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Note 10 - Mortgages Payable (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member]
Debt Instrument, Increase (Decrease), Net, Total	$ 206.0
Repayments of Long-term Debt, Total	161.9
Liabilities, Fair Value Adjustment	0.4
Mortgages [Member]
Debt Instrument, Increase (Decrease), Net, Total	12.4
Mortgages [Member] | Other Income (Expense), Net [Member]
Gain on Forgiveness of Debt	4.3
Relief of Accrued Interest	$ 3.4

X

- Definition

Amount of gain recorded in Income Statement related to forgiveness of debt.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount recorded during the period for relief of accrued interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Net increase or decrease in the carrying amount of the debt instrument for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Period Type:	duration

X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Period Type:

X

- Details

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