Federal Income Taxes - Reconciliation of Net Income to Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Required Distribution Rate to Maintain REIT Status	90.00%								90.00%
Net income attributable to Acadia	$ 19,821	$ 6,112	$ 17,918	$ 28,925	$ 8,890	$ 13,776	$ 26,495	$ 16,547	$ 72,776	$ 65,708	$ 71,064
Deferred cancellation of indebtedness income									2,050	2,050	2,050
Deferred rental and other income									1,610	82	2,120
Book/tax difference - depreciation and amortization									15,189	9,983	7,337
Straight-line rent and above- and below-market rent adjustments									(7,882)	(8,041)	(4,917)
Book/tax differences - equity-based compensation									10,307	5,833	4,540
Taxable Income Reconciliation, Joint Venture Equity In Earnings									(2,011)	5,776	(105)
Impairment charges and reserves									769	(714)	3,735
Acquisition costs									5,116	1,190	4,505
Gains									0	(760)	(11,663)
Book/tax differences - miscellaneous									(4,924)	2,573	(6,041)
Taxable income									93,000	83,680	72,625
Distributions declared									$ 91,053	$ 84,683	$ 77,194