Federal Income Taxes - Income and Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
(Provision) benefit for income taxes:
Net (loss) income	$ (66,038)	$ 21,204	$ (15,698)
Noncontrolling interests	57,279	31,841	47,137
Net (loss) income attributable to Acadia	(8,759)	53,045	31,439
TRS [Member]
Income Tax Contingency [Line Items]
TRS loss before income taxes	(3,856)	(3,117)	(2,609)
(Provision) benefit for income taxes:
Federal	376	754	(377)
State and local	(268)	317	26
Net (loss) income	(3,748)	(2,046)	(2,960)
Noncontrolling interests	746	(369)	4
Net (loss) income attributable to Acadia	$ (3,002)	$ (2,415)	$ (2,956)