatesellerearnoutcontingentnotprobable
Namespace Prefix:	nhi_
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

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

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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

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

- Definition

This item represents the number of real estate properties for which the entity has made a binding commitment to purchase.

+ References

No definition available.

+ Details

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

- Definition

This item refers to the number of properties acquired during the period.

+ References

No definition available.

+ Details

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

- Definition

This item represents the remaining unfunded development commitment related to a lease property.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981

+ Details

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Namespace Prefix:	us-gaap_
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.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
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

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=77902458&loc=d3e39896-112707

+ Details

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Namespace Prefix:	us-gaap_
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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

- 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=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
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

+ Details

Name:	us-gaap_RealEstateHeldforsale
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=98514028&loc=d3e3602-108585

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Name:	us-gaap_StraightLineRent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	invest_InvestmentAxis=nhi_BickfordDevelopmentPropertiesMember
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Name:	invest_InvestmentAxis=nhi_NHC1991LeaseMember
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Real Estate (Narrative) (Details)	3 Months Ended				6 Months Ended
Real Estate (Narrative) (Details)	Jun. 30, 2017 USD ($) properties beds_or_units renewalOptions Master_Leases shares	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($) properties	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($) properties beds_or_units renewalOptions Master_Leases shares	Jun. 30, 2016 USD ($) properties
Number of Real Estate Properties \| properties	207				207
Number of States in which Entity Operates	32				32
Nonportfolio Assets, Original Cost	$ 1,278,000				$ 1,278,000
Real Estate Investment Property, Portfolio Assets	$ 2,611,526,000				$ 2,611,526,000
Number of Lessees	29				29
Payments to Acquire Real Estate					$ 128,411,000	$ 261,610,000
Lessee Payment To Acquire Purchase Option		$ 1,250,000		$ 0
Remaining Unfunded Development Commitment	$ 53,112,000				53,112,000
Real Estate Investments During The Period					129,661,000
Operating Leases, Income Statement, Lease Revenue	65,735,000		$ 57,028,000		128,873,000	112,102,000
Straight Line Rent					12,005,000	10,583,000
Gain on sale of real estate	$ 0		2,928,000		$ 50,000	4,582,000
Bickford Development Properties [Member]
Number of Units in Real Estate Property \| beds_or_units	60				60
Ravn Senior Solutions [Member]
Real Estate Properties, Number Acquired \| properties					2
Number of Units in Real Estate Property \| beds_or_units	86				86
Payments to Acquire Real Estate					$ 16,100,000
Asset Purchase Transaction Costs					$ 100,000
Lessor, Operating Lease, Term of Contract					15 years
Initial lease rate	7.35%				7.35%
Real Estate Investments During The Period					$ 16,100,000
Capital Improvements Commitment	$ 207,000				207,000
Lease Incentive Commitment Assessed As Not Probable					1,500,000
Payments to acquire real estate, seller earnout, contingent, not probable					$ 1,000,000
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	16.00%		18.00%		16.00%	18.00%
Straight Line Rent	$ 1,849,000		$ 2,241,000		$ 3,698,000	$ 4,482,000
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	$ 9,318,000		$ 9,270,000		$ 18,831,000	$ 19,087,000
Percentage of Continuing Revenue	13.00%		15.00%		14.00%	16.00%
Lessor Equity Shares Owned, Significant Lessee \| shares	1,630,462				1,630,462
Percentage rent	$ 782,000		$ 733,000		$ 1,757,000	$ 2,013,000
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]
