Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net income attributable to Acadia	$ (8,759)	$ 53,045	$ 31,439
Real estate at cost	4,094,288	4,039,536	3,697,805
Total Assets	4,186,882	4,309,114	3,958,780
Net (income) loss attributable to noncontrolling interests	(57,279)	(31,841)	(47,137)
Funds | Fund II's City Point Property
Segment Reporting Information [Line Items]
Real estate at cost	641,700
Total Assets	603,300
Net (income) loss attributable to noncontrolling interests	186,500	174,700
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Net income attributable to Acadia	5,314	62,477	42,445
Real estate at cost	2,330,116	2,252,230	2,069,439
Total Assets	2,254,680	2,350,833	2,232,695
Net (income) loss attributable to noncontrolling interests	5,837	(337)	(752)
Operating Segments | Core Portfolio | Town Center
Segment Reporting Information [Line Items]
Net income attributable to Acadia	2,200	4,700	4,100
Operating Segments | Funds
Segment Reporting Information [Line Items]
Net income attributable to Acadia	13,274	19,464	11,040
Real estate at cost	1,764,172	1,787,306	1,628,366
Total Assets	1,830,752	1,843,338	1,616,472
Net (income) loss attributable to noncontrolling interests	$ (63,116)	$ (31,504)	$ (46,385)