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Note 3 - Real Estate - Acquisition of Operating Properties (Details) - North Valley Parcel [Member] ft² in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($) ft²
Purchase Price Cash | $ | $ 7,073 |
Purchase Price GLA (Square Foot) | ft² | 9 | [1]
[1] | Gross leasable area ("GLA")

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- Definition The amount of floor space available to be rented in a commercial property. + References No definition available. + Details
Name: | kim_GrossLeasableArea
Namespace Prefix: | kim_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=kim_NorthValleyParcelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |