Organization (Details) ft² in Millions, $ in Billions		9 Months Ended
Oct. 22, 2021 USD ($) property	Sep. 30, 2021 ft² property
RPAI \| Subsequent Event
Organization [Line Items]
Number of real estate properties	102
Merger transaction value \| $	$ 4.7
Assumption of debt \| $	$ 1.9
Operating and Redevelopment Properties
Organization [Line Items]
Number of real estate properties		87
Area of real estate property \| ft²		16.8
Under Construction Retail Development Project
Organization [Line Items]
Number of real estate properties		6
General Partner Units
Organization [Line Items]
Ownership interest of General Partner		97.20%
KRG, LP
Organization [Line Items]
Ownership interest of Common Partner		2.80%

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