Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2026	Sep. 30, 2025	Sep. 30, 2023
Loss Contingencies [Line Items]
Reserves for warranties and general liability	$ 5,200	$ 4,600
Payments from reserves	1,500	800
Letters of credit outstanding, amount	$ 4,800
DownREIT operating partnership units, outstanding	666,831
Operating partnership units outstanding, fair value	$ 90,900
Costs associated with property sold under threat of condemnation, net	0	$ 12,924	$ 0
San Antonio Center
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 32,600
Congressional Plaza | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	26.63%
Maximum partnership percentage required to purchase	100.00%
Congressional Plaza | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 67,000
Congressional Plaza | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 71,000
Plaza El Segundo | Put Option
Loss Contingencies [Line Items]
Number of members with purchase options	2
Plaza El Segundo | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 25,000
Plaza El Segundo | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 28,000
The Grove at Shrewsbury | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	4.10%
Brook 35 | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	6.50%
Grove at Shrewsbury and Brook 35 | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 6,000
Grove at Shrewsbury and Brook 35 | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 7,000
Hoboken | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	10.00%
Hoboken | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 9,000
Hoboken | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 10,000
Camelback Colonnade and Hilton Village | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	2.00%
Camelback Colonnade and Hilton Village | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 4,000
Camelback Colonnade and Hilton Village | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 5,000
Grossmont Center | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	40.00%
Grossmont Center | Put Option | Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 68,000
Grossmont Center | Put Option | Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option	$ 73,000
Scenario, Forecast | Mercer Mall
Loss Contingencies [Line Items]
Purchase price under option						$ 55,000
Scenario, Forecast | Mercer Mall | Put Option
Loss Contingencies [Line Items]
Purchase price under option					$ 60,000
Scenario, Forecast | Melville Mall
Loss Contingencies [Line Items]
Purchase price under option					$ 3,600
Scenario, Forecast | Melville Mall | Put Option
Loss Contingencies [Line Items]
Purchase price under option				$ 3,600
Member One In Plaza El Segundo | Plaza El Segundo | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	10.00%
Member Two In Plaza El Segundo | Plaza El Segundo | Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage	11.80%
Capital Improvement, Development, and Redevelopment Projects
Loss Contingencies [Line Items]
Contractual obligations	$ 319,200