Investment in Joint Ventures - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) property apartment	Jun. 30, 2023 property	Sep. 30, 2023 USD ($) property apartment	Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items]
Long-term debt	$ 3,128,234		$ 3,128,234	$ 3,641,629
Non-recourse property debt, net	$ 2,231,238		$ 2,231,238	$ 1,985,430
Global Institutional Investor Joint Venture
Variable Interest Entity [Line Items]
Number of properties in portfolio | property	10		10
Gain on disposal	$ 698,800
Global Institutional Investor Joint Venture | Apartment Income REIT, L.P.
Variable Interest Entity [Line Items]
Ownership, percentage		30.00%
Global Institutional Investor Joint Venture | Washington DC
Variable Interest Entity [Line Items]
Number of properties in portfolio | apartment	456		456
Long-term debt	$ 155,000		$ 155,000
Apartment homes in communities owned by VIEs | property		443
General partners' contributed capital	95,000		$ 95,000
Purchase price	$ 250,000
Core JV
Variable Interest Entity [Line Items]
Number of properties in portfolio | property	10		10
Long-term debt	$ 1,100,000		$ 1,100,000
Long-term debt, gross	373,300		373,300
Non-recourse property debt, net	644,400		$ 644,400
Proceeds from sale of interest in partnership unit	$ 201,900
Core JV | Apartment Income REIT, L.P.
Variable Interest Entity [Line Items]
Ownership, percentage	53.00%		53.00%
Huntington Gateway
Variable Interest Entity [Line Items]
Gain on disposal			$ 500
Equity method investment, ownership interest sold		70.00%
Cash flow from operations		50.00%
Joint Venture Partner
Variable Interest Entity [Line Items]
Non-recourse property debt, net	$ 611,400		$ 611,400
Apartment homes in communities owned by VIEs	328		328