XML 92 R66.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Mortgage Loan and Other Indebtedness Balances (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Apr. 30, 2014 | Feb. 28, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 20, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 1,130,481 us-gaap_LongTermDebt |  |  |  | 1,130,481 us-gaap_LongTermDebt |  | $ 1,039,997 us-gaap_LongTermDebt |  |
Unamortized premium (discount) | 2,943 us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  |  |  | 2,943 us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  | 1,868 us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  |
LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description | LIBOR |  | LIBOR | LIBOR |  |  |  |  |
Variable Rate Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 326,221 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_VariableRateDebtMember |  |  |  | 326,221 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_VariableRateDebtMember |  | 224,041 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_VariableRateDebtMember |  |
Mortgage Notes Payable - Variable-Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 422,950 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 422,950 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 284,951 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Mortgage Notes Payable - Variable-Rate [Member] | Liberty Avenue [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 8,973 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 8,973 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 9,090 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Liberty Avenue [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_LibertyAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 210 Bowery LLC [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 4,600 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 4,600 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 4,600 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 210 Bowery LLC [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_TwoOneZeroBoweryLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 640 Broadway [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 22,564 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 22,564 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 22,750 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 3.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 3.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 640 Broadway [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_A640BroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Heritage Shops, LIBOR Plus 2.25% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 20,871 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Heritage Shops, LIBOR Plus 2.25% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusTwoPointTwoFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 4.00% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 20,650 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 20,650 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 20,650 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 4.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 4.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 4.00% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusFourPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 1.70% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 1.70% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointSevenZeroPercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Cortlandt Towne Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 83,936 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 83,936 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 84,745 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Cortlandt Towne Center [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_CortlandtTowneCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | New Hyde Park Shopping Center, LIBOR Plus 1.85% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 6,294 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | New Hyde Park Shopping Center, LIBOR Plus 1.85% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterLIBORPlusOnePointEightFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Norstrand Avenue [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 12,046 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 12,046 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 12,567 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Norstrand Avenue [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_NorstrandAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Heritage Shops, LIBOR Plus 1.55% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 24,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 24,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Heritage Shops, LIBOR Plus 1.55% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.55%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_HeritageShopsLIBORPlusOnePointFiveFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Lincoln Park Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 28,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 28,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 23,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Lincoln Park Center [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_LincolnParkCentreLlcMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 654 Broadway [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 9,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 9,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 654 Broadway [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.88%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_SixFiveFourBroadwayMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | New Hyde Park Shopping Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 11,720 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 11,720 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | New Hyde Park Shopping Center [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_NewHydeParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 938 West North Avenue [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 12,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 12,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.52%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.52%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 938 West North Avenue [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_NineThreeEightWestNorthAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 1151 Third Avenue [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 12,481 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 12,481 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 1151 Third Avenue [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_OneOneFiveOneThirdAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 161st Street [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 29,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 29,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 29,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 161st Street [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_OneHundredSixtyFirstStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 664 N. Michigan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 44,369 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 44,369 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 664 N. Michigan [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_SixSixFourNorthMichiganMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Paramus Plaza [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 12,600 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 12,600 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Paramus Plaza [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_ParamusPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Lake Montclair [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 15,284 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 15,284 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | Lake Montclair [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_LakeMontclairMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 1.39% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | City Point, LIBOR Plus 1.39% [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.39%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_CityPointLIBORPlusOnePointThreeNinePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 3104 M Street [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 103 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 103 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 3104 M Street [Member] | Prime [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | Prime |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 0.05%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_ThirtyOneZeroFourMStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 4401 White Plains [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 6,141 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 6,141 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 6,263 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.07%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.07%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 4401 White Plains [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_A4401WhitePlainsMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 28 Jericho Turnpike [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 15,747 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 15,747 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 16,164 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 2.07%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 2.07%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 28 Jericho Turnpike [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_TwentyEightJerichoTurnpikeMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 60 Orange Street [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 8,236 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 8,236 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  | 8,457 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |
Effective interest rate | 1.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  | 1.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember |  |  |  |
Mortgage Notes Payable - Variable-Rate [Member] | 60 Orange Street [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = akr_SixtyOrangeStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Unsecured Debt [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 77,100 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [1] |  |  | 77,100 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [1] | 68,750 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [1] |
Effective interest rate | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  | 1.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
Unsecured Debt [Member] | LIBOR [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 0 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Effective interest rate | 1.57%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 1.57%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |
Unsecured Debt [Member] | Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Unsecured Debt [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 50,000 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 50,000 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 50,000 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Effective interest rate | 1.47%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 1.47%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |
Unsecured Debt [Member] | Term Loan [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  |  |  |  | LIBOR |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = akr_TermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 223,829 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_InterestRateSwapMember | [2] |  |  | 223,829 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_InterestRateSwapMember | [2] | 179,660 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_InterestRateSwapMember | [2] |
Effective interest rate | 2.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_InterestRateSwapMember | [2] |  |  | 2.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_InterestRateSwapMember | [2] |  |  |
