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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Noncontrolling Interest [Line Items]      
Proceeds from issuance of common stock $ 18,605,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 23,519,000us-gaap_ProceedsFromIssuanceOfCommonStock  
Operating Partnership, as General Partner or Managing Member      
Noncontrolling Interest [Line Items]      
Limited partners' common OP units (in shares) 2,975,277us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember		   2,988,277us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
Series A Preferred Stock | Operating Partnership, as General Partner or Managing Member      
Noncontrolling Interest [Line Items]      
Limited partners' common OP units (in shares) 188us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		   188us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
At The Market Equity Program | Common stock      
Noncontrolling Interest [Line Items]      
Common stock issued during the period (in shares) 600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= akr_AtMarketEquityProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Gross proceeds from issuance of common stock 19,800,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_AwardTypeAxis
= akr_AtMarketEquityProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Proceeds from issuance of common stock $ 19,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_AwardTypeAxis
= akr_AtMarketEquityProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
LTIP Units      
Noncontrolling Interest [Line Items]      
Share-based compensation, outstanding (in shares) 937,651akr_ShareBasedCompensationUnitsOutstanding
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsMember		   675,367akr_ShareBasedCompensationUnitsOutstanding
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsMember