Earnings Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net (loss) income attributable to Acadia		$ (55,891)	$ 12,007	$ (39,427)	$ 20,535
Less: net income attributable to participating securities		(198)	(156)	0	(468)
(Loss) income from continuing operations net of income attributable to participating securities for basic (loss) earnings per share		(56,089)	11,851	(39,427)	20,067
Impact of City Point Loan share conversion option	[1]	(1,804)	0	(1,804)	0
(Loss) income from continuing operations net of income attributable to participating securities for diluted (loss) earnings per share		$ (57,893)	$ 11,851	$ (41,231)	$ 20,067
Denominator:
Weighted average shares for basic earnings per share		94,980,333	88,480,844	94,757,678	87,217,422
Effect of dilutive securities:
Series A Preferred OP Units		0	0	0	0
Employee unvested restricted shares		0	0	0	0
City Point Loan common stock conversion option	[1]	270,635	0	91,203	0
Denominator for diluted earnings per share		95,250,968	88,480,844	94,848,881	87,217,422
Basic (loss) earnings per Common Share from continuing operations attributable to Acadia		$ (0.59)	$ 0.13	$ (0.42)	$ 0.23
Diluted (loss) earnings per Common Share from continuing operations attributable to Acadia		$ (0.61)	$ 0.13	$ (0.43)	$ 0.23
Series A Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		188	188	188	188
Series A Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		25,067	25,067	25,067	25,067
Series C Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		126,593	126,593	126,593	126,593
Series C Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		439,556	439,556	439,556	439,556
Restricted shares
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		69,832	70,827	69,832	70,827

[1] The impact of assumed conversion of dilutive convertible securities is related to the assumed conversion of potential common shares of the Company that could be subsequently issued in connection with the City Point Loan (Note 10) for the stub-period until the put rights were modified for a cash-only settlement option in the third quarter of 2022.