CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Gains (losses) on disposition of properties	$ 0	$ 11,846

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