Earnings and Dividends per Share and per Unit - Reconciliations of the numerator and denominator (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Earnings Per Share and Per Unit [Line Items]
Net income (loss) attributable to AIR common stockholders	$ 634,444	$ 903,642	$ 447,124
Effect of dilutive instruments	6,280	6,388	0
Net (loss) income attributed to AIR common stockholders	$ 640,724	$ 910,030	$ 447,124
Denominator:
Basic weighted-average common shares outstanding	147,899	154,093	154,135
Dilutive common share equivalents outstanding	2,321	2,494	368
Dilutive weighted-average common shares outstanding	150,220	156,587	154,503
Earnings per unit - basic (in dollars per share)	$ 4.29	$ 5.86	$ 2.90
Earnings per unit - diluted (in dollars per share)	$ 4.27	$ 5.81	$ 2.89
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	3,400	0	1,500
Apartment Income REIT, L.P
Schedule of Earnings Per Share and Per Unit [Line Items]
Net income (loss) attributable to AIR common stockholders	$ 677,165	$ 962,414	$ 475,557
Effect of dilutive instruments	6,280	6,388	0
Net (loss) income attributed to AIR common stockholders	$ 683,445	$ 968,802	$ 475,557
Denominator:
Basic weighted-average common shares outstanding	157,687	164,141	162,739
Dilutive common share equivalents outstanding	2,321	2,494	369
Dilutive weighted-average common shares outstanding	160,008	166,635	163,108
Earnings per unit - basic (in dollars per share)	$ 4.29	$ 5.86	$ 2.92
Earnings per unit - diluted (in dollars per share)	$ 4.27	$ 5.81	$ 2.92