Federal Income Taxes - Reconciliation of Net Income to Taxable Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net income attributable to Acadia	$ (8,759)	$ 53,045	$ 31,439
Deferred cancellation of indebtedness income	0	0	2,050
Deferred rental and other income	(2,498)	1,203	1,222
Book/tax difference - depreciation and amortization	27,052	21,688	23,166
Straight-line rent and above- and below-market rent adjustments	8,630	(10,949)	(12,129)
Book/tax differences - equity-based compensation	6,825	7,177	6,042
Joint venture equity in earnings, net	(163)	15,571	13,905
Impairment charges and reserves	18,734	0	0
Acquisition costs	14	63	326
Gain on disposition of properties	4,936	2,375	0
Book/tax differences - miscellaneous	(253)	(1,473)	(2,821)
Taxable income	54,518	88,700	63,200
Distributions declared	$ 24,937	$ 96,310	$ 89,122