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LONG-TERM INCENTIVE COMPENSATION (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 5 years |  |
Share-based compensation expense | $ 1,889,000 us-gaap_ShareBasedCompensation | $ 2,087,000 us-gaap_ShareBasedCompensation |
Trustee fee expense | 200,000 akr_TrusteeFeeExpense | 100,000 akr_TrusteeFeeExpense |
Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 5 years |  |
Percent of awards issued to officers subject to performance measures | 17.00%akr_PercentOfAwardsIssuedToOfficersSubjectToPerformanceMeasures / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |
Other Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |
Percent of awards issued to officers subject to performance measures | 24.00%akr_PercentOfAwardsIssuedToOfficersSubjectToPerformanceMeasures / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember |  |
Other Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |
Senior Executives | Long Term Investment Alignment Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum percentage of promote to be awarded as share based compensation awards |  |  | 25.00%akr_MaximumPercentageOfPromoteToBeAwardedAsShareBasedCompensationAwards / us-gaap_PlanNameAxis = akr_LongTermInvestmentAlignmentProgramMember / us-gaap_TitleOfIndividualAxis = akr_SeniorExecutivesMember
Senior Executives | Long Term Investment Alignment Program | Fund IV |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum percentage of promote to be awarded as share based compensation awards |  |  | 20.00%akr_MaximumPercentageOfPromoteToBeAwardedAsShareBasedCompensationAwards / us-gaap_PlanNameAxis = akr_LongTermInvestmentAlignmentProgramMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember / us-gaap_TitleOfIndividualAxis = akr_SeniorExecutivesMember
LTIP Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 247,863 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember |  |
LTIP Units | Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 236,924 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |
LTIP Units | Other Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 7,879 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember |  |
LTIP Units | Other Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 3,060 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = akr_OtherEmployeesMember |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 8,357 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Restricted Stock | Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |
Restricted Stock | Other Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 1,308 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember |  |
Restricted Stock | Other Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | 7,049 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = akr_OtherEmployeesMember |  |
LTIP Units and Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock granted during period, value, share-based compensation, net of forfeitures | 8,800,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember |  |
Share-based compensation expense | 500,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember |  |
Long term incentive and share based compensation expense | $ 1,800,000 akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember | $ 1,400,000 akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember |
Vesting at the end of year three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage | 60.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember |  |
Vesting ratably over last two years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage | 40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember |  |

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- Definition Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards. Promote is defined as the amount above a certain performance measurement threshold. + References No definition available. + Details
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- Definition Percent of Awards Issued