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Note 6 - Marketable Securities - Amortized Cost and Unrealized Gain (Loss) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized cost	$ 114,331	$ 114,531
Unrealized gains, net	677,805	592,423
Marketable securities	$ 792,136	$ 706,954

X

- Definition

The item represents the total cost of debt and equity securities, including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

No definition available.

+ Details

Name:	kim_MarketableSecuritiesAmortizedCost
Namespace Prefix:	kim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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