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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges $ 0us-gaap_ImpairmentOfRealEstate $ 8,183,000us-gaap_ImpairmentOfRealEstate $ 0us-gaap_ImpairmentOfRealEstate  
Sales Price 388,840,000akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross      
Variable rate debt 1,130,481,000us-gaap_LongTermDebt 1,039,997,000us-gaap_LongTermDebt   1,039,997,000us-gaap_LongTermDebt
Accumulated other comprehensive income - unrealized income (loss) on valuation of swap agreements (4,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 1,100,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax   1,100,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Cash flow hedge gain (loss) to be reclassified within 12 months 4,300,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths      
Cash Flow Hedging [Member] | Variable-Rate Derivatives [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, cap interest rate 3.00%us-gaap_DerivativeCapInterestRate
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_VariableRateDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Cash Flow Hedging [Member] | Variable-Rate Derivatives [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, cap interest rate 4.30%us-gaap_DerivativeCapInterestRate
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_VariableRateDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, number of instruments held 14us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, notional amount 223,800,000invest_DerivativeNotionalAmount
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_FixedRateDerivativesMaturingBetweenMay2015AndDecember2022Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, fixed interest rate 0.70%us-gaap_DerivativeFixedInterestRate
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_FixedRateDerivativesMaturingBetweenMay2015AndDecember2022Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, fixed interest rate 3.77%us-gaap_DerivativeFixedInterestRate
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_FixedRateDerivativesMaturingBetweenMay2015AndDecember2022Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Variable-Rate Derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, number of instruments held 4us-gaap_DerivativeNumberOfInstrumentsHeld
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_VariableRateDerivativesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Derivative, notional amount 139,600,000invest_DerivativeNotionalAmount
/ akr_DerivativeFinancialInstrumentsInformationAxis
= akr_VariableRateDerivativesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Cash Flow Hedging [Member] | Forward Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, number of instruments held 2us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Variable rate debt 50,000,000us-gaap_LongTermDebt
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Derivative financial instruments, liabilities 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 226,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Derivative financial instruments, liabilities 4,567,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities 4,600,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
2,000,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  2,000,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] | Prepaid Expenses and Other Assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 200,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
3,100,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  3,100,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Derivative financial instruments, liabilities 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
     
Mervyns I and Mervyns II [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges     2,000,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= akr_MervynsIAndMervynsIiMember
 
Fund III [Member] | Walnut Hill Plaza [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges   1,500,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_WalnutHillPlazaMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIiiMember
   
Fund III [Member] | Sheepshead Bay [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges   6,700,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_SheepsheadBayMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIiiMember
   
Sales Price       $ 20,200,000akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_SheepsheadBayMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIiiMember