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ACQUISITION AND DISPOSITION OF PROPERTIES, DISCONTINUED OPERATIONS AND PROPERTIES HELD FOR SALE Acquisitions (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |
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Dec. 31, 2014 sqft | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 510,219 akr_GrossLeasableArea |  | 510,219 akr_GrossLeasableArea |  |
Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 368,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 368,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | $ 473,200,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 84,800,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Acquisition related costs | 4,800,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Fund III [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs | 200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember |  |  |  |
Fund IV [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 472,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  | 472,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |
Purchase Price | 106,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
Acquisition related costs | 2,700,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
11 East Walton [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 6,738 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 6,738 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 44,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
61 Main Street [Member] | West Port, Connecticut [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 3,400 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 3,400 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 7,300,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
865 W. North Avenue [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 16,000 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 16,000 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 14,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_EightSixFiveWestNorthAvenueMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
252 - 254 Greenwich Avenue [Member] | Greenwich, Connecticut [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 9,172 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 9,172 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 24,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoThroughTwoFiveFourGreenwichAvenueMember / invest_InvestmentGeographicRegionAxis = akr_GreenwichConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
152 - 154 Spring Street [Member] | New York, New York [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 2,936 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 2,936 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 38,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_OneFiveTwoThroughOneFiveFourSpringStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
2520 Flatbush Avenue [Member] | Brooklyn, New York [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 29,114 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 29,114 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 17,100,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_TwoFiveTwoZeroFlatbushAvenueMember / invest_InvestmentGeographicRegionAxis = akr_BrooklynNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Bedford Green [Member] | Bedford, New York [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 90,472 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 90,472 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 46,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 29,800,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_BedfordGreenMember / invest_InvestmentGeographicRegionAxis = akr_BedfordNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
131 - 135 Prince Street [Member] | Common OP Units [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Issuance of OP units in exchange for ownership, number of shares | 1.4 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / us-gaap_StatementClassOfStockAxis = akr_CommonOperatingPartnershipUnitsMember |  |  |  |
131 - 135 Prince Street [Member] | New York, New York [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 3,200 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] | 3,200 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] |
Purchase Price | 51,400,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_OneThreeOneThroughOneThreeFivePrinceStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1] |  |  |
Shops At Grand Avenue [Member] | Queens, New York [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 99,975 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 99,975 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 56,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_ShopsAtGrandAvenueMember / invest_InvestmentGeographicRegionAxis = akr_QueensNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
201 Needham Street [Member] | Newton, Massachusetts [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 20,409 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 20,409 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Purchase Price | 10,100,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
Debt Assumption | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_TwoZeroOneNeedhamStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewtonMassachusettsMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |  |  |
840 North Michigan [Member] | Common OP Units [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Issuance of OP units in exchange for ownership, number of shares | 0.2 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / us-gaap_StatementClassOfStockAxis = akr_CommonOperatingPartnershipUnitsMember |  |  |  |
840 North Michigan [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 87,135 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] | 87,135 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] |
Percent Owned | 88.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] | 88.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] |
Purchase Price | 163,200,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] |  |  |
Debt Assumption | 55,000,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_EightFourZeroNorthMichiganMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [2] |  |  |
Arundel Plaza [Member] | Fund III [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase Price |  |  | 3,100,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_ArundelPlazaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember |  |
Broughton Street Portfolio [Member] | Savannah, Georgia [Member] | Fund IV [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 218,076 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [3] | 218,076 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [3] |
Percent Owned | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [3] | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [3] |
Purchase Price | 33,900,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [3] |  |  |
Number of properties acquired | 24 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
Number of asset acquisitions | 9 akr_NumberofAssetAcquisitions / us-gaap_BusinessAcquisitionAxis = akr_BroughtonStreetPortfolioMember / invest_InvestmentGeographicRegionAxis = akr_SavannahGeorgiaMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
Eden Square [Member] | Bear, Delaware [Member] | Fund IV [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 235,508 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EdenSquareMember / invest_InvestmentGeographicRegionAxis = akr_BearDelawareMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [4] | 235,508 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_EdenSquareMember / invest_InvestmentGeographicRegionAxis = akr_BearDelawareMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [4] |
Percent Owned | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EdenSquareMember / invest_InvestmentGeographicRegionAxis = akr_BearDelawareMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [4] | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_EdenSquareMember / invest_InvestmentGeographicRegionAxis = akr_BearDelawareMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [4] |
Purchase Price | 25,400,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_EdenSquareMember / invest_InvestmentGeographicRegionAxis = akr_BearDelawareMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [4] |  |  |
17 E. 71st Street [Member] | New York, New York [Member] | Fund IV [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 9,330 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_SeventeenEastSeventyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  | 9,330 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_SeventeenEastSeventyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_SeventeenEastSeventyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_SeventeenEastSeventyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |
Purchase Price | 28,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_SeventeenEastSeventyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |  |  |  |
27 E. 61st Street [Member] | New York, New York [Member] | Fund IV [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
GLA (in square feet) | 9,637 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwentySevenEastSixtyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [5] | 9,637 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_TwentySevenEastSixtyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [5] |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwentySevenEastSixtyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [5] | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_TwentySevenEastSixtyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [5] |
Purchase Price | 19,300,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_TwentySevenEastSixtyFirstStreetMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [5] |  |  |
Acquisitions in 2013 [Member] |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Land | 80,524,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 80,524,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 65,804,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member
Buildings and Improvements | 180,605,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 180,605,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 245,925,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 56,871,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 56,871,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 0 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (6,271,000)akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | (6,271,000)akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 0 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member
Total Consideration | 311,729,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 311,729,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  | 311,729,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member
Adjustments |  |  |  |  |
Land | 14,720,000 akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  |  |  |
Buildings and Improvements | (65,320,000)akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 56,871,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (6,271,000)akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  |  |  |
Total Consideration | 0 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2013Member |  |  |  |
Acquisitions In 2014 [Member] |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Land | 145,833,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  | 145,833,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  |
Buildings and Improvements | 411,896,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  | 411,896,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (6,434,000)akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  | (6,434,000)akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  |
Above-below market debt assumed (included in Mortgages and other notes payable) | (2,100,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  | (2,100,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  |
Total Consideration | $ 549,195,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  | $ 549,195,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |  |
[1] | This acquisition was primarily funded with the issuance of 1.4 million Common OP Units.
[2] | As the tenancy in common partner to this investment maintains operating control over this investment, it is accounted for under the equity method. This acquisition was partially funded with the issuance of 0.2 million Common OP Units.
[3] | The Broughton Street Portfolio consists of 24 properties. As the joint venture partner to these investments maintains operating control over the investments, these are accounted for under the equity method. Of the 24 properties, nine of them are accounted for as asset acquisitions as they were purchased vacant and require future development.
[4] | As the joint venture partner to this investment maintains operating control over this investment, it is accounted for under the equity method.
[5] | This property was purchased vacant and requires future development and as such, it is accounted for as an asset acquisition.

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