Note 4 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) ft² in Millions, $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2020 ft²	Dec. 31, 2019 ft²
All Equity Method Investments [Member]
Number of Real Estate Properties		97	98
Gross Leasable Area (Square Foot) \| ft²		21.2	21.3
Real Estate Joint Ventures [Member] \| Operating Properties [Member]
Number of Real Estate Properties, Interest Disposed of or Transferred	8
Equity Method Investment, Sales Price	$ 240.9
Equity Method Investment, Realized Gain (Loss) on Disposal, Total	$ 13.7

Represents the amount of sale price for the entity's equity method investment.

No definition available.

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Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

- Definition

Represents the number of real estate property interests disposed of or transferred.

+ References

No definition available.

+ Details

Name:	kim_NumberOfRealEstatePropertiesInterestDisposedOfOrTransferred
Namespace Prefix:	kim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kim_AllEquityMethodInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kim_RealEstateJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=kim_OperatingPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: