Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 69,428	$ 52,181
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	151,071	160,395
Gain on derecognition of leased properties and dispositions of real estate	(87,385)	(47,295)
Income tax expense (benefit)	1,045	(2,097)
Other non-cash adjustments, net	9,314	7,059
Net changes in operating assets and operating liabilities	(49,676)	(20,084)
Net cash (used in) provided by operating activities	93,797	184,357
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(225,526)	(3,064)
Capital expenditures	(76,469)	(171,627)
Proceeds from dispositions of real asset	6,230	36,869
Purchases of corporate assets	(4,509)	(8,743)
Maturation of debt investments	100,852	0
Other investing activities	(61)	1,946
Net cash provided by (used in) investing activities	(199,483)	(160,070)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	0	608,756
Principal repayments on non-recourse property debt	(566,523)	(269,434)
Proceeds from term loan	800,000	350,000
Repayment of term loan	(350,000)	0
Net borrowings on (repayments of) revolving credit facility	81,600	(275,000)
Payment of debt issuance costs	(9,885)	(6,007)
Payment of debt extinguishment costs	(36,198)	(5,758)
Repurchases of common stock or common units	0	(10,004)
Proceeds from Issuance of Common Stock, net	342,163	0
Payment of dividends to holders of Common Stock	(131,654)	(122,058)
Payment of dividends to holders of Preferred Stock	(93)
Payment of distributions to noncontrolling interests	(15,301)	(10,639)
Redemptions of noncontrolling interests in the AIR Operating Partnership	(3,622)	(1,870)
Contribution from noncontrolling interests in consolidated real estate partnerships	1,998	0
Other financing activities	422	(12,554)
Net cash provided by financing activities	112,907	240,519
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	7,221	264,806
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF DISCONTINUED OPERATIONS	0	1,190
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF CONTINUING OPERATIONS	7,221	265,996
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	73,480	166,541
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	80,701	432,537
Apartment Income REIT, L.P [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	69,428	52,181
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	151,071	160,395
Gain on derecognition of leased properties and dispositions of real estate	(87,385)	(47,295)
Income tax expense (benefit)	1,045	(2,097)
Other non-cash adjustments, net	9,314	7,059
Net changes in operating assets and operating liabilities	(49,676)	(20,084)
Net cash (used in) provided by operating activities	93,797	184,357
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(225,526)	(3,064)
Capital expenditures	(76,469)	(171,627)
Proceeds from dispositions of real asset	6,230	36,869
Purchases of corporate assets	(4,509)	(8,743)
Maturation of debt investments	100,852	0
Other investing activities	(61)	1,946
Net cash provided by (used in) investing activities	(199,483)	(160,070)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	0	608,756
Principal repayments on non-recourse property debt	(566,523)	(269,434)
Proceeds from term loan	800,000	350,000
Repayment of term loan	(350,000)	0
Net borrowings on (repayments of) revolving credit facility	81,600	(275,000)
Payment of debt issuance costs	(9,885)	(6,007)
Payment of debt extinguishment costs	(36,198)	(5,758)
Repurchases of common stock or common units	0	(10,004)
Proceeds from Issuance of Common Stock, net	342,163	0
Payment of distributions to General Partner and Special Limited Partner	(131,654)	(122,058)
Payment of distributions to Limited Partners	(7,258)	(6,793)
Contribution from noncontrolling interests in consolidated real estate partnerships	1,998	0
Redemption of common and preferred units	(3,622)	(1,870)
Other financing activities	422	(12,554)
Net cash provided by financing activities	112,907	240,519
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	7,221	264,806
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF DISCONTINUED OPERATIONS	0	1,190
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH OF CONTINUING OPERATIONS	7,221	265,996
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	73,480	166,541
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	80,701	432,537
Discontinued Operations [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	0	37,770
Income tax expense (benefit)	0	(4,015)
Other non-cash adjustments, net	0	443
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	0	(4,730)
Capital expenditures	0	(10,721)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal repayments on non-recourse property debt	0	(4,913)
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	37,770
Income tax expense (benefit)	0	(4,015)
Other non-cash adjustments, net	0	443
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	0	(4,730)
Capital expenditures	0	(10,721)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal repayments on non-recourse property debt	0	(4,913)
Payment of dividends to holders of Preferred Stock	(3,300)	(3,728)
Payment of distributions to noncontrolling interests	$ (4,836)	$ (118)