Note 16 - Noncontrolling Interests and Redeemable Noncontrolling Interests (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Aug. 03, 2021 USD ($) shares	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) shares		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares		Dec. 31, 2018 USD ($) shares	Dec. 31, 2007 USD ($) shares	Dec. 31, 2006 USD ($) $ / shares shares
Noncontrolling Interest, Increase from Subsidiary Equity Issuance						$ 149
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total				$ 13,480		15,784	$ 17,943
Payments to Noncontrolling Interests						20,600
Adjustments to Additional Paid in Capital, Other						$ 19,300
Asset Acquisition, Consideration Transferred, Total				$ 896,707
Number of Properties Sold				13	[1]	3	20	[2]
Disposal Group, Including Discontinued Operation, Consideration				$ 612,400	[1]	$ 31,800	$ 344,700	[2]
Measurement Input, Cap Rate [Member]
Noncontrolling Interest, Fair Value, Measurement Input				5.50
Measurement Input, Discount Rate [Member]
Noncontrolling Interest, Fair Value, Measurement Input				6.50
KIM RDC, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Discontinued Operations, Disposed of by Sale [Member] | Disposal of Two Operating Properties [Member]
Number of Properties Sold		2
Disposal Group, Including Discontinued Operation, Consideration		$ 108,000
KIM RDC, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Operating Properties [Member]
Asset Acquisition, Consideration Transferred, Total			$ 104,000
KPR [Member] | Discontinued Operations, Disposed of by Sale [Member] | Disposal of Two Operating Properties [Member]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 2,100
Consolidated Joint Ventures Structured as DownREIT Partnerships [Member]
Non-controlling Interest, Units Redeemed (in shares) | shares				73,466
Non-controlling Interest, Cumulative Par Value				$ 1,700
Stock Issued During Period, Shares, Redemption/ Conversion of Noncontrolling Interests (in shares) | shares				73,466
Joint Venture with KP Lancewood [Member] | KIM RDC, LLC [Member]
Noncontrolling Interest, Ownership Percentage by Parent			100.00%
Weingarten Realty Investors [Member] | Consolidated Joint Ventures Structured as DownREIT Partnerships [Member]
Redeemable Units to Company Common Stock, Ratio	1
Number of Operating Properties Acquired	2
Redeemable Noncontrolling Interest, Equity, Fair Value, Total	$ 41,700
Weingarten Realty Investors [Member] | Raleigh Limited Partnership [Member]
Non-controlling Interest, Units (in shares) | shares	1,813,615
Weingarten Realty Investors [Member] | Madison Village Limited Partnership [Member]
Non-controlling Interest, Units (in shares) | shares	174,411
Weingarten Realty Investors [Member] | Consolidated Joint Ventures Other than DownREIT Partnerships [Member]
Number of Operating Properties Acquired	8
Redeemable Noncontrolling Interest, Equity, Fair Value, Total				$ 40,100
Noncontrolling Interest in Joint Ventures	$ 132,300
Convertible Units [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance											$ 5,300
Non-controlling Interest, Units (in shares) | shares											138,015
Convertible Units [Member] | Fair Market Value Adjustments [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance											$ 300
Capital Units, Class B [Member]
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total				16,100		16,100
Non-controlling Interest, Units Issued (in shares) | shares											647,758
Non-controlling Interest, Par Value (in dollars per share) | $ / shares											$ 37.24
Redeemable Units to Company Common Stock, Ratio											1
Non-controlling Interest, Units Redeemed (in shares) | shares							188,951		25,970	30,000
Non-controlling Interest, Cumulative Par Value							$ 8,000		$ 1,100	$ 1,100
Cash Paid to Noncontrolling Interests to Settle Capital Units							$ 4,000		$ 500
Noncontrolling Interest [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance						149
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests						1,300
Noncontrolling Interest [Member] | Consolidated Joint Ventures Structured as DownREIT Partnerships [Member]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests				1,500
Additional Paid-in Capital [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance						0
Additional Paid-in Capital [Member] | Consolidated Joint Ventures Structured as DownREIT Partnerships [Member]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests				$ 1,500
PUERTO RICO
Number of Real Estate Properties				7
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				$ 233,000
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total				5,200		$ 5,200
PUERTO RICO | Fair Market Value Adjustments [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				15,100
PUERTO RICO | Non-convertible Units [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				158,600
PUERTO RICO | Convertible Units [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				45,800
PUERTO RICO | Premiums [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				$ 13,500

[1] During 2021, the Company purchased its partner’s 70.0% remaining interest in Jamestown Portfolio, which is comprised of six property interests. The Company then entered into a joint venture with Blackstone Real Estate Income Trust, Inc. (“BREIT”) in which it contributed these six properties for a gross sales price of $425.8 million, including $170.0 million of non-recourse mortgage debt. As a result, the Company no longer consolidates these six property interests and recognized a loss on change in control of interests of $0.4 million. The Company has a 50.0% investment in this joint venture ($130.1 million as of the date of deconsolidation), included in Investments in and advances to real estate joint ventures on the Company’s Consolidated Balance Sheets.

[2] Includes the sale of a land parcel at a development project located in Dania Beach, FL for a sales price of $32.5 million, which resulted in a gain of $4.3 million.