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	$ 1,255
Redemption of common partnership units		(1,255)			5,137		(6,392)	(1,255)
Amortization of share-based compensation cost		5,111			3,009		2,102	5,111
Effect of changes in ownership of consolidated entities					(4,348)		4,312	(36)		36
Change in accumulated other comprehensive income (loss)	(415)	(415)			(388)		(27)	(415)
Net income (loss)	48,677	48,677			45,977		2,475	48,452		225
Distributions to common unitholders		(128,357)			(121,859)		(6,498)	(128,357)
Distributions to noncontrolling interests	(6,606)	(108)								(108)
Other, net		69			116			116		(47)
Balances at Jun. 30, 2020		1,774,236			1,698,012		79,414	1,777,426		(3,190)
Balances at Mar. 31, 2020		1,795,548			1,717,455		81,502	1,798,957		(3,409)
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption of AIR Operating Partnership units	(286)	(286)			5,137		(5,423)	(286)
Amortization of share-based compensation cost		2,131			1,080		1,051	2,131
Effect of changes in ownership of consolidated entities					(3,579)		3,543	(36)		36
Change in accumulated other comprehensive income (loss)	(355)	(355)			(332)		(23)	(355)
Net income (loss)	41,469	41,469			39,255		2,107	41,362		107
Distributions to common unitholders		(64,377)			(61,034)		(3,343)	(64,377)
Distributions to noncontrolling interests	(3,378)	(35)								(35)
Other, net		141			30			30		111
Balances at Jun. 30, 2020		1,774,236			1,698,012		79,414	1,777,426		(3,190)
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		342,163			342,163			342,163
Redemption of AIR Operating Partnership units	(3,552)	(3,552)			1,957		(5,509)	(3,552)
Amortization of share-based compensation cost		4,527			2,544		1,983	4,527
Effect of changes in ownership of consolidated entities					(4,423)		4,423
Contribution from noncontrolling interest in consolidated real estate partnerships	1,998	1,998								1,998
Change in accumulated other comprehensive income (loss)	(3,251)	(3,251)			(3,039)		(212)	(3,251)
Net income (loss)	66,221	66,221			65,362		3,491	68,853		(2,632)
Distributions to common unitholders		(138,479)			(131,276)		(7,203)	(138,479)
Distributions paid to preferred unitholders		(93)			(93)		0	(93)
Distributions to noncontrolling interests	(12,037)	(4,834)								(4,834)
Other, net		(1,037)			(1,147)		230	(917)		(120)
Balances at Jun. 30, 2021		1,571,756		2,000	1,576,899		60,388	1,639,287		(67,531)
Balances at Mar. 31, 2021		1,322,096		2,000	1,320,903		63,812	1,386,715		(64,619)
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of common partnership units to AIR		342,163			342,163			342,163
Redemption of AIR Operating Partnership units	(329)	(329)			1,957		(2,286)	(329)
Amortization of share-based compensation cost		1,889			629		1,260	1,889
Effect of changes in ownership of consolidated entities		0			(1,833)		1,833	0
Contribution from noncontrolling interest in consolidated real estate partnerships	1,998	1,998								1,998
Change in accumulated other comprehensive income (loss)	(1,180)	(1,180)			(1,100)		(80)	(1,180)
Net income (loss)	21,290	(21,290)			(17,948)		(945)	(18,893)		(2,397)
Distributions to common unitholders		(70,854)			(67,418)		(3,436)	(70,854)
Distributions paid to preferred unitholders		(43)			(43)			(43)
Distributions to noncontrolling interests	$ (6,868)	(3,432)								(3,432)
Other, net		738			(411)			(181)		919
Balances at Jun. 30, 2021		$ 1,571,756		$ 2,000	$ 1,576,899		$ 60,388	$ 1,639,287		$ (67,531)