Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUES
Total revenues	$ 178,333	$ 181,643	$ 354,746	$ 367,686
OPERATING EXPENSES
Property operating expenses	64,758	63,959	129,375	129,921
Depreciation and amortization	75,791	78,949	151,071	160,395
General and administrative expenses	5,221	7,566	9,635	15,055
Other expenses, net	2,515	4,156	5,391	5,647
Total operating expenses	148,285	154,630	295,472	311,018
Interest income	15,684	2,303	31,656	6,292
Interest expense	(70,807)	(44,239)	(107,842)	(81,045)
Gain (loss) on derecognition of leased properties and dispositions of real estate, net	3,353	47,282	87,385	47,295
Mezzanine / Unconsolidated partnerships investment income, net	0	6,936	0	13,683
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	(21,722)	39,295	70,473	42,893
Income tax (expense) benefit			(1,045)	2,097
Income (loss) from continuing operations	(19,687)	40,078	69,428	44,990
Income from discontinued operations, net of tax	0	3,126	0	7,191
Net income (loss)	(19,687)	43,204	69,428	52,181
Noncontrolling interests:
Net (income) loss attributable to noncontrolling interests in consolidated real estate partnerships	2,397	17	2,632	(1)
Net income attributable to preferred noncontrolling interests in AIR Operating Partnership	(1,603)	(1,859)	(3,207)	(3,728)
Net (income) loss attributable to common noncontrolling interests in AIR Operating Partnership	945	(2,107)	(3,491)	(2,475)
Net (income) loss attributable to noncontrolling interests	1,739	(3,949)	(4,066)	(6,204)
Net income (loss) attributable to AIR/AIR Operating Partnership	(17,948)	39,255	65,362	45,977
Net income attributable to AIR preferred stockholders	(43)	0	(93)	0
Net income attributable to participating securities	(39)	(43)	(103)	(86)
Net income (loss) attributable to AIR common stockholders	$ (18,030)	$ 39,212	$ 65,166	$ 45,891
Earnings (loss) per common unit basic and diluted
Income (loss) from continuing operations attributable to AIR per common share	$ (0.12)	$ 0.30	$ 0.43	$ 0.32
Income from discontinued operations attributable to AIR per common share	0	0.03	0	0.06
Net income (loss) attributable to AIR per common share - basic and diluted	$ (0.12)	$ 0.33	$ 0.43	$ 0.38
Weighted average common shares/units outstanding - basic	154,608	119,959	151,609	119,953
Weighted average common shares/units outstanding - diluted	154,608	119,974	152,083	120,068
Continuing Operations [Member]
OPERATING EXPENSES
Income tax (expense) benefit	$ 2,035	$ 783	$ (1,045)	$ 2,097
Rental And Other Property Revenues [Member]
REVENUES
Total revenues	176,721	181,643	351,451	367,686
Other Revenues [Member]
REVENUES
Total revenues	1,612	0	3,295	0
Apartment Income REIT, L.P. [Member]
REVENUES
Total revenues	178,333	181,643	354,746	367,686
OPERATING EXPENSES
Property operating expenses	64,758	63,959	129,375	129,921
Depreciation and amortization	75,791	78,949	151,071	160,395
General and administrative expenses	5,221	7,566	9,635	15,055
Other expenses, net	2,515	4,156	5,391	5,647
Total operating expenses	148,285	154,630	295,472	311,018
Interest income	15,684	2,303	31,656	6,292
Interest expense	(70,807)	(44,239)	(107,842)	(81,045)
Gain (loss) on derecognition of leased properties and dispositions of real estate, net	3,353	47,282	87,385	47,295
Mezzanine / Unconsolidated partnerships investment income, net	0	6,936	0	13,683
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	(21,722)	39,295	70,473	42,893
Income tax (expense) benefit			(1,045)	2,097
Income (loss) from continuing operations	(19,687)	40,078	69,428	44,990
Income from discontinued operations, net of tax	0	3,126	0	7,191
Net income (loss)	(19,687)	43,204	69,428	52,181
Noncontrolling interests:
Net (income) loss attributable to noncontrolling interests in consolidated real estate partnerships	2,397	17	2,632	(1)
Net income attributable to preferred noncontrolling interests in AIR Operating Partnership	(1,646)	(1,859)	(3,300)	(3,728)
Net income (loss) attributable to AIR/AIR Operating Partnership	(17,290)	43,221	72,060	52,180
Net income attributable to participating securities	(39)	(43)	(103)	(86)
Net income (loss) attributable to AIR common stockholders	$ (18,975)	$ 41,319	$ 68,657	$ 48,366
Earnings (loss) per common unit basic and diluted
Income (loss) from continuing operations attributable to AIR per common share	$ (0.12)	$ 0.30	$ 0.43	$ 0.32
Income from discontinued operations attributable to AIR per common share	0	0.03	0	0.06
Net income (loss) attributable to AIR per common share - basic and diluted	$ (0.12)	$ 0.33	$ 0.43	$ 0.38
Weighted average common shares/units outstanding - basic	162,698	126,399	159,701	126,460
Weighted average common shares/units outstanding - diluted	162,698	126,414	160,175	126,636
Apartment Income REIT, L.P. [Member] | Continuing Operations [Member]
OPERATING EXPENSES
Income tax (expense) benefit	$ 2,035	$ 783	$ (1,045)	$ 2,097
Apartment Income REIT, L.P. [Member] | Rental And Other Property Revenues [Member]
REVENUES
Total revenues	176,721	181,643	351,451	367,686
Apartment Income REIT, L.P. [Member] | Other Revenues [Member]
REVENUES
Total revenues	$ 1,612	$ 0	$ 3,295	$ 0