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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Common Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 12,237,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,013,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,510,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) | 136,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 93,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 334,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
ATM Equity Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of common stock | 127.1 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember |  | 140.8 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember
ATM Equity Program [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 4,400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember | 3,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember | 6,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember
Proceeds from issuance of common stock |  | 80.7 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_AtMarketEquityProgramMember |
Public Offering [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of common stock | 230.7 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = akr_PublicOfferingMember |  | 85.9 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = akr_PublicOfferingMember
Public Offering [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 7,600,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_PublicOfferingMember |  | 3,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_PublicOfferingMember
Common Op Units Conversion To Common Shares [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) | 1,600,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_CommonOpUnitsConversionToCommonSharesMember | 1,200,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_CommonOpUnitsConversionToCommonSharesMember | 250,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = akr_CommonOpUnitsConversionToCommonSharesMember
Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation | 3,886 akr_RestrictedStockSharesCanceledForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
LTIP Units and Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Unit based compensation | 6.2 akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember | 0.5 akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember |

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