Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary information for the reportable segments
Total revenues		$ 773,723	$ 740,853	$ 719,556
Property operating expenses		261,264	268,101	249,036
Other operating expenses not allocated to segments	[1]	384,957	365,547	488,461
Total operating expenses		646,221	633,648	737,497
Proportionate property net operating income (loss)		127,502	107,205	(17,941)
Other items included in income before income tax benefit (expense)	[2]	846,471	366,773	(1,194)
Income (loss) from continuing operations before income tax benefit (expense) and discontinued operations		973,973	473,978	(19,135)
Segment Reconciling Items [Member]
Summary information for the reportable segments
Total revenues	[3]	81,204	78,938	40,929
Property operating expenses	[3]	40,555	39,768	28,115
Other operating expenses not allocated to segments	[1],[3]	0	0	0
Total operating expenses	[3]	40,555	39,768	28,115
Proportionate property net operating income (loss)	[3]	40,649	39,170	12,814
Other items included in income before income tax benefit (expense)	[2],[3]	0	0	0
Income (loss) from continuing operations before income tax benefit (expense) and discontinued operations	[3]	40,649	39,170	12,814
Corporate Non-Segment [Member]
Summary information for the reportable segments
Total revenues	[4]	47,517	122,083	119,710
Property operating expenses	[4]	45,428	74,506	61,961
Other operating expenses not allocated to segments	[1],[4]	384,957	365,547	488,461
Total operating expenses	[4]	430,385	440,053	550,422
Proportionate property net operating income (loss)	[4]	(382,868)	(317,970)	(430,712)
Other items included in income before income tax benefit (expense)	[2],[4]	846,471	366,773	(1,194)
Income (loss) from continuing operations before income tax benefit (expense) and discontinued operations	[4]	463,603	48,803	(431,906)
Same Store [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues		544,199	516,980	551,325
Property operating expenses		139,418	143,130	151,350
Other operating expenses not allocated to segments	[1]	0	0	0
Total operating expenses		139,418	143,130	151,350
Proportionate property net operating income (loss)		404,781	373,850	399,975
Other items included in income before income tax benefit (expense)	[2]	0	0	0
Income (loss) from continuing operations before income tax benefit (expense) and discontinued operations		404,781	373,850	399,975
Other Real Estate [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues		100,803	22,852	7,592
Property operating expenses		35,863	10,697	7,610
Other operating expenses not allocated to segments	[1]	0	0	0
Total operating expenses		35,863	10,697	7,610
Proportionate property net operating income (loss)		64,940	12,155	(18)
Other items included in income before income tax benefit (expense)	[2]	0	0	0
Income (loss) from continuing operations before income tax benefit (expense) and discontinued operations		$ 64,940	$ 12,155	$ (18)

[1] Includes depreciation and amortization, general and administrative expenses, and other expenses, net, and may also include provision for real estate impairment loss and write-offs of deferred leasing commissions, which are not included in our measure of segment performance.

[2] Includes gain on dispositions of real estate and derecognition of leased properties, interest income, interest expense, loss from unconsolidated real estate partnerships, and loss on extinguishment of debt.

[3] Represents adjustments to: (i) include AIR’s proportionate share of the results of unconsolidated apartment communities, which is excluded in the related consolidated amounts, and (ii) exclude the noncontrolling interests in consolidated real estate partnerships’ proportionate share of the results of communities in our segments, which is included in the related consolidated amounts. Also includes the reclassification of utility reimbursements from revenues to property operating expenses for the purpose of evaluating segment results. Utility reimbursements are included in rental and other property revenues in our consolidated statements of operations prepared in accordance with GAAP. Effective in 2022, corporate and amounts not allocated to segments includes the depreciation of capitalized costs of non-real estate assets.

[4] Includes the operating results of apartment communities sold during the periods shown or held for sale at the end of the period, if any. Also includes property management revenues, which are not part of our segment performance measure and property management expenses and casualty gains and losses, which are included in consolidated property operating expenses and are not part of our segment performance measure. The write-off of straight-line rent receivables, recognized due to the impact of COVID-19 and the resulting economic impact on our commercial tenants, are included in consolidated rental and property revenues and are not included in our measurement of segment performance for the year ended December 31, 2020.