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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION Schedule of Real Estate and Accumulated Depreciation (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 1,130,101,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances |  |  |
Initial Cost to Company of Land | 451,700,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand |  |  |
Initial Cost to Company of Buildings and Improvements | 1,152,388,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements |  |  |
Costs Capitalized Subsequent to Acquisition | 604,507,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts |  |  |
Carrying Amount of Land | 478,876,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand |  |  |
Carrying Amount of Buildings and Improvements | 1,729,719,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements |  |  |
Total Carrying Amount | 2,208,595,000 us-gaap_RealEstateGrossAtCarryingValue | 1,819,053,000 us-gaap_RealEstateGrossAtCarryingValue | 1,287,198,000 us-gaap_RealEstateGrossAtCarryingValue | 897,370,000 us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation | 256,015,000 us-gaap_RealEstateAccumulatedDepreciation | 229,538,000 us-gaap_RealEstateAccumulatedDepreciation | 169,718,000 us-gaap_RealEstateAccumulatedDepreciation | 147,626,000 us-gaap_RealEstateAccumulatedDepreciation
Real Estate, Federal Income Tax Basis | 1,811,200,000 us-gaap_RealEstateFederalIncomeTaxBasis |  |  |
Minimum [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Real Estate and Accumulated Depreciation, Life Used for Depreciation | 30 years |  |  |
Maximum [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Real Estate and Accumulated Depreciation, Life Used for Depreciation | 40 years |  |  |
Core Portfolio [Member] | Crescent Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 16,455,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Initial Cost to Company of Land | 1,147,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,425,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,376,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Carrying Amount of Land | 1,147,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 8,801,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Total Carrying Amount | 9,948,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Accumulated Depreciation | 6,913,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CrescentPlazaMember |  |  |
Core Portfolio [Member] | New Louden Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Initial Cost to Company of Land | 505,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 4,161,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 13,052,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Carrying Amount of Land | 505,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 17,213,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Total Carrying Amount | 17,718,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Accumulated Depreciation | 13,112,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewLoudenCenterMember |  |  |
Core Portfolio [Member] | Mark Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 4,268,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | (872,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 3,396,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Total Carrying Amount | 3,396,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Accumulated Depreciation | 2,783,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarkPlazaMember |  |  |
Core Portfolio [Member] | Plaza 422 [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Initial Cost to Company of Land | 190,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Initial Cost to Company of Buildings and Improvements | 3,004,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Costs Capitalized Subsequent to Acquisition | 2,309,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Carrying Amount of Land | 190,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Carrying Amount of Buildings and Improvements | 5,313,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Total Carrying Amount | 5,503,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Accumulated Depreciation | 4,963,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Plaza422Member |  |  |
Core Portfolio [Member] | Route 6 Mall [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Initial Cost to Company of Land | 1,664,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Initial Cost to Company of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Costs Capitalized Subsequent to Acquisition | 12,276,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Carrying Amount of Land | 1,664,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Carrying Amount of Buildings and Improvements | 12,276,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Total Carrying Amount | 13,940,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Accumulated Depreciation | 7,624,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Route6MallMember |  |  |
Core Portfolio [Member] | Abington Towne Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Initial Cost to Company of Land | 799,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 3,197,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 2,357,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Carrying Amount of Land | 799,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 5,554,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Total Carrying Amount | 6,353,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Accumulated Depreciation | 3,307,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AbingtonTowneCenterMember |  |  |
Core Portfolio [Member] | Bloomfield Town Square [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Initial Cost to Company of Land | 3,207,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Initial Cost to Company of Buildings and Improvements | 13,774,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Costs Capitalized Subsequent to Acquisition | 21,579,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Carrying Amount of Land | 3,207,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Carrying Amount of Buildings and Improvements | 35,353,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Total Carrying Amount | 38,560,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Accumulated Depreciation | 15,511,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BloomfieldTownSquareMember |  |  |
Core Portfolio [Member] | Elmwood Park Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 32,201,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Initial Cost to Company of Land | 3,248,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,992,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 15,855,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Carrying Amount of Land | 3,798,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 28,297,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Total Carrying Amount | 32,095,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Accumulated Depreciation | 15,647,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElmwoodParkPlazaMember |  |  |
Core Portfolio [Member] | Merrillville Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 25,503,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Initial Cost to Company of Land | 4,288,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 17,152,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 5,553,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Carrying Amount of Land | 4,288,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 22,705,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Total Carrying Amount | 26,993,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Accumulated Depreciation | 9,400,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MerrillvillePlazaMember |  |  |
