Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Excluding KIR and RioCan [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments in and Advances to Affiliates [Line Items]
Assets	$ 5,618.9	$ 6,991.9
Noncontrolling interests	21.4	19.2
Partners’/Members’ capital	2,427.6	2,914.5
	5,618.9	6,991.9
Real Estate [Member]
Investments in and Advances to Affiliates [Line Items]
Assets	5,410.3	6,601.8
Other Assets [Member]
Investments in and Advances to Affiliates [Line Items]
Assets	208.6	390.1
Mortgage Payable [Member]
Investments in and Advances to Affiliates [Line Items]
Liabilities	3,061.3	3,956.2
Construction Loans [Member]
Investments in and Advances to Affiliates [Line Items]
Liabilities	21.0
Other Liabilities [Member]
Investments in and Advances to Affiliates [Line Items]
Liabilities	$ 87.6	$ 102.0

Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Excluding KIR and RioCan [Member], USD $)
In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Investments in and Advances to Affiliates [Line Items]

Assets

$ 5,618.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets

$ 6,991.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets

Noncontrolling interests

21.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest

19.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest

Partners’/Members’ capital

2,427.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital

2,914.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital

5,618.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity

6,991.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity

Real Estate [Member]

Investments in and Advances to Affiliates [Line Items]

Assets

5,410.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= kim_RealEstatetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

6,601.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= kim_RealEstatetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

Other Assets [Member]

Investments in and Advances to Affiliates [Line Items]

Assets

208.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= us-gaap_OtherAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

390.1us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= us-gaap_OtherAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

Mortgage Payable [Member]

Investments in and Advances to Affiliates [Line Items]

Liabilities

3,061.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= kim_MortgagePayableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

3,956.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= kim_MortgagePayableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

Construction Loans [Member]

Investments in and Advances to Affiliates [Line Items]

Liabilities

21.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

Other Liabilities [Member]

Investments in and Advances to Affiliates [Line Items]

Liabilities

$ 87.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

$ 102.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ kim_EquityMethodInvestmentSummarizedFinancialInformationByLineItemAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kim_ExcludingKIRAndRioCanMember

- Definition

The amount of assets reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(g))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 28

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph bb

-Article 1

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph g

-Subparagraph 1, 2

-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph w

-Article 1

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- Definition

Amount of equity, excluding noncontrolling interest, attributable to the equity method investment of the entity.

+ References

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- Definition

The amount of liabilities reported by an equity method investment of the entity.

+ References

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- Definition

The amount of liabilities and equity reported by an equity method investment of the entity.

+ References

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- Definition

Amount of equity attributable to noncontrolling interests of an equity method investment of the entity.

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