Mortgage Notes Payable - Fixed Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 801,317 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 801,317 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 814,088 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Mortgage Notes Payable - Fixed Rate [Member] | Clark Diversey [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ClarkDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ClarkDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 4,192 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ClarkDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 6.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ClarkDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 6.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ClarkDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | New Louden Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewLoudenCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewLoudenCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 13,369 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_NewLoudenCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewLoudenCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_NewLoudenCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | City Point [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 20,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 7.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 7.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Crescent Plaza [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 16,455 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CrescentPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 16,455 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CrescentPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 16,747 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CrescentPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 4.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CrescentPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 4.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CrescentPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Pacesetter Park Shopping Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 11,307 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_PacesetterParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 11,307 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_PacesetterParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 11,530 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_PacesetterParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_PacesetterParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_PacesetterParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Elmwood Park Shopping Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 32,201 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ElmwoodParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 32,201 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ElmwoodParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 32,744 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ElmwoodParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.53%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ElmwoodParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.53%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ElmwoodParkShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Chicago Street Retail Portfolio [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 15,265 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 15,265 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 15,558 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.61%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.61%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_ChicagoStreetRetailPortfolioMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | The Gateway Shopping Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 19,440 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_GatewayShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 19,440 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_GatewayShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 19,746 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_GatewayShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_GatewayShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_GatewayShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | 330 - 340 River Street [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 10,668 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RiverStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 10,668 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RiverStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 10,904 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RiverStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_RiverStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_RiverStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Brandywine Town Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 166,200 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BrandywineTownCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 166,200 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BrandywineTownCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 166,200 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BrandywineTownCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_BrandywineTownCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_BrandywineTownCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Walnut Hill Plaza [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_WalnutHillPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_WalnutHillPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 22,910 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_WalnutHillPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 6.06%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_WalnutHillPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 6.06%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_WalnutHillPlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Rhode Island Place Shopping Center [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 15,975 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RhodeIslandPlaceShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 15,975 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RhodeIslandPlaceShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 16,208 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_RhodeIslandPlaceShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 6.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_RhodeIslandPlaceShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 6.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_RhodeIslandPlaceShoppingCenterMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | 239 Greenwich Avenue [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 26,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A239GreenwichAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 26,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A239GreenwichAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 26,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A239GreenwichAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A239GreenwichAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A239GreenwichAvenueMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | 639 West Diversey [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 4,245 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixThreeNineWestDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 4,245 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixThreeNineWestDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 4,341 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_SixThreeNineWestDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 6.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixThreeNineWestDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 6.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_SixThreeNineWestDiverseyMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Merrillville Plaza [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 25,504 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_MerrillvillePlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 25,504 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_MerrillvillePlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 25,837 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_MerrillvillePlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_MerrillvillePlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_MerrillvillePlazaMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | Bedford Green [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 29,586 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BedfordGreenMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 29,586 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BedfordGreenMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_BedfordGreenMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_BedfordGreenMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_BedfordGreenMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | 216th Street [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A216ThStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A216ThStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 25,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_A216ThStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 5.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A216ThStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_A216ThStreetMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | City Point, 1% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 5,262 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CitypointOnePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 5,262 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CitypointOnePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  | 5,262 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CitypointOnePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |
Effective interest rate | 1.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CitypointOnePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  | 1.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CitypointOnePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember |  |  |  |
Mortgage Notes Payable - Fixed Rate [Member] | City Point, 4.75% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 199,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointFourPointSevenFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember | [3] |  |  | 199,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointFourPointSevenFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember | [3] | 197,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = akr_CityPointFourPointSevenFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember | [3] |
Effective interest rate | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointFourPointSevenFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember | [3] |  |  | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = akr_CityPointFourPointSevenFivePercentMember / us-gaap_LongtermDebtTypeAxis = akr_MortgageNotesPayableFixedRateMember | [3] |  |  |
Mortgage loan maturity |  |  |  |  | 5 years |  |  |  |
Convertible Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage and other notes payable | 380 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | [4] |  |  | 380 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | [4] | $ 380 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | [4] |
Effective interest rate | 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | [4] |  |  | 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | [4] |  |  | 6.03%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
[1] | The Fund IV revolving subscription line of credit is secured by unfunded investor capital commitments.
[2] | Represents the amount of the Company’s variable-rate debt that has been fixed through certain cash flow hedge transactions (Note 10).
[3] | The maturity date of this loan is five years after the final advancing of funds which is currently anticipated to occur by the end of 2015.
[4] | Holders of the Convertible Notes may require the Company to repurchase them at par on December 15, 2016 and December 15, 2021. The Company may redeem the Convertible Notes, in whole, or in part, at any time

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