CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Gains (losses) on disposition of properties	$ 0	$ 0	$ 15,336

Gain loss on disposition of property of equity method investment.

No definition available.

Name:	akr_GainLossOnDispositionOfPropertyOfEquityMethodInvestment
Namespace Prefix:	akr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration