Segment Reporting - Summary of Segment Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 255,484,000	$ 295,327,000	$ 259,681,000
Depreciation and amortization	(149,793,000)	(125,443,000)	(117,549,000)
Property operating expenses, other operating and real estate taxes	(100,100,000)	(90,468,000)	(80,248,000)
General and administrative expenses	(36,055,000)	(35,416,000)	(34,343,000)
Impairment charges	(85,598,000)	(1,721,000)
Gain on disposition of properties	683,000	30,324,000	5,140,000
Operating (loss) income	(115,379,000)	72,603,000	32,681,000
Interest income	8,979,000	7,988,000	13,231,000
Equity in earnings (losses) of unconsolidated affiliates inclusive of gains on disposition of properties	(1,237,000)	8,922,000	9,302,000
Interest expense	(72,060,000)	(73,788,000)	(69,978,000)
Gain (loss) on investment	113,930,000	6,947,000
Income tax provision	(271,000)	(1,468,000)	(934,000)
Net (loss) income	(66,038,000)	21,204,000	(15,698,000)
Net loss attributable to noncontrolling interests	57,279,000	31,841,000	47,137,000
Net (loss) income attributable to Acadia	(8,759,000)	53,045,000	31,439,000
Real estate at cost	4,094,288,000	4,039,536,000	3,697,805,000
Total Assets	4,186,882,000	4,309,114,000	3,958,780,000
Cash paid for acquisition of real estate and leasehold interest	21,208,000	319,673,000	147,985,000
Cash paid for development and property improvement costs	40,483,000	89,270,000	94,834,000
Cash paid for acquisition of real estate		358,704,000
Core Portfolio
Segment Reporting Information [Line Items]
Gain (loss) on investment	0
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Total revenues	160,262,000	173,177,000	166,816,000
Depreciation and amortization	(76,125,000)	(61,819,000)	(60,903,000)
Property operating expenses, other operating and real estate taxes	(57,246,000)	(47,032,000)	(44,060,000)
General and administrative expenses	0	0	0
Impairment charges	(419,000)	0
Gain on disposition of properties	174,000	16,771,000	0
Operating (loss) income	26,646,000	81,097,000	61,853,000
Interest income	0	0	0
Equity in earnings (losses) of unconsolidated affiliates inclusive of gains on disposition of properties	(874,000)	9,020,000	7,415,000
Interest expense	(33,185,000)	(28,304,000)	(27,575,000)
Gain (loss) on investment	18,564,000	327,000
Income tax provision	0	0	0
Net (loss) income	11,151,000	62,140,000	41,693,000
Net loss attributable to noncontrolling interests	(5,837,000)	337,000	752,000
Net (loss) income attributable to Acadia	5,314,000	62,477,000	42,445,000
Real estate at cost	2,330,116,000	2,252,230,000	2,069,439,000
Total Assets	2,254,680,000	2,350,833,000	2,232,695,000
Cash paid for acquisition of real estate and leasehold interest	19,963,000		1,343,000
Cash paid for development and property improvement costs	11,170,000	22,724,000	32,662,000
Cash paid for acquisition of real estate		173,892,000
Operating Segments | Opportunity Funds
Segment Reporting Information [Line Items]
Total revenues	95,222,000	122,150,000	92,865,000
Depreciation and amortization	(73,668,000)	(63,624,000)	(56,646,000)
Property operating expenses, other operating and real estate taxes	(42,854,000)	(43,436,000)	(36,188,000)
General and administrative expenses	0	0	0
Impairment charges	(85,179,000)	(1,721,000)
Gain on disposition of properties	509,000	13,553,000	5,140,000
Operating (loss) income	(105,970,000)	26,922,000	5,171,000
Interest income	0	0	0
Equity in earnings (losses) of unconsolidated affiliates inclusive of gains on disposition of properties	(363,000)	(98,000)	1,887,000
Interest expense	(38,875,000)	(45,484,000)	(42,403,000)
Gain (loss) on investment	95,366,000	6,620,000
Income tax provision	0	0	0
Net (loss) income	(49,842,000)	(12,040,000)	(35,345,000)
Net loss attributable to noncontrolling interests	63,116,000	31,504,000	46,385,000
Net (loss) income attributable to Acadia	13,274,000	19,464,000	11,040,000
Real estate at cost	1,764,172,000	1,787,306,000	1,628,366,000
Total Assets	1,830,752,000	1,843,338,000	1,616,472,000
Cash paid for acquisition of real estate and leasehold interest	1,245,000		146,642,000
Cash paid for development and property improvement costs	29,313,000	66,546,000	62,172,000
Cash paid for acquisition of real estate		184,812,000
Operating Segments | Structured Financing
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Depreciation and amortization	0	0	0
Property operating expenses, other operating and real estate taxes	0	0	0
General and administrative expenses	0	0	0
Impairment charges	0	0
Gain on disposition of properties	0	0	0
Operating (loss) income	0	0	0
Interest income	8,979,000	7,988,000	13,231,000
Equity in earnings (losses) of unconsolidated affiliates inclusive of gains on disposition of properties	0	0	0
Interest expense	0	0	0
Gain (loss) on investment	0	0
Income tax provision	0	0	0
Net (loss) income	8,979,000	7,988,000	13,231,000
Net loss attributable to noncontrolling interests	0	0	0
Net (loss) income attributable to Acadia	8,979,000	7,988,000	13,231,000
Real estate at cost	0	0	0
Total Assets	101,450,000	114,943,000	109,613,000
Cash paid for acquisition of real estate and leasehold interest	0		0
Cash paid for development and property improvement costs	0	0	0
Cash paid for acquisition of real estate		0
Unallocated
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Depreciation and amortization	0	0	0
Property operating expenses, other operating and real estate taxes	0	0	0
General and administrative expenses	(36,055,000)	(35,416,000)	(34,343,000)
Impairment charges	0	0
Gain on disposition of properties	0	0	0
Operating (loss) income	(36,055,000)	(35,416,000)	(34,343,000)
Interest income	0	0	0
Equity in earnings (losses) of unconsolidated affiliates inclusive of gains on disposition of properties	0	0	0
Interest expense	0	0	0
Gain (loss) on investment	0	0
Income tax provision	(271,000)	(1,468,000)	(934,000)
Net (loss) income	(36,326,000)	(36,884,000)	(35,277,000)
Net loss attributable to noncontrolling interests	0	0	0
Net (loss) income attributable to Acadia	(36,326,000)	(36,884,000)	(35,277,000)
Real estate at cost	0	0	0
Total Assets	0	0	0
Cash paid for acquisition of real estate and leasehold interest	0		0
Cash paid for development and property improvement costs	$ 0	0	$ 0
Cash paid for acquisition of real estate		$ 0