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Business Segments (Details Textual) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 Community | Sep. 30, 2023 USD ($) ft² Dwelling ApartmentHome Segment Home Community Property Hotel Room | Dec. 31, 2022 USD ($) | Jan. 01, 2022 Property ApartmentHome
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  | 3 |  |
Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Right-of-use lease assets | $ |  | $ 109.3 | $ 110.3 |
Lease liabilities | $ |  | $ 117.7 | $ 114.6 |
Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Property |  | 26 |  |
Number of units in real estate property |  | 1,185 |  |
Residential Apartment Communities in Redevelopment [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Community |  | 3 |  |
Apartment Homes Redevelopment Completed [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property |  | 276 |  |
Planned Apartment Homes [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property |  | 909 |  |
Planned Homes [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Home |  | 16 |  |
Accessory Dwelling Units [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property | Dwelling |  | 8 |  |
Hotel [Member] | Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Hotel |  | 1 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property | Room |  | 106 |  |
Event space square foot | ft² |  | 18,000 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Operating Portfolio Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Property |  |  |  | 21
Number of residential apartment community reclassified upon reaching stabilization | Community | 1 |  |  |
Wholly And Partially Owned Consolidated Properties [Member] | Residential Apartment Communities in Redevelopment [Member] | Continuing Operations [Member] | Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Property |  | 3 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Planned Apartment Homes [Member] | Operating Portfolio Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property |  |  |  | 5,600
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of real estate properties | Community |  | 12 |  |
Number of units in real estate property |  | 1,185 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Apartment Homes Redevelopment Completed [Member] | Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property |  | 276 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Planned Apartment Homes [Member] | Development and Redevelopment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property |  | 909 |  |
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Planned Homes [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of units in real estate property | Home |  | 16 |  |
Unconsolidated Investment in IQHQ and Mezzanine Investment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of apartment communities | Community |  | 4 |  |
Number of apartment homes |  | 142 |  |

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