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MORTGAGE AND OTHER NOTES PAYABLE (Details) (USD $)
 1 Months Ended 3 Months Ended
Mar. 31, 2015
extension_option
Mar. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]      
Mortgage and other notes payable $ 1,304,739,000us-gaap_LongTermDebt 1,304,739,000us-gaap_LongTermDebt $ 1,130,481,000us-gaap_LongTermDebt
Number of Loan Extensions 1akr_NumberOfLoanExtensions 1akr_NumberOfLoanExtensions  
Length of Loan Extension 6 years    
Unsecured credit facility | Line of Credit      
Mortgage Loans on Real Estate [Line Items]      
Mortgage and other notes payable 50,000,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember		 50,000,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember		  
New mortgage loans 50,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember		 50,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember		  
Unsecured credit facility | Line of Credit | Fund IV      
Mortgage Loans on Real Estate [Line Items]      
New mortgage loans 50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		 50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		  
Line of credit 31,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		 31,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		  
Unsecured credit facility | Line of Credit | Fund IV | LIBOR      
Mortgage Loans on Real Estate [Line Items]      
Basis spread on variable rate   2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_UnsecuredCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		  
Convertible Debt [Member]      
Mortgage Loans on Real Estate [Line Items]      
Redemption of debt   400,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		  
Line of Credit | Subscription Line | Line of Credit | Fund IV      
Mortgage Loans on Real Estate [Line Items]      
Mortgage and other notes payable 123,700,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_SubscriptionLineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		 123,700,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_SubscriptionLineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		  
New mortgage loans $ 46,600,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_SubscriptionLineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember		 46,600,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= akr_SubscriptionLineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= akr_FundIvMember