Segment Reporting - Summary of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 292,497		$ 250,908		$ 289,585
Depreciation and amortization	(123,439)		(147,229)		(122,580)
Property operating expenses, other operating and real estate taxes	(98,873)		(98,028)		(88,231)
General and administrative expenses	(40,125)		(35,798)		(34,299)
Impairment charges	(9,925)		(85,598)		(1,721)
Gain on disposition of properties	10,521		683		30,324
Operating income	30,656		(115,062)		73,078
Interest income	9,065		8,979		7,988
Equity in earnings of unconsolidated affiliates	5,330		(3,057)		5,899
Interest expense	(68,048)		(69,671)		(69,213)
Realized and unrealized holding gains (losses) on investments and other	49,120		113,362		6,947
Income tax provision	(93)		(269)		(1,465)
Net income (loss)	26,030		(65,718)		23,234
Net (income) loss attributable to noncontrolling interests	(2,482)		56,742		30,483
Net income (loss) attributable to Acadia	23,548		(8,976)		53,717
Real estate at cost	4,071,607	[1]	4,011,326	[1]	3,960,411
Total Assets	4,261,746	[1]	4,131,069	[1]	4,251,695
Cash paid for acquisition of real estate and leasehold interest	161,846		21,208		319,673
Cash paid for development and property improvement costs	40,671		36,579		89,385
Cash paid for acquisition of real estate					358,704
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Total revenues	181,332		160,262		173,177
Depreciation and amortization	(69,103)		(76,125)		(61,819)
Property operating expenses, other operating and real estate taxes	(56,957)		(57,246)		(47,032)
General and administrative expenses
Impairment charges	0		(419)		0
Gain on disposition of properties	4,612		174		16,771
Operating income	59,884		26,646		81,097
Interest income
Equity in earnings of unconsolidated affiliates	(353)		(874)		9,020
Interest expense	(29,454)		(33,185)		(28,304)
Realized and unrealized holding gains (losses) on investments and other			18,564		327
Income tax provision
Net income (loss)	30,783		11,151		62,140
Net (income) loss attributable to noncontrolling interests	(2,276)		(5,837)		337
Net income (loss) attributable to Acadia	28,507		5,314		62,477
Real estate at cost	2,356,645	[1]	2,330,116	[1]	2,252,230
Total Assets	2,212,877	[1]	2,254,680	[1]	2,350,833
Cash paid for acquisition of real estate and leasehold interest	26,176		19,963
Cash paid for development and property improvement costs	13,625		11,170		22,724
Cash paid for acquisition of real estate					173,892
Operating Segments | Opportunity Funds
Segment Reporting Information [Line Items]
Total revenues	111,165		90,646		116,408
Depreciation and amortization	(54,336)		(71,104)		(60,761)
Property operating expenses, other operating and real estate taxes	(41,916)		(40,782)		(41,199)
General and administrative expenses
Impairment charges	(9,925)		(85,179)		(1,721)
Gain on disposition of properties	5,909		509		13,553
Operating income	10,897		(105,910)		26,280
Interest income
Equity in earnings of unconsolidated affiliates	(4,977)		(2,183)		(3,121)
Interest expense	(38,594)		(36,486)		(40,909)
Realized and unrealized holding gains (losses) on investments and other	53,654		95,366		6,620
Income tax provision
Net income (loss)	(30,934)		(49,213)		(11,130)
Net (income) loss attributable to noncontrolling interests	(206)		62,579		30,146
Net income (loss) attributable to Acadia	30,728		13,366		19,016
Real estate at cost	1,714,962	[1]	1,681,210	[1]	1,708,181
Total Assets	1,894,983	[1]	1,775,507	[1]	1,785,919
Cash paid for acquisition of real estate and leasehold interest	135,670		1,245
Cash paid for development and property improvement costs	27,046		25,409		66,661
Cash paid for acquisition of real estate					184,812
Operating Segments | Structured Financing
Segment Reporting Information [Line Items]
Total revenues
Depreciation and amortization
Property operating expenses, other operating and real estate taxes
General and administrative expenses
Impairment charges	0		0		0
Gain on disposition of properties	0		0		0
Operating income
Interest income	9,065		8,979		7,988
Equity in earnings of unconsolidated affiliates
Interest expense
Realized and unrealized holding gains (losses) on investments and other	(4,534)		(568)
Income tax provision
Net income (loss)	4,531		8,411		7,988
Net (income) loss attributable to noncontrolling interests
Net income (loss) attributable to Acadia	4,531		8,411		7,988
Real estate at cost
Total Assets	153,886	[1]	100,882	[1]	114,943
Cash paid for acquisition of real estate and leasehold interest
Cash paid for development and property improvement costs
Cash paid for acquisition of real estate
Unallocated
Segment Reporting Information [Line Items]
Total revenues
Depreciation and amortization
Property operating expenses, other operating and real estate taxes
General and administrative expenses	40,125		(35,798)		(34,299)
Impairment charges	0		0		0
Gain on disposition of properties	0		0		0
Operating income	(40,125)		(35,798)		(34,299)
Interest income
Equity in earnings of unconsolidated affiliates
Interest expense
Realized and unrealized holding gains (losses) on investments and other
Income tax provision	(93)		(269)		(1,465)
Net income (loss)	(40,218)		(36,067)		(35,764)
Net (income) loss attributable to noncontrolling interests
Net income (loss) attributable to Acadia	(40,218)		(36,067)		(35,764)
Real estate at cost
Total Assets
Cash paid for acquisition of real estate and leasehold interest
Cash paid for development and property improvement costs
Cash paid for acquisition of real estate

[1] Real estate at cost and total assets for the Funds segment include $657.0 million and $641.7 million, or $190.9 million and $186.5 million net of non-controlling interests, related to Fund II’s City Point property at December 31, 2021 and 2020, respectively.