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Commitments And Contingencies Commitments and Contingencies (Schedule of Lease Commitments) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Maximum Commitment For All Active Development Projects | $ 88,380
Real Estate Properties, Commitment To Purchase, Amount | 47,017
Construction and Development Costs | (41,363)
Capital Addition Purchase Commitments [Member] | Ensign Group [Member] |
Maximum Commitment For All Active Development Projects | 56,000
Real Estate Properties, Commitment To Purchase, Amount | 28,000
Construction and Development Costs | (28,000)
Development Commitment [Member] | Chancellor Healthcare [Member] |
Maximum Commitment For All Active Development Projects | 650
Construction and Development Costs | (62)
Remaining Unfunded Development Commitment | 588
Development Commitment [Member] | Navion Senior Solutions [Member] |
Maximum Commitment For All Active Development Projects | 650
Construction and Development Costs | 0
Remaining Unfunded Development Commitment | 650
Capital Improvement Commitment [Member] | Bickford Senior Living [Member] |
Maximum Commitment For All Active Development Projects | 2,400
Construction and Development Costs | (1,647)
Remaining Unfunded Development Commitment | 753
Capital Improvement Commitment [Member] | East Lake Capital [Member] |
Maximum Commitment For All Active Development Projects | 400
Construction and Development Costs | 0
Remaining Unfunded Development Commitment | 400
Capital Improvement Commitment [Member] | Senior Living Communities [Member] |
Maximum Commitment For All Active Development Projects | 6,830
Construction and Development Costs | (1,424)
Remaining Unfunded Development Commitment | 5,406
Capital Improvement Commitment [Member] | Discovery Senior Living [Member] |
Maximum Commitment For All Active Development Projects | 500
Construction and Development Costs | 0
Remaining Unfunded Development Commitment | 500
Capital Improvement Commitment [Member] | East Lake / Watermark Retirement [Member] |
Maximum Commitment For All Active Development Projects | 10,000
Construction and Development Costs | (5,900)
Remaining Unfunded Development Commitment | 4,100
Capital Improvement Commitment [Member] | Sante Partners Commitment [Member] |
Maximum Commitment For All Active Development Projects | 3,500
Construction and Development Costs | (2,621)
Remaining Unfunded Development Commitment | 879
Capital Improvement Commitment [Member] | Village Concepts [Member] |
Maximum Commitment For All Active Development Projects | 7,450
Construction and Development Costs | (1,709)
Remaining Unfunded Development Commitment | $ 5,741

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

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- 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

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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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- Details
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