Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 80,099	$ 27,366
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	232,192	239,659
Gain on derecognition of leased properties and dispositions of real estate	(94,512)	(47,295)
Income tax expense (benefit)	770	(1,678)
Other non-cash adjustments, net	10,645	10,988
Net changes in operating assets and operating liabilities	(41,286)	(14,458)
Loss on extinguishment of debt	44,833
Net cash provided by operating activities	232,741	265,876
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(225,526)	(6,287)
Capital expenditures	(130,877)	(256,952)
Proceeds from dispositions of real asset	45,752	36,869
Purchases of corporate assets	(4,915)	(13,539)
Maturation of debt investments	100,852
Other investing activities	(35,877)	(8,457)
Net cash used in investing activities	(250,591)	(355,969)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt		608,756
Principal repayments on non-recourse property debt	(618,111)	(659,538)
Proceeds from term loan	1,150,000	350,000
Repayment of term loan	(350,000)
Net repayments of revolving credit facility	(206,144)	(275,000)
Payment of debt issuance costs	(11,124)	(7,197)
Payment of debt extinguishment costs	(42,760)	(11,792)
Repurchases of common stock or common units		(10,004)
Proceeds from Issuance of Common Stock, net	342,132
Payment of dividends to holders of Common Stock	(200,624)	(183,003)
Payment of dividends to holders of Preferred Stock	(122)
Payment of distributions to noncontrolling interests	(24,287)	(15,863)
Redemptions of noncontrolling interests in the AIR Operating Partnership	(4,045)	(19,355)
Contribution from noncontrolling interests in consolidated real estate partnerships	6,126	463,523
Other financing activities	456	(14,980)
Net cash provided by financing activities	41,497	180,882
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	23,647	90,789
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF DISCONTINUED OPERATIONS		1,995
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF CONTINUING OPERATIONS	23,647	92,784
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	73,480	166,541
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	97,127	259,325
Apartment Income REIT, L.P [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	80,099	27,366
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	232,192	239,659
Gain on derecognition of leased properties and dispositions of real estate	(94,512)	(47,295)
Income tax expense (benefit)	770	(1,678)
Other non-cash adjustments, net	10,645	10,988
Net changes in operating assets and operating liabilities	(41,286)	(14,458)
Loss on extinguishment of debt	44,833
Net cash provided by operating activities	232,741	265,876
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(225,526)	(6,287)
Capital expenditures	(130,877)	(256,952)
Proceeds from dispositions of real asset	45,752	36,869
Purchases of corporate assets	(4,915)	(13,539)
Maturation of debt investments	100,852
Other investing activities	(35,877)	(8,457)
Net cash used in investing activities	(250,591)	(355,969)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt		608,756
Principal repayments on non-recourse property debt	(618,111)	(659,538)
Proceeds from term loan	1,150,000	350,000
Repayment of term loan	(350,000)
Net repayments of revolving credit facility	(206,144)	(275,000)
Payment of debt issuance costs	(11,124)	(7,197)
Payment of debt extinguishment costs	(42,760)	(11,792)
Repurchases of common stock or common units		(10,004)
Proceeds from Issuance of Common Stock, net	342,132
Payment of distributions to General Partner and Special Limited Partner	(200,624)	(183,003)
Payment of distributions to Limited Partners	(10,739)	(10,136)
Redemption of common and preferred units	(4,045)	(19,355)
Contribution from noncontrolling interests in consolidated real estate partnerships	6,126	463,523
Other financing activities	456	(14,980)
Net cash provided by financing activities	41,497	180,882
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	23,647	90,789
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF DISCONTINUED OPERATIONS		1,995
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF CONTINUING OPERATIONS	23,647	92,784
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	73,480	166,541
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	97,127	259,325
Discontinued Operations [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		56,755
Income tax expense (benefit)		(6,181)
Other non-cash adjustments, net		720
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate		(92,286)
Capital expenditures		(15,317)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal repayments on non-recourse property debt		(42,816)
Other financing activities		(1,849)
Discontinued Operations [Member] | Apartment Income REIT, L.P [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	0	56,755
Income tax expense (benefit)	0	(6,181)
Other non-cash adjustments, net	0	720
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate		(92,286)
Capital expenditures		(15,317)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal repayments on non-recourse property debt		(42,816)
Payment of dividends to holders of Preferred Stock	(4,932)	(5,415)
Payment of distributions to noncontrolling interests	(8,738)	(312)
Other financing activities		$ (1,849)