Summary of Quarterly Financial Information (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) property $ / shares shares	Sep. 30, 2018 USD ($) property $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) property $ / shares shares	Sep. 30, 2017 USD ($) property $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) property $ / shares shares	Dec. 31, 2018 USD ($) property $ / shares shares	Dec. 31, 2017 USD ($) property $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Interim Period, Costs Not Allocable [Line Items]
Revenues	$ 69,445	$ 66,075	$ 63,569	$ 63,124	$ 66,081	$ 62,678	$ 59,504	$ 61,999	$ 262,213	$ 250,262	$ 189,939
Net (loss) income	(6,671)	(2,597)	(2,270)	(4,160)	24,944	13,285	6,108	19,971	(15,698)	64,308	134,592
Net loss attributable to noncontrolling interests	13,801	11,822	9,935	11,579	(4,032)	(418)	5,952	(4,340)	(47,137)	2,838	61,816
Net income attributable to Acadia	$ 7,130	$ 9,225	$ 7,665	$ 7,419	$ 20,912	$ 12,867	$ 12,060	$ 15,631	$ 31,439	$ 61,470	$ 72,776
Basic (in dollars per share) | $ / shares	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.25	$ 0.15	$ 0.14	$ 0.18
Diluted (in dollars per share) | $ / shares	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.25	$ 0.15	$ 0.14	$ 0.18
Weighted average number of shares: Basic | shares	81,591	81,566	81,756	83,434	83,733	83,700	83,662	83,635
Weighted average number of shares: Diluted | shares	81,591	81,566	81,756	83,438	83,733	83,700	83,662	83,646	82,080,159	83,685,471	76,243,550
Dividend per common share | $ / shares	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Number of retail properties | property	171								171
Impairment charges					$ 10,600	$ 3,800			$ 0	$ 14,455	$ 0
Gain on change in control and other					5,600
Noncontrolling Interests
Interim Period, Costs Not Allocable [Line Items]
Net (loss) income									$ (47,137)	$ 2,838	$ 61,816
Impairment charges					7,600	2,700
Disposed of by sale
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal		$ 5,100			$ 35,900	$ 13,000	$ 3,300	$ 14,500
Number of retail properties | property		2			3	2		2		3
Disposed of by sale | Partnership Interest
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal							$ 800	$ 2,700
Disposed of by sale | Noncontrolling Interests
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal		$ 3,900			$ 26,700	$ 10,700