Real Estate Properties, Number Acquired \| properties					1
Number of Real Estate Properties \| properties	43				43
Operating Leases, Income Statement, Lease Revenue	$ 9,899,000		$ 7,165,000		$ 19,273,000	$ 13,471,000
Percentage of Continuing Revenue	14.00%		12.00%		14.00%	11.00%
Number of Real Estate Properties To Be Constructed \| properties	1				1
Straight Line Rent	$ 907,000		$ 63,000		$ 1,816,000	$ (2,000)
Joint Venture Contributed Properties Ownership Interest Retained	85.00%				85.00%
Joint Venture Contributed Properties Ownership Interest Surrendered	15.00%				15.00%
Minimum Annual Lease Income					$ 36,423,000
Bickford Senior Living [Member] \| Bickford Development Properties [Member]
Initial lease rate	9.00%				9.00%
Free Rent Lease Period, Number of Months					6 months
Bickford Senior Living [Member] \| Bickford RIDEA Properties [Member]
Number of Real Estate Properties \| properties	35				35
Bickford Senior Living [Member] \| Real Estate Acquisition [Member]
Number of Units in Real Estate Property \| beds_or_units	60				60
Asset Purchase Transaction Costs					$ 200,000
Lessor, Operating Lease, Term of Contract					14 years
Initial lease rate	7.25%				7.25%
Real Estate Investments During The Period					$ 10,400,000
Capital Improvements Commitment	$ 475,000				$ 475,000
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	$ 11,431,000		$ 9,855,000		$ 22,862,000	$ 19,711,000
Percentage of Continuing Revenue	16.00%		16.00%		17.00%	16.00%
Straight Line Rent	$ 1,746,000		$ 1,795,000		$ 3,492,000	$ 3,591,000
Number Of Additional Lease Renewal Options	2				2
Lease Renewal Period In Years					5 years
Prestige Senior Living [Member]
Real Estate Properties, Number Acquired \| properties					1
Number of Units in Real Estate Property \| beds_or_units	102				102
Payments to Acquire Real Estate					$ 26,200,000
Asset Purchase Transaction Costs					$ 112,000
Lessor, Operating Lease, Term of Contract					12 years
Initial lease rate	7.00%				7.00%
Real Estate Investments During The Period					$ 26,200,000
Lease Escalator Rate Lease Year 2 to Lease Year 4	3.50%				3.50%
Lease Escalator Rate after Lease Year 4	2.50%				2.50%
Lease Incentive Commitment Assessed As Not Probable					$ 1,000,000
Payments to acquire real estate, seller earnout, contingent, not probable					$ 1,000,000
The Lasalle Group [Member]
Real Estate Properties, Number Acquired \| properties					5
Number of Units in Real Estate Property \| beds_or_units	223				223
Payments to Acquire Real Estate					$ 61,800,000
Asset Purchase Transaction Costs					$ 65,000
Lessor, Operating Lease, Term of Contract					15 years
Initial lease rate	7.00%				7.00%
Real Estate Investments During The Period					$ 61,865,000
Lease Escalator Rate, From Lease Year 1 to Lease Year 3	3.50%				3.50%
Lease Escalator Rate, After Lease Year 3	2.50%				2.50%
Lease Incentive Commitment Assessed As Not Probable					$ 5,000,000
Payments to acquire real estate, seller earnout, contingent, not probable					$ 2,500,000
Ensign Group [Member]
Real Estate Properties, Number Acquired \| properties					1
Number of Units in Real Estate Property \| beds_or_units	126				126
Payments to Acquire Real Estate					$ 13,846,000
Lessee Payment To Acquire Purchase Option					$ 1,250,000
Lessor, Operating Lease, Term of Contract					14 years
Initial lease rate	8.35%				8.35%
Real Estate Properties, Commitment To Purchase \| properties	3				3
Real Estate Investments During The Period					$ 15,096,000
Senior Housing Community [Member]
Number of Real Estate Properties \| properties	134				134
Skilled Nursing Facility [Member]
Number of Real Estate Properties \| properties	68		2		68	2
Gain on sale of real estate				2,805,000
Asset Held For Sale, Agreed Selling Price			$ 24,600,000			$ 24,600,000
Skilled Nursing Facility [Member] \| Lease Maturity Extension [Member]
Number of Real Estate Properties \| properties	6				6
Lessor, Operating Lease, Payments to be Received	$ 9,800,000				$ 9,800,000
Lessor, Operating Lease, Term of Contract					12 years
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
Skilled Nursing Facility [Member] \| Health Services Management [Member]
Lessor, Operating Lease, Payments to be Received		$ 7,241,000
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
Vacant Land [Member]
Gain on sale of real estate			123,000
Grangeville, ID [Member]
Operating Leases, Income Statement, Lease Revenue			$ 73,000
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