Condensed Consolidated Statements of Partners' Capital - USD ($) $ in Thousands	Total	Apartment Income REIT, L.P. [Member]	Apartment Income REIT, L.P. [Member] Cumulative Effect, Period of Adoption, Adjustment	Apartment Income REIT, L.P. [Member] Preferred Units [Member]	Apartment Income REIT, L.P. [Member] General Partner and Special Limited Partner [Member]	Apartment Income REIT, L.P. [Member] General Partner and Special Limited Partner [Member] Cumulative Effect, Period of Adoption, Adjustment	Apartment Income REIT, L.P. [Member] Limited Partners [Member]	Apartment Income REIT, L.P. [Member] Partners Capital Attributable To The Partnership [Member]	Apartment Income REIT, L.P. [Member] Partners Capital Attributable To The Partnership [Member] Cumulative Effect, Period of Adoption, Adjustment	Apartment Income REIT, L.P. [Member] Noncontrolling Interest in Consolidated Real Estate Partnerships
Balances at Dec. 31, 2019		$ 1,860,795	$ (277)		$ 1,780,649	$ (277)	$ 83,442	$ 1,864,091	$ (277)	$ (3,296)
Increase (Decrease) in Partners' Capital [Roll Forward]
Repurchases of common partnership units		(10,004)			(10,004)			(10,004)
Redemption of AIR Operating Partnership units	$ 1,740	484						484
Redemption of common partnership units		(1,739)			5,137		(6,876)	(1,739)
Amortization of share-based compensation cost		7,065			3,911		3,154	7,065
Effect of changes in ownership of consolidated entities		(447,688)			(504,361)		(4,647)	(509,008)		61,320
Contribution from noncontrolling interest in consolidated real estate partnerships	4,701	4,701								4,701
Change in accumulated other comprehensive income (loss)	(658)	(658)			(616)		(42)	(658)
Net income (loss)	22,298	22,298			20,970		1,134	22,104		194
Distributions to common unitholders		(192,734)			(182,893)		(9,841)	(192,734)
Distributions to noncontrolling interests	(10,019)	(178)								(178)
Other, net		(160)			153			153		(313)
Balances at Sep. 30, 2020		2,136,797			2,121,391		75,618	2,197,009		(60,212)
Balances at Jun. 30, 2020		1,774,236			1,698,012		79,414	1,777,426		(3,190)
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption of AIR Operating Partnership units	484						484
Amortization of share-based compensation cost		1,954			902		1,052	1,954
Effect of changes in ownership of consolidated entities		(447,688)			(508,709)		(335)	(509,044)		61,356
Contribution from noncontrolling interest in consolidated real estate partnerships	4,701	4,701								4,701
Change in accumulated other comprehensive income (loss)	(243)	(243)			(228)		(15)	(243)
Net income (loss)	(26,379)	(26,379)			(25,007)		(1,341)	(26,348)		(31)
Distributions to common unitholders		(64,377)			(61,034)		(3,343)	(64,377)
Distributions to noncontrolling interests	(3,413)	(70)								(70)
Other, net		(229)			37			37		(266)
Balances at Sep. 30, 2020		2,136,797			2,121,391		75,618	2,197,009		(60,212)
Balances at Dec. 31, 2020		1,308,093		$ 2,000	1,304,851		63,185	1,370,036		(61,943)
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of common partnership units to AIR		342,132			342,132			342,132
Redemption of AIR Operating Partnership units	(3,977)	(3,977)			(8,240)		(12,217)	(3,977)
Amortization of share-based compensation cost		5,928			2,953		2,975	5,928
Effect of changes in ownership of consolidated entities		230			(9,846)		10,076	230
Contribution from noncontrolling interest in consolidated real estate partnerships	6,126	6,126								6,126
Change in accumulated other comprehensive income (loss)	(3,251)	(3,251)			(3,039)		(212)	(3,251)
Net income (loss)	75,289	75,289			74,740		3,966	78,706		(3,417)
Distributions to common unitholders		(211,011)			(200,327)		(10,684)	(211,011)
Distributions paid to preferred unitholders		136			136			136
Distributions to noncontrolling interests	(19,428)	(8,744)								(8,744)
Other, net		(1,744)			(1,624)			(1,624)		(120)
Balances at Sep. 30, 2021		1,508,935		2,000	1,517,944		57,089	1,577,033		(68,098)
Balances at Jun. 30, 2021		1,571,756		2,000	1,576,899		60,388	1,639,287		(67,531)
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of common partnership units to AIR		(31)			(31)			(31)
Redemption of AIR Operating Partnership units	425	(425)			(6,283)		6,708	(425)
Amortization of share-based compensation cost		1,401			409		992	1,401
Effect of changes in ownership of consolidated entities		230			(5,423)		5,653	230
Contribution from noncontrolling interest in consolidated real estate partnerships	4,128	4,128								4,128
Net income (loss)	9,068	9,068			9,378		475	9,853		(785)
Distributions to common unitholders		(72,532)			(69,051)		(3,481)	(72,532)
Distributions paid to preferred unitholders		43			43			43
Distributions to noncontrolling interests	$ (7,391)	(3,910)								(3,910)
Other, net		(707)			(477)		(230)	(707)
Balances at Sep. 30, 2021		$ 1,508,935		$ 2,000	$ 1,517,944		$ 57,089	$ 1,577,033		$ (68,098)