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NOTES RECEIVABLE, PREFERRED EQUITY, AND OTHER REAL ESTATE RELATED INVESTMENTS Schedule of Notes Receivable (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014 | Jul. 31, 2014 | Oct. 31, 2014 | Jan. 31, 2014 | Dec. 31, 2011 | May 31, 2014
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | $ 102,286,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |  | $ 126,656,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |  | $ 129,278,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |  |  |  |  | $ 59,989,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |
Proceeds from notes receivable | 1,900,000 us-gaap_ProceedsFromCollectionOfNotesReceivable | 18,095,000 us-gaap_ProceedsFromCollectionOfNotesReceivable |  | 29,583,000 us-gaap_ProceedsFromCollectionOfNotesReceivable |  | 25,388,000 us-gaap_ProceedsFromCollectionOfNotesReceivable |  |  |  |  |  |
Collections of principal | 1,200,000 us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal | 18,095,000 us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal |  | 29,583,000 us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal |  | 25,388,000 us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal |  |  |  |  |  |
New investments |  | 31,169,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans |  | 45,000,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans |  | 108,629,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans |  |  |  |  |  |
Collections of interest | 700,000 akr_MortgageLoansOnRealEstateCollectionsOfInterest |  |  |  |  |  |  |  |  |  |  |
152 - 154 Spring Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange of mortgage for investment |  |  |  |  |  |  | 38,000,000 akr_MortgageLoansonRealEstateExchangeofMortgageforInvestment / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |  |  |
First Mortgage, 7.7% Loan Due 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 7.70%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanSevenPointSevenPercentLoanDue2015Member | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanSevenPointSevenPercentLoanDue2015Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 12,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanSevenPointSevenPercentLoanDue2015Member |  | 12,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanSevenPointSevenPercentLoanDue2015Member |  |  |  |  |  |  |  |
Mezzanine Loan, 12.7% Loan, Due 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 12.70%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member | [1] |  |  |  | 12.70%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member |  |  |  |  |
First Priority Liens |  | 18,900,000 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 8,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member |  |  |  |  |  |  |  |
Proceeds from notes receivable |  |  |  |  |  |  | 13,000,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member | 5,000,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTwelvePointSevenPercentLoanDue2015Member |  |  |  |
First Mortgage Loan, 8.8% Loan, Due 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 8.80%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member | [1] |  |  |  |  |  | 8.80%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 7,500,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  |  |  |  |  |  |  |
Number of loan extensions |  | 1 akr_MortgageLoansonRealEstateNumberofLoanExtensions / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  |  |  |  |  |  |  |  |  |
Length of loan extension |  | 12 months |  |  |  |  |  |  |  |  |  |
New investments |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointEightPercentLoanDue2015Member |  |  |
Zero Coupon Loan, 24% Loan, Due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 24.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember | [1],[2] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 166,200,000 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember | [2] |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 4,986,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember | [2] | 4,431,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember | [2] |  |  |  |  |  |  |
Number of cross-collateralized loans |  | 3 akr_MortgageLoansonRealEstateNumberofCrossCollateralizedLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember |  |  |  |  |  |  |  |  |  |
Number of borrowers |  | 1 akr_MortgageLoansonRealEstateNumberofBorrowers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_ZeroCouponLoanMember |  |  |  |  |  |  |  |  |  |
First Mortgage Loan, 5.5% Loan Due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 5.50%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanFivePointFivePercentLoanDue2016Member | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanFivePointFivePercentLoanDue2016Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 4,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanFivePointFivePercentLoanDue2016Member |  | 42,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanFivePointFivePercentLoanDue2016Member |  |  |  |  |  |  |  |
Number of loan extensions |  | 1 akr_MortgageLoansonRealEstateNumberofLoanExtensions / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanFivePointFivePercentLoanDue2016Member |  |  |  |  |  |  |  |  |  |
Length of loan extension |  | 6 months |  |  |  |  |  |  |  |  |  |
Preferred Equity, 13.5% Loan, Due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 13.50%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member | [1] |  |  |  |  |  |  |  |  | 13.50%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 4,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member |  |  |  |  |  |  |  | 4,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityThirteenPointFivePercentLoanDue2016Member
Other Loan, 18% Loan, Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 18.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember | [1] |  |  |  |  | 18.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 3,307,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember |  |  |  | 4,800,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanEighteenPercentDue2017MemberMember |  |  |  |
Preferred Equity, 8.1% Loan, Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 8.10%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityEightPointOnePercentLoanDue2017Member | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 20,855,000 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityEightPointOnePercentLoanDue2017Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 13,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityEightPointOnePercentLoanDue2017Member |  | 13,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_PreferredEquityEightPointOnePercentLoanDue2017Member |  |  |  |  |  |  |  |