Core Portfolio [Member] | Marketplace of Absecon [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Initial Cost to Company of Land | 2,573,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Initial Cost to Company of Buildings and Improvements | 10,294,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Costs Capitalized Subsequent to Acquisition | 4,900,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Carrying Amount of Land | 2,577,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Carrying Amount of Buildings and Improvements | 15,190,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Total Carrying Amount | 17,767,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Accumulated Depreciation | 6,616,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MarketplaceOfAbseconMember |  |  |
Core Portfolio [Member] | 239 Greenwich Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 26,000,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Initial Cost to Company of Land | 1,817,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 15,846,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 597,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Carrying Amount of Land | 1,817,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 16,443,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Total Carrying Amount | 18,260,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Accumulated Depreciation | 6,545,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A239GreenwichAvenueMember |  |  |
Core Portfolio [Member] | Hobson West Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Initial Cost to Company of Land | 1,793,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,172,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,842,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Carrying Amount of Land | 1,793,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 9,014,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Total Carrying Amount | 10,807,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Accumulated Depreciation | 4,308,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HobsonWestPlazaMember |  |  |
Core Portfolio [Member] | Village Commons Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Initial Cost to Company of Land | 3,229,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,917,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 4,048,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Carrying Amount of Land | 3,229,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 16,965,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Total Carrying Amount | 20,194,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Accumulated Depreciation | 7,799,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_VillageCommonsShoppingCenterMember |  |  |
Core Portfolio [Member] | Town Line Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Initial Cost to Company of Land | 878,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 3,510,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 7,609,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Carrying Amount of Land | 907,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 11,090,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Total Carrying Amount | 11,997,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Accumulated Depreciation | 8,615,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TownLinePlazaMember |  |  |
Core Portfolio [Member] | Branch Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Initial Cost to Company of Land | 3,156,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,545,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 11,457,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Carrying Amount of Land | 3,401,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 23,757,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Total Carrying Amount | 27,158,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Accumulated Depreciation | 7,045,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BranchShoppingCenterMember |  |  |
Core Portfolio [Member] | The Methuen Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Initial Cost to Company of Land | 956,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 3,826,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 594,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Carrying Amount of Land | 961,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 4,415,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Total Carrying Amount | 5,376,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Accumulated Depreciation | 2,070,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MethuenShoppingCenterMember |  |  |
Core Portfolio [Member] | The Gateway Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 19,440,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Initial Cost to Company of Land | 1,273,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,091,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 12,258,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Carrying Amount of Land | 1,273,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 17,349,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Total Carrying Amount | 18,622,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Accumulated Depreciation | 7,608,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_GatewayShoppingCenterMember |  |  |
Core Portfolio [Member] | Mad River Station [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Initial Cost to Company of Land | 2,350,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Initial Cost to Company of Buildings and Improvements | 9,404,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,149,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Carrying Amount of Land | 2,350,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Carrying Amount of Buildings and Improvements | 10,553,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Total Carrying Amount | 12,903,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Accumulated Depreciation | 4,590,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MadRiverStationMember |  |  |
Core Portfolio [Member] | Pacesetter Park Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 11,307,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Initial Cost to Company of Land | 1,475,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,899,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 2,235,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Carrying Amount of Land | 1,475,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 8,134,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Total Carrying Amount | 9,609,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Accumulated Depreciation | 3,757,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_PacesetterParkShoppingCenterMember |  |  |
Core Portfolio [Member] | Brandywine Town Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 141,825,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Initial Cost to Company of Land | 21,993,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 87,988,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 16,329,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Carrying Amount of Land | 24,213,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 102,097,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Total Carrying Amount | 126,310,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Accumulated Depreciation | 28,808,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineTownCenterMember |  |  |
Core Portfolio [Member] | Brandywine Market Square [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 24,375,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Initial Cost to Company of Land | 4,308,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Initial Cost to Company of Buildings and Improvements | 17,239,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Costs Capitalized Subsequent to Acquisition | 970,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Carrying Amount of Land | 4,262,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Carrying Amount of Buildings and Improvements | 18,255,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Total Carrying Amount | 22,517,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Accumulated Depreciation | 5,916,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BrandywineMarketSquareMember |  |  |
