Earnings Per Share - Summary of Elements Used in Calculating Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator – basic and diluted earnings per share:
Net (loss) income	$ (15,422)	$ 10,210	$ 66,639	$ 41,578
Net loss (income) attributable to noncontrolling interests – partially owned properties	2,078	176	872	(1,552)
Net (loss) income attributable to ACC, Inc. and Subsidiaries common stockholders	(13,344)	10,386	67,511	40,026
Amount allocated to participating securities	(519)	(458)	(1,181)	(1,031)
Net (loss) income	$ (13,863)	$ 9,928	$ 66,330	$ 38,995
Denominator:
Basic weighted average common shares outstanding (in shares)	137,613,560	137,268,696	137,545,365	137,185,576
Diluted weighted average common shares outstanding (in shares)	137,613,560	138,243,388	138,652,106	138,198,134
Earnings per share:
Net (loss) income attributable to common stockholders - basic and diluted (in dollars per share)	$ (0.10)	$ 0.07	$ 0.48	$ 0.28
Unvested restricted stock awards
Denominator:
Unvested restricted stock awards (in shares)	0	974,692	1,106,741	1,012,558