Mezzanine, 15% Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 15.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPercentDue2020Member | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPercentDue2020Member |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 30,879,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPercentDue2020Member |  | 30,879,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPercentDue2020Member |  |  |  |  |  |  |  |
First Mortgage Loan, 8.0% Loan, Due On Demand [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 6.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointZeroPercentLoanDueOnDemandMember | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointZeroPercentLoanDueOnDemandMember |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointZeroPercentLoanDueOnDemandMember |  | 6,400,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointZeroPercentLoanDueOnDemandMember |  |  |  |  |  |  |  |
Proceeds from notes receivable |  |  |  |  |  |  |  |  |  | 6,400,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_FirstMortgageLoanEightPointZeroPercentLoanDueOnDemandMember |  |
Other Loan, 2.5% LIBOR Loan, Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 4,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember |  | 3,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember |  |  |  | 4,000,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember |  |  |  |
New investments |  |  |  |  |  |  |  | 1,000,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_OtherLoanLIBORPlusTwoPointFivePercentVariableInterestRateDue2020MemberMember |  |  |  |
Mezzanine Loan, 10.0% Loan, Due On Demand [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 10.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTenPointZeroPercentLoanDueOnDemandMember | [1],[3] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 87,477,000 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTenPointZeroPercentLoanDueOnDemandMember | [3] |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 7,983,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTenPointZeroPercentLoanDueOnDemandMember | [3] | 9,089,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanTenPointZeroPercentLoanDueOnDemandMember | [3] |  |  |  |  |  |  |
Mezzanine Loan, 15.0% Loan, Due Upon Capital Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 15.00%akr_MortgageLoansOnRealEstateEffectiveInterestRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPointZeroPercentLoanDueUponCapitalEventMember | [1] |  |  |  |  |  |  |  |  |
First Priority Liens |  | 16,668,000 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPointZeroPercentLoanDueUponCapitalEventMember |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 0 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPointZeroPercentLoanDueUponCapitalEventMember |  | 3,834,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanFifteenPointZeroPercentLoanDueUponCapitalEventMember |  |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate Due 2014 to Capital Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
First Priority Liens |  | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember | [4] |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  | 2,631,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember | [4] | 2,023,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember | [4] |  |  |  |  |  |  |
Number of loans |  | 3 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember |  |  |  |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate Due 2014 to Capital Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.70%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [1],[4] |  |  |  |  |  |  |  |  |
Individually Less Than 3%, Variable Interest Rate Due 2014 to Capital Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 17.50%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_IndividuallyLessThanThreePercentVariableInterestRateDue2014toCapitalEventMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [1],[4] |  |  |  |  |  |  |  |  |
Mortgage Loan, LIBOR Plus 13.75% Loan, Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.75%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MortgageLoanLIBORPlusThreePointSevenFivePercentLoanDue2024Member |  |  |  |  |
Net carrying amount of notes receivable |  |  |  |  |  |  | 1,900,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MortgageLoanLIBORPlusThreePointSevenFivePercentLoanDue2024Member |  |  |  |  |
Mezzanine Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount of notes receivable |  |  |  |  |  |  | 8,300,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |  |  |  |
Proceeds from notes receivable |  |  |  |  |  |  | 10,300,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |  | 1,400,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |
Collections of principal |  |  |  |  |  |  |  |  |  | 700,000 us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |
Gain (loss) on sale of notes receivable |  |  |  |  |  |  |  |  |  | 700,000 us-gaap_GainLossOnSaleOfNotesReceivable / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |
Write-down or reserve, amount |  | $ 2,000,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = akr_MezzanineLoanMember |  |  |  |  |  |  |  |  |  |
[1] | Includes origination and exit fees
[2] | The principal balance for this accrual-only loan is increased by the interest accrued
[3] | Comprised of three cross-collateralized loans from one borrower, which are non-performing
[4] | Consists of three loans as of December 31, 2014

X
- Definition Mortgage Loans On Real Estate, Collections Of Interest + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Effective Interest Rate + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Exchange of Mortgage for Investment + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Length of Loan Extension + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Number of Borrowers + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Number of Cross Collateralized Loans + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Number of Loan Extensions + References No definition available. + Details
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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale the carrying amounts, net of allocated reserves, of notes receivable transferred to a third party in a transaction that qualifies for sales treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107425-111719 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The amount of principal collected on mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Total amount of new mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
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- Definition Amount of prior lien on the real estate that secures the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of reserve for write-down of a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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