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RELATED PARTY TRANSACTIONS (Details) (Unconsolidated Affiliates, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Unconsolidated Affiliates
 
Related Party Transaction [Line Items]  
Revenue from related parties $ 0.1us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= akr_UnconsolidatedAffiliatesMember