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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Noncontrolling Interest (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 417,352,000 us-gaap_MinorityInterest |  |  |  |  | $ 417,352,000 us-gaap_MinorityInterest |  |
Net income for the period January 1 through December 31, 2014 |  |  |  |  |  |  |  |  | 81,082,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 4,525,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 50,230,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Conversion of 136,128 OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 44,051,000 akr_IssuanceOfOpUnitsToAcquireRealEstate | 33,300,000 akr_IssuanceOfOpUnitsToAcquireRealEstate | 2,279,000 akr_IssuanceOfOpUnitsToAcquireRealEstate
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (9,061,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 3,610,000 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (3,519,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 3,776,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | 2,892,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | 2,268,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 57,969,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest | 49,324,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest | 172,228,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (218,152,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | (87,688,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | (160,663,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 8,460,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures | 7,672,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures | 6,691,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Balance | 380,416,000 us-gaap_MinorityInterest |  |  |  | 417,352,000 us-gaap_MinorityInterest |  |  |  | 380,416,000 us-gaap_MinorityInterest | 417,352,000 us-gaap_MinorityInterest |
Distributions declared (in dollars per share) | $ 0.54 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.23 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.23 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.23 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.23 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.21 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.21 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.21 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.23 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.86 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.72 us-gaap_CommonStockDividendsPerShareDeclared
Limited partners' capital account, units issued and converted (in shares) | 136,128 akr_ShareBasedCompensationConvertibleFeatureOperatingPartnershipUnitsSharesConvertedToCommonStock |  |  |  |  |  |  |  | 136,128 akr_ShareBasedCompensationConvertibleFeatureOperatingPartnershipUnitsSharesConvertedToCommonStock |  |
Units converted from Series A Preferred OP Units (in shares) | 185,600 akr_ShareBasedCompensationUnitsConvertedFromSeriesPreferredOpUnits |  |  |  |  |  |  |  | 185,600 akr_ShareBasedCompensationUnitsConvertedFromSeriesPreferredOpUnits |  |
Denominator for Series A Preferred OP Unit conversion | 7.50 akr_DenominatorForSeriesPreferredOpUnitConversion |  |  |  |  |  |  |  | 7.50 akr_DenominatorForSeriesPreferredOpUnitConversion |  |
LTIP Units [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
LTIP units outstanding (in shares) | 1,719,206 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember |  |  |  | 1,368,086 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember |  |  |  | 1,719,206 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember | 1,368,086 akr_ShareBasedCompensationUnitsOutstanding / us-gaap_AwardTypeAxis = akr_LtipUnitsMember |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Per unit conversion amount, Series A Preferred OP Units (in dollars per unit) | 22.50 akr_PerUnitConversionAmountPreferredOpUnits / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  | 22.50 akr_PerUnitConversionAmountPreferredOpUnits / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Per unit conversion annual rate, Series A Preferred OP Units | 9.00%akr_PerUnitConversionAnnualRatePreferredOpUnits / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  | 9.00%akr_PerUnitConversionAnnualRatePreferredOpUnits / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Limited partners' capital account, units issued and converted (in shares) | 1,392 akr_ShareBasedCompensationConvertibleFeatureOperatingPartnershipUnitsSharesConvertedToCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  | 1,392 akr_ShareBasedCompensationConvertibleFeatureOperatingPartnershipUnitsSharesConvertedToCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Conversion of 136,128 OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (3,181,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,548,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (5,880,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 44,051,000 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 33,300,000 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2,279,000 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (1,247,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 69,000 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,704,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 1,099,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 994,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 847,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 57,969,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 49,324,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 172,228,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (218,152,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (87,688,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (160,663,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 6,528,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 6,530,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 6,025,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling Interests | Partially-Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 368,404,000 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 368,404,000 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Distributions declared of $1.23 per Common OP Unit |  |  |  |  |  |  |  |  | 0 us-gaap_DividendsCommonStockCash / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Net income for the period January 1 through December 31, 2014 |  |  |  |  |  |  |  |  | 77,878,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Conversion of 136,128 OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 0 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (902,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 984,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 57,969,000 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (218,152,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Balance | 286,181,000 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  | 286,181,000 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 2,988,277 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |  |  |  | 1,457,467 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |  |  |  | 2,988,277 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember | 1,457,467 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |
Operating Partnership, as General Partner or Managing Member [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred 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 |  |  |  | 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 | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Limited partners' capital account, value per unit (in dollars per unit) | 1,000 akr_LimitedPartnersCapitalAccountValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 1,000 akr_LimitedPartnersCapitalAccountValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 1,000 akr_LimitedPartnersCapitalAccountValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 1,000 akr_LimitedPartnersCapitalAccountValuePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Operating Partnership, as General Partner or Managing Member [Member] | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 48,948,000 us-gaap_MinorityInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 48,948,000 us-gaap_MinorityInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Distributions declared of $1.23 per Common OP Unit |  |  |  |  |  |  |  |  | (5,085,000)us-gaap_DividendsCommonStockCash / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Net income for the period January 1 through December 31, 2014 |  |  |  |  |  |  |  |  | 3,204,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Conversion of 136,128 OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (3,181,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 44,051,000 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (345,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 115,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 0 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 6,528,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Balance | $ 94,235,000 us-gaap_MinorityInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  | $ 94,235,000 us-gaap_MinorityInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |

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- Definition Denominator for Series A Preferred OP Unit Conversion + References No definition available. + Details
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- Definition Issuance of OP Units to Acquire Real Estate + References No definition available. + Details
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Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Per Unit Conversion Amount, Preferred OP Units + References No definition available. + Details
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- Definition Per Unit Conversion Annual Rate, Preferred OP Units + References No definition available. + Details
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- Definition Share-based Compensation, Units converted from Series A Preferred OP Units + References No definition available. + Details
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Namespace Prefix: | akr_
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