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Note 5 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) ft² | Sep. 30, 2020 USD ($) | Aug. 03, 2021 USD ($) | Dec. 31, 2020 ft²
Gross Leasable Area (Square Foot) | ft² | [1] |  | 1,435 |  |  |
Payments to Acquire Interest in Joint Venture |  |  | $ 7,546 | $ 14,640 |  |
Weingarten Realty Investors [Member] |  |  |  |  |  |
Secured Debt Assumed by Joint Ventures in Business Combination, Including Fair Market Value Adjustment |  |  |  |  | $ 191,500 |
Secured Debt Assumed by Joint Ventures in Business Combination, Fair Market Value Adjustment |  |  |  |  | 800 |
Subsequent Event [Member] |  |  |  |  |  |
Joint Venture, Ownership, Purchased, Percent |  | 70.00% |  |  |  |
Joint Venture, Number of Property Interests |  | 6 |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 425,800 |  |  |  |
Ownership Interest in Joint Venture, Percentage |  | 100.00% |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  | $ 425,800 |  |  |  |
All Equity Method Investments [Member] |  |  |  |  |  |
Number of Real Estate Properties |  |  | 125 |  |  | 97
Gross Leasable Area (Square Foot) | ft² |  |  | 25,300,000 |  |  | 21,200,000
Unconsolidated Joint Ventures Acquired in Weingarten Merger [Member] |  |  |  |  |  |
Number of Real Estate Properties |  |  | 30 |  |  |
Gross Leasable Area (Square Foot) | ft² |  |  | 4,400,000 |  |  |
Number of Joint Ventures |  |  | 9 |  |  |
Joint Ventures, Fair Market Value |  |  |  |  | $ 586,200 |
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |  |  |  |
Number of Real Estate Properties, Interest Disposed of or Transferred |  |  | 2 |  |  |
Equity Method Investment, Sales Price |  |  | $ 53,700 |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  |  | $ 4,200 |  |  |
[1] | Gross leasable area ("GLA")

X
- Definition Represents the amount of sale price for the entity's equity method investment. + References No definition available. + Details
Name: | kim_EquityMethodInvestmentSalesPrice
Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of property interests in joint venture. + References No definition available. + Details
Name: | kim_JointVentureNumberOfPropertyInterests
Namespace Prefix: | kim_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percent ownership of joint venture that was purchased. + References No definition available. + Details
Name: | kim_JointVentureOwnershipPurchasedPercent
Namespace Prefix: | kim_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the fair market value of joint ventures as of the specified date. + References No definition available. + Details
Name: | kim_JointVenturesFairMarketValue
Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of joint ventures with the entity. + References No definition available. + Details
Name: | kim_NumberOfJointVentures
Namespace Prefix: | kim_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Represents the percentage of ownership interest in a joint venture. + References No definition available. + Details
Name: | kim_OwnershipInterestInJointVenturePercentage
Namespace Prefix: | kim_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition With regard to the amount of secured debt assumed by joint ventures in a business combination, this element represents the fair market value adjustment. + References No definition available. + Details
Name: | kim_SecuredDebtAssumedByJointVenturesInBusinessCombinationFairMarketValueAdjustment
Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of secured debt assumed by joint ventures in a business combination, including fair market value adjustment. + References No definition available. + Details
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Namespace Prefix: | kim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=123570139&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=123367319&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=123367319&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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

X
- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + 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 (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kim_RealEstateJointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=kim_OperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |