CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Gains (losses) on disposition of properties	$ 15,336	$ 35,950	$ 24,043

Gain (Loss) On Disposition Of Property Of Equity Method Investment

No definition available.

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