CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Gains (losses) on disposition of properties	$ 0	$ (726)	$ 14,771	$ (726)

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