Core Portfolio [Member] | Bartow Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Initial Cost to Company of Land | 1,691,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,803,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 638,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Carrying Amount of Land | 1,691,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 6,441,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Total Carrying Amount | 8,132,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Accumulated Depreciation | 2,310,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BartowAvenueMember |  |  |
Core Portfolio [Member] | Amboy Rd. Shopping Ctr. [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Initial Cost to Company of Buildings and Improvements | 11,909,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Costs Capitalized Subsequent to Acquisition | 2,514,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Carrying Amount of Buildings and Improvements | 14,423,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Total Carrying Amount | 14,423,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Accumulated Depreciation | 4,306,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_AmboyRdShoppingCtrMember |  |  |
Core Portfolio [Member] | 613-623 West Diversey [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Initial Cost to Company of Land | 10,061,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Initial Cost to Company of Buildings and Improvements | 2,773,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Costs Capitalized Subsequent to Acquisition | 355,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Carrying Amount of Land | 10,061,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Carrying Amount of Buildings and Improvements | 3,128,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Total Carrying Amount | 13,189,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Accumulated Depreciation | 793,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A613623WestDiverseyMember |  |  |
Core Portfolio [Member] | Chestnut Hill [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Initial Cost to Company of Land | 8,289,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,691,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Costs Capitalized Subsequent to Acquisition | 4,242,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Carrying Amount of Land | 8,289,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Carrying Amount of Buildings and Improvements | 9,933,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Total Carrying Amount | 18,222,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Accumulated Depreciation | 2,143,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChestnutHillMember |  |  |
Core Portfolio [Member] | Third Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Initial Cost to Company of Land | 11,108,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 8,038,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 4,397,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Carrying Amount of Land | 11,855,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 11,688,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Total Carrying Amount | 23,543,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Accumulated Depreciation | 1,851,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirdAvenueMember |  |  |
Core Portfolio [Member] | West Shore Expressway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Initial Cost to Company of Land | 3,380,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Initial Cost to Company of Buildings and Improvements | 13,554,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Costs Capitalized Subsequent to Acquisition | (55,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Carrying Amount of Land | 3,380,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Carrying Amount of Buildings and Improvements | 13,499,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Total Carrying Amount | 16,879,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Accumulated Depreciation | 2,969,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestShoreExpresswayMember |  |  |
Core Portfolio [Member] | West 54th Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Initial Cost to Company of Land | 16,699,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 18,704,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 949,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Carrying Amount of Land | 16,699,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 19,653,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Total Carrying Amount | 36,352,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Accumulated Depreciation | 3,692,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_West54ThStreetMember |  |  |
Core Portfolio [Member] | Acadia 5-7 East 17th Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Initial Cost to Company of Land | 3,048,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,281,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 376,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Carrying Amount of Land | 3,048,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 7,657,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Total Carrying Amount | 10,705,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Accumulated Depreciation | 1,321,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_Acadia57East17ThStreetMember |  |  |
Core Portfolio [Member] | West Diversey 651-671 W Diversey [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Initial Cost to Company of Land | 8,576,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Initial Cost to Company of Buildings and Improvements | 17,256,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Costs Capitalized Subsequent to Acquisition | 8,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Carrying Amount of Land | 8,576,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Carrying Amount of Buildings and Improvements | 17,264,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Total Carrying Amount | 25,840,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Accumulated Depreciation | 1,546,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_WestDiversey651671WDiverseyMember |  |  |
Core Portfolio [Member] | Mercer Street 15 Mercer Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Initial Cost to Company of Land | 1,887,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 2,483,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 7,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Carrying Amount of Land | 1,887,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 2,490,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Total Carrying Amount | 4,377,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Accumulated Depreciation | 217,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_MercerStreet15MercerStreetMember |  |  |
Core Portfolio [Member] | 4401 White Plains [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 6,141,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Initial Cost to Company of Land | 1,581,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,054,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Carrying Amount of Land | 1,581,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Carrying Amount of Buildings and Improvements | 5,054,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Total Carrying Amount | 6,635,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Accumulated Depreciation | 421,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A4401WhitePlainsMember |  |  |
