Earnings and Dividends per Share and per Unit - Reconciliations of Numerator and Denominator in Calculations of Basic and Diluted Earnings (Loss) per Share and per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Earnings Per Share And Per Unit [Line Items]
Net (loss) income attributable to AIR common stockholders	$ 663,596	$ 1,760	$ 650,700	$ 574,363
Effect of dilutive instruments	1,570	0	4,710	4,807
Net (loss) income attributable to AIR common stockholders	$ 665,166	$ 1,760	$ 655,410	$ 579,170
Denominator:
Basic weighted-average common shares/units equivalents outstanding (in shares)	147,474	153,811	148,372	155,488
Dilutive common share/unit equivalents outstanding (in shares)	2,571	246	2,320	1,952
Dilutive weighted-average common shares/units outstanding (in shares)	150,045	154,057	150,692	157,440
Earnings per share/unit - basic (in dollars per share)	$ 4.50	$ 0.01	$ 4.39	$ 3.69
Earnings per share/unit - diluted (in dollars per share)	$ 4.43	$ 0.01	$ 4.35	$ 3.68
Apartment Income REIT, L.P.
Schedule Of Earnings Per Share And Per Unit [Line Items]
Net (loss) income attributable to AIR common stockholders	$ 705,982	$ 1,897	$ 691,945	$ 611,416
Effect of dilutive instruments	1,570	0	4,710	4,935
Net (loss) income attributable to AIR common stockholders	$ 707,552	$ 1,897	$ 696,655	$ 616,351
Denominator:
Basic weighted-average common shares/units equivalents outstanding (in shares)	157,366	163,866	158,138	165,578
Dilutive common share/unit equivalents outstanding (in shares)	2,571	246	2,320	1,951
Dilutive weighted-average common shares/units outstanding (in shares)	159,937	164,112	160,458	167,529
Earnings per share/unit - basic (in dollars per share)	$ 4.49	$ 0.01	$ 4.38	$ 3.69
Earnings per share/unit - diluted (in dollars per share)	$ 4.42	$ 0.01	$ 4.34	$ 3.68