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ORGANIZATION AND BASIS OF PRESENTATION (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2013
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Number of retail properties (in properties)   145us-gaap_NumberOfRealEstateProperties
Number of opportunity funds   4akr_NumberOfOpportunityFunds
Core Portfolio    
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Number of retail properties (in properties)   89us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember
Opportunity Funds    
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Number of retail properties (in properties)   56us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember
Fund II    
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Payments of dividends $ 47.1us-gaap_PaymentsOfDividends
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIiMember
 
Operating Partnership, as General Partner or Managing Member    
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Ownership interest by general partner or managing partner   95.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
Remaining funds rate of distribution to partnership   20.00%akr_RemainingFundsRateOfDistributionToPartnership
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
Institutional Investors [Member]    
Organization, Consolidation and Presentation of Financial Statements [Line Items]    
Remaining funds rate of distribution to all partners   80.00%akr_RemainingFundsRateOfDistributionToAllPartners
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_InstitutionalInvestorsMember