Core Portfolio [Member] | Chicago Street Retail Portfolio [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 15,485,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Initial Cost to Company of Land | 18,521,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Initial Cost to Company of Buildings and Improvements | 55,627,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,576,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Carrying Amount of Land | 18,559,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Carrying Amount of Buildings and Improvements | 57,165,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Total Carrying Amount | 75,724,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Accumulated Depreciation | 3,692,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ChicagoStreetRetailPortfolioMember |  |  |
Core Portfolio [Member] | 330 River Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 3,974,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Initial Cost to Company of Land | 3,510,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 2,886,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Carrying Amount of Land | 3,510,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 2,886,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Total Carrying Amount | 6,396,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Accumulated Depreciation | 237,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeThreeZeroRiverStreetMember |  |  |
Core Portfolio [Member] | Rhode Island Place Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 16,560,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Initial Cost to Company of Land | 7,458,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 15,968,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 158,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Carrying Amount of Land | 7,458,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 16,126,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Total Carrying Amount | 23,584,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Accumulated Depreciation | 1,141,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RhodeIslandPlaceShoppingCenterMember |  |  |
Core Portfolio [Member] | 1520 North Milwaukee Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Initial Cost to Company of Land | 2,110,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 1,306,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Carrying Amount of Land | 2,110,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 1,306,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Total Carrying Amount | 3,416,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Accumulated Depreciation | 155,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A1520NorthMilwaukeeAvenueMember |  |  |
Core Portfolio [Member] | 340 River Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 6,820,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Initial Cost to Company of Land | 4,894,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 11,349,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Carrying Amount of Land | 4,894,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 11,349,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Total Carrying Amount | 16,243,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Accumulated Depreciation | 840,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeFourZeroRiverStreetMember |  |  |
Core Portfolio [Member] | 930 Rush Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Initial Cost to Company of Land | 4,933,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 14,587,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 11,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Carrying Amount of Land | 4,933,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 14,598,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Total Carrying Amount | 19,531,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Accumulated Depreciation | 1,003,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThirtyRushStreetMember |  |  |
Core Portfolio [Member] | 28 Jericho Turnpike [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 15,747,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Initial Cost to Company of Land | 6,220,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Initial Cost to Company of Buildings and Improvements | 24,416,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Carrying Amount of Land | 6,220,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Carrying Amount of Buildings and Improvements | 24,416,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Total Carrying Amount | 30,636,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Accumulated Depreciation | 1,654,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwentyEightJerichoTurnpikeMember |  |  |
Core Portfolio [Member] | 181 Main Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Initial Cost to Company of Land | 1,908,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,158,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Carrying Amount of Land | 1,908,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 12,158,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Total Carrying Amount | 14,066,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Accumulated Depreciation | 644,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneEightyOneMainStreetMember |  |  |
Core Portfolio [Member] | 83 Spring Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Initial Cost to Company of Land | 1,754,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 9,200,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Carrying Amount of Land | 1,754,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 9,200,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Total Carrying Amount | 10,954,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Accumulated Depreciation | 575,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightyThreeSpringStreetMember |  |  |
Core Portfolio [Member] | 60 Orange Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 8,236,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Initial Cost to Company of Land | 3,609,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 10,790,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Carrying Amount of Land | 3,609,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 10,790,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Total Carrying Amount | 14,399,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Accumulated Depreciation | 669,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOrangeStreetMember |  |  |
Core Portfolio [Member] | 171-53 and 181-03 Connecticut Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Initial Cost to Company of Land | 11,690,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 10,135,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 318,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Carrying Amount of Land | 11,689,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 10,454,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Total Carrying Amount | 22,143,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Accumulated Depreciation | 579,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneSeventyNineDashFiftyThreeAndOneEightZeroOneDashZeroThreeConnecticutAvenueMember |  |  |
Core Portfolio [Member] | 639 West Diversey [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 4,480,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Initial Cost to Company of Land | 4,429,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Initial Cost to Company of Buildings and Improvements | 6,102,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Costs Capitalized Subsequent to Acquisition | 313,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Carrying Amount of Land | 4,429,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Carrying Amount of Buildings and Improvements | 6,415,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Total Carrying Amount | 10,844,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Accumulated Depreciation | 332,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixThreeNineWestDiverseyMember |  |  |
