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Note 7 - Variable Interest Entities ("VIE") (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entity, Number of Entities	24	27
Consolidated Operating Properties [Member]
Variable Interest Entity, Number of Entities	22	24
Variable Interest Entity, Consolidated, Carrying Amount, Assets, Total	$ 889.6	$ 1,200.0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities, Total	$ 71.7	$ 383.5
Real Estate Under Development [Member]
Variable Interest Entity, Number of Entities	2	3
Variable Interest Entity, Consolidated, Carrying Amount, Assets, Total	$ 296.2	$ 307.9
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities, Total	42.9	$ 34.2
Variable Interest Entity, Financial or Other Support, Amount	$ 106.0

X

- Definition

Number of Variable Interest Entities for which the Company is the primary beneficiary.

+ References

No definition available.

+ Details

Name:	kim_VariableInterestEntityNumberOfEntities
Namespace Prefix:	kim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

+ Details

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

+ Details

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=kim_ConsolidatedOperatingPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=kim_RealEstateUnderDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: