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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 | $ 18,605,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 23,519,000 us-gaap_ProceedsFromIssuanceOfCommonStock |
Operating Partnership, as General Partner or Managing Member |  |  |
Noncontrolling Interest [Line Items] |  |  |
Limited partners' common OP units (in shares) | 2,975,277 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |  | 2,988,277 us-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) | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 188 us-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) | 600,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_AwardTypeAxis = akr_AtMarketEquityProgramMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Gross proceeds from issuance of common stock | 19,800,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_AwardTypeAxis = akr_AtMarketEquityProgramMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Proceeds from issuance of common stock | $ 19,500,000 us-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) | 937,651 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember |  | 675,367 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember

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