Core Portfolio [Member] | 664 North Michigan Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 44,369,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Initial Cost to Company of Land | 15,240,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 65,331,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Carrying Amount of Land | 15,240,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 65,331,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Total Carrying Amount | 80,571,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Accumulated Depreciation | 3,089,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A664NorthMichiganAvenueMember |  |  |
Core Portfolio [Member] | 8-12 East Walton [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Initial Cost to Company of Land | 5,398,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Initial Cost to Company of Buildings and Improvements | 15,601,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Costs Capitalized Subsequent to Acquisition | 22,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Carrying Amount of Land | 5,398,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Carrying Amount of Buildings and Improvements | 15,623,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Total Carrying Amount | 21,021,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Accumulated Depreciation | 626,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightTwelveEastWaltonMember |  |  |
Core Portfolio [Member] | 3200 - 3204 M Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Initial Cost to Company of Land | 6,899,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 4,249,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Carrying Amount of Land | 6,899,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 4,249,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Total Carrying Amount | 11,148,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Accumulated Depreciation | 133,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThirtyTwoHundredToThirtyTwoZeroFourMStreetMember |  |  |
Core Portfolio [Member] | 868 Broadway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Initial Cost to Company of Land | 3,519,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Initial Cost to Company of Buildings and Improvements | 9,247,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Costs Capitalized Subsequent to Acquisition | 5,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Carrying Amount of Land | 3,519,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Carrying Amount of Buildings and Improvements | 9,252,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Total Carrying Amount | 12,771,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Accumulated Depreciation | 248,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixEightBroadwayMember |  |  |
Core Portfolio [Member] | 313 - 315 Bowery [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,516,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Carrying Amount of Buildings and Improvements | 5,516,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Total Carrying Amount | 5,516,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Accumulated Depreciation | 223,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeOneThreetoThreeOneFiveBoweryMember |  |  |
Core Portfolio [Member] | 120 West Broadway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Initial Cost to Company of Buildings and Improvements | 32,819,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Costs Capitalized Subsequent to Acquisition | 20,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Carrying Amount of Buildings and Improvements | 32,839,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Total Carrying Amount | 32,839,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Accumulated Depreciation | 497,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneTwentyWestBroadwayMember |  |  |
Core Portfolio [Member] | 11 East Walton [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Initial Cost to Company of Land | 11,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Initial Cost to Company of Buildings and Improvements | 33,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Carrying Amount of Land | 11,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Carrying Amount of Buildings and Improvements | 33,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Total Carrying Amount | 44,000,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Accumulated Depreciation | 756,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ElevenEastWaltonMember |  |  |
Core Portfolio [Member] | 61 Main Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Initial Cost to Company of Land | 1,825,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,505,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Carrying Amount of Land | 1,825,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 5,505,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Total Carrying Amount | 7,330,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Accumulated Depreciation | 114,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SixtyOneMainStreetMember |  |  |
Core Portfolio [Member] | 865 W. North Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Initial Cost to Company of Land | 3,688,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 11,063,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Carrying Amount of Land | 3,688,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 11,063,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Total Carrying Amount | 14,751,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Accumulated Depreciation | 230,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_EightSixFiveWestNorthAvenueMember |  |  |
Core Portfolio [Member] | 152 - 154 Spring Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Initial Cost to Company of Land | 9,500,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 28,500,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Carrying Amount of Land | 9,500,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 28,500,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Total Carrying Amount | 38,000,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Accumulated Depreciation | 475,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember |  |  |
Core Portfolio [Member] | 2520 Flatbush Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Initial Cost to Company of Land | 4,275,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,825,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Carrying Amount of Land | 4,275,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 12,825,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Total Carrying Amount | 17,100,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Accumulated Depreciation | 187,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember |  |  |
Core Portfolio [Member] | 252 - 254 Greenwich Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Initial Cost to Company of Land | 6,113,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 18,378,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Carrying Amount of Land | 6,113,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 18,378,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Total Carrying Amount | 24,491,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Accumulated Depreciation | 344,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember |  |  |
Core Portfolio [Member] | Bedford Green [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 31,363,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Initial Cost to Company of Land | 13,788,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Initial Cost to Company of Buildings and Improvements | 35,153,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Carrying Amount of Land | 13,788,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Carrying Amount of Buildings and Improvements | 35,153,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Total Carrying Amount | 48,941,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Accumulated Depreciation | 450,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_BedfordGreenMember |  |  |
