Segment Reporting - Summary of Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022		Mar. 31, 2021		Dec. 31, 2021
Segment Reporting Information [Line Items]
Total revenues		$ 81,507		$ 68,187
Depreciation and amortization		(33,713)		(30,640)
Property operating expenses, other operating and real estate taxes		(24,630)		(24,415)
General and administrative expenses		(11,937)		(8,992)
Gain on disposition of properties		28,815		4,612
Operating income		40,042		8,752
Interest and other income		2,935		1,700
Realized and unrealized holding gains (losses) on investments and other		15,730		5,125
Equity in (losses) earnings of unconsolidated affiliates		3,130		1,882
Interest expense		(17,925)		(16,614)
Income tax benefit (provision)		185		(148)
Net income		44,097		697
Net (income) loss attributable to noncontrolling interests		27,259		4,120
Net income attributable to Acadia		16,838		4,817
Real estate at cost	[1]	4,268,475		3,993,845
Total assets		4,496,181	[1]	4,093,757	[1]	$ 4,261,746
Cash paid for acquisition of real estate		159,599		0
Cash paid for development and property improvement costs		7,931		5,379
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Total revenues		48,350		42,349
Depreciation and amortization		(17,675)		(16,887)
Property operating expenses, other operating and real estate taxes		(14,639)		(13,657)
General and administrative expenses		0		0
Gain on disposition of properties		0		4,612
Operating income		16,036		16,417
Interest and other income		0		0
Realized and unrealized holding gains (losses) on investments and other		1,163		0
Equity in (losses) earnings of unconsolidated affiliates		1,617		(1,129)
Interest expense		(7,597)		(7,214)
Income tax benefit (provision)		0		0
Net income		11,219		8,074
Net (income) loss attributable to noncontrolling interests		(1,121)		(470)
Net income attributable to Acadia		10,098		7,604
Real estate at cost	[1]	2,511,417		2,319,584
Total assets	[1]	2,398,426		2,222,886
Cash paid for acquisition of real estate		159,599		0
Cash paid for development and property improvement costs		3,752		2,843
Operating Segments | Opportunity Funds
Segment Reporting Information [Line Items]
Total revenues		33,157		25,838
Depreciation and amortization		(16,038)		(13,753)
Property operating expenses, other operating and real estate taxes		(9,991)		(10,758)
General and administrative expenses		0		0
Gain on disposition of properties		28,815		0
Operating income		35,943		1,327
Interest and other income		0		0
Realized and unrealized holding gains (losses) on investments and other		14,567		6,547
Equity in (losses) earnings of unconsolidated affiliates		1,513		3,011
Interest expense		(10,328)		(9,400)
Income tax benefit (provision)		0		0
Net income		41,695		1,485
Net (income) loss attributable to noncontrolling interests		(26,138)		3,547
Net income attributable to Acadia		15,557		5,032
Real estate at cost	[1]	1,757,058		1,674,261
Total assets	[1]	1,944,594		1,771,411
Cash paid for acquisition of real estate		0		0
Cash paid for development and property improvement costs		4,179		2,536
Operating Segments | Structured Financing
Segment Reporting Information [Line Items]
Total revenues		0		0
Depreciation and amortization		0		0
Property operating expenses, other operating and real estate taxes		0		0
General and administrative expenses		0		0
Gain on disposition of properties		0		0
Operating income		0		0
Interest and other income		2,935		1,700
Realized and unrealized holding gains (losses) on investments and other		0		(1,422)
Equity in (losses) earnings of unconsolidated affiliates		0		0
Interest expense		0		0
Income tax benefit (provision)		0		0
Net income		2,935		278
Net (income) loss attributable to noncontrolling interests		0		1,043
Net income attributable to Acadia		2,935		1,321
Real estate at cost	[1]	0		0
Total assets	[1]	153,161		99,460
Cash paid for acquisition of real estate		0		0
Cash paid for development and property improvement costs		0		0
Unallocated
Segment Reporting Information [Line Items]
Total revenues		0		0
Depreciation and amortization		0		0
Property operating expenses, other operating and real estate taxes		0		0
General and administrative expenses		(11,937)		(8,992)
Gain on disposition of properties		0		0
Operating income		(11,937)		(8,992)
Interest and other income		0		0
Realized and unrealized holding gains (losses) on investments and other		0		0
Equity in (losses) earnings of unconsolidated affiliates		0		0
Interest expense		0		0
Income tax benefit (provision)		185		(148)
Net income		(11,752)		(9,140)
Net (income) loss attributable to noncontrolling interests		0		0
Net income attributable to Acadia		(11,752)		(9,140)
Real estate at cost	[1]	0		0
Total assets	[1]	0		0
Cash paid for acquisition of real estate		0		0
Cash paid for development and property improvement costs		$ 0		$ 0

[1] Real estate at cost and total assets for the Funds segment include $657.9 million and $643.0 million, or $191.1 million and $186.9 million net of non-controlling interests, related to Fund II’s City Point property at March 31, 2022 and 2021, respectively.