Core Portfolio [Member] | 131 - 135 Prince Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Initial Cost to Company of Land | 19,274,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 38,519,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Carrying Amount of Land | 19,274,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 38,519,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Total Carrying Amount | 57,793,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Accumulated Depreciation | 321,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember |  |  |
Core Portfolio [Member] | Shops At Grand Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Initial Cost to Company of Land | 14,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 42,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Carrying Amount of Land | 14,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 42,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Total Carrying Amount | 56,000,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Accumulated Depreciation | 263,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ShopsAtGrandAvenueMember |  |  |
Core Portfolio [Member] | 201 Needham Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Initial Cost to Company of Land | 2,531,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,594,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Carrying Amount of Land | 2,531,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 7,594,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Total Carrying Amount | 10,125,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Accumulated Depreciation | 16,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoZeroOneNeedhamStreetMember |  |  |
Core Portfolio [Member] | Undeveloped Land [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Initial Cost to Company of Land | 100,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Initial Cost to Company of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Carrying Amount of Land | 100,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Carrying Amount of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Total Carrying Amount | 100,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Accumulated Depreciation | 0 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_UndevelopedLandMember |  |  |
Core Portfolio [Member] | ARLP [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 50,000,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Initial Cost to Company of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Carrying Amount of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Total Carrying Amount | 0 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Accumulated Depreciation | 0 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_CorePortfolioMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ARLPMember |  |  |
Fund I [Member] | Kroger/Safeway Various [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Initial Cost to Company of Buildings and Improvements | 4,215,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Carrying Amount of Buildings and Improvements | 4,215,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Total Carrying Amount | 4,215,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Accumulated Depreciation | 4,027,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_KrogerSafewayVariousMember |  |  |
Fund II [Member] | Liberty Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 8,973,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,627,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 647,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 13,274,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Total Carrying Amount | 13,274,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Accumulated Depreciation | 3,060,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LibertyAvenueMember |  |  |
Fund II [Member] | City Point [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Initial Cost to Company of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Costs Capitalized Subsequent to Acquisition | 7,473,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Carrying Amount of Buildings and Improvements | 7,473,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Total Carrying Amount | 7,473,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Accumulated Depreciation | 186,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CityPointMember |  |  |
Fund II [Member] | 161st Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,500,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Initial Cost to Company of Land | 16,679,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 28,410,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 18,231,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Carrying Amount of Land | 16,679,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 46,641,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Total Carrying Amount | 63,320,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Accumulated Depreciation | 9,494,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A161StStreetMember |  |  |
Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 83,936,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Initial Cost to Company of Land | 7,293,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 61,395,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 9,213,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Carrying Amount of Land | 7,293,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 70,608,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Total Carrying Amount | 77,901,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Accumulated Depreciation | 17,637,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_CortlandtTowneCenterMember |  |  |
Fund III [Member] | Heritage Shops [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 24,500,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Initial Cost to Company of Land | 13,131,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Initial Cost to Company of Buildings and Improvements | 15,409,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Costs Capitalized Subsequent to Acquisition | 386,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Carrying Amount of Land | 13,131,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Carrying Amount of Buildings and Improvements | 15,795,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Total Carrying Amount | 28,926,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Accumulated Depreciation | 2,012,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_HeritageShopsMember |  |  |
Fund III [Member] | 654 Broadway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 9,000,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Initial Cost to Company of Land | 9,040,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Initial Cost to Company of Buildings and Improvements | 3,654,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,435,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Carrying Amount of Land | 9,040,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Carrying Amount of Buildings and Improvements | 5,089,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Total Carrying Amount | 14,129,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Accumulated Depreciation | 352,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A654BroadwayMember |  |  |
Fund III [Member] | New Hyde Park Shopping Center [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 11,720,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Initial Cost to Company of Land | 3,016,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,733,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Costs Capitalized Subsequent to Acquisition | 4,019,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Carrying Amount of Land | 3,016,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Carrying Amount of Buildings and Improvements | 11,752,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Total Carrying Amount | 14,768,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Accumulated Depreciation | 1,050,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NewHydeParkShoppingCenterMember |  |  |
Fund III [Member] | 640 Broadway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 22,564,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Initial Cost to Company of Land | 12,503,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Initial Cost to Company of Buildings and Improvements | 19,960,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Costs Capitalized Subsequent to Acquisition | 6,430,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Carrying Amount of Land | 12,503,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Carrying Amount of Buildings and Improvements | 26,390,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Total Carrying Amount | 38,893,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Accumulated Depreciation | 1,814,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_A640BroadwayMember |  |  |
Fund III [Member] | Lincoln Park Centre LLC [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 28,000,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Initial Cost to Company of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Initial Cost to Company of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Carrying Amount of Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Carrying Amount of Buildings and Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Total Carrying Amount | 0 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Accumulated Depreciation | 0 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LincolnParkCentreLlcMember |  |  |
Fund III [Member] | 3780 to 3858 Nortrand Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 12,047,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Initial Cost to Company of Land | 6,229,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 11,216,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 3,128,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Carrying Amount of Land | 6,229,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 14,344,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Total Carrying Amount | 20,573,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Accumulated Depreciation | 594,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIiiMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ThreeSevenEightZerotoThreeEightFiveEightNortrandAvenueMember |  |  |
Fund IV [Member] | 210 Bowery LLC [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 4,600,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Initial Cost to Company of Land | 1,875,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Initial Cost to Company of Buildings and Improvements | 5,625,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Costs Capitalized Subsequent to Acquisition | 22,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Carrying Amount of Land | 1,875,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Carrying Amount of Buildings and Improvements | 5,647,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Total Carrying Amount | 7,522,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Accumulated Depreciation | 281,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_TwoOneZeroBoweryLlcMember |  |  |
Fund IV [Member] | Paramus Plaza [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 12,600,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Initial Cost to Company of Land | 11,052,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Initial Cost to Company of Buildings and Improvements | 7,037,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Costs Capitalized Subsequent to Acquisition | 1,852,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Carrying Amount of Land | 11,052,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Carrying Amount of Buildings and Improvements | 8,889,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Total Carrying Amount | 19,941,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Accumulated Depreciation | 272,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_ParamusPlazaMember |  |  |
Fund IV [Member] | 1151 Third Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 12,481,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Initial Cost to Company of Land | 8,306,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 9,685,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 978,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Carrying Amount of Land | 8,306,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 10,663,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Total Carrying Amount | 18,969,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Accumulated Depreciation | 321,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_OneOneFiveOneThirdAvenueMember |  |  |
Fund IV [Member] | Lake Montclair [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 15,284,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Initial Cost to Company of Land | 7,077,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Initial Cost to Company of Buildings and Improvements | 12,028,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Costs Capitalized Subsequent to Acquisition | 25,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Carrying Amount of Land | 7,077,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Carrying Amount of Buildings and Improvements | 12,053,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Total Carrying Amount | 19,130,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Accumulated Depreciation | 381,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_LakeMontclairMember |  |  |
Fund IV [Member] | 938 West North Avenue [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 12,500,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Initial Cost to Company of Land | 2,314,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Initial Cost to Company of Buildings and Improvements | 17,067,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Costs Capitalized Subsequent to Acquisition | 34,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Carrying Amount of Land | 2,314,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Carrying Amount of Buildings and Improvements | 17,101,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Total Carrying Amount | 19,415,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Accumulated Depreciation | 449,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_NineThreeEightWestNorthAvenueMember |  |  |
Fund IV [Member] | 17 E. 71st Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Initial Cost to Company of Land | 7,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Initial Cost to Company of Buildings and Improvements | 21,000,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Costs Capitalized Subsequent to Acquisition | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Carrying Amount of Land | 7,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Carrying Amount of Buildings and Improvements | 21,000,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Total Carrying Amount | 28,000,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Accumulated Depreciation | 86,000 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_SeventeenEastSeventyFirstStreetMember |  |  |
Fund IV [Member] | Real Estate Under Development [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 265,015,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Initial Cost to Company of Land | 30,830,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Initial Cost to Company of Buildings and Improvements | 19,253,000 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Costs Capitalized Subsequent to Acquisition | 397,307,000 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Carrying Amount of Land | 54,215,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Carrying Amount of Buildings and Improvements | 393,175,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Total Carrying Amount | 447,390,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |
Accumulated Depreciation | 0 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = akr_FundIvMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = akr_RealEstateUnderDevelopmentMember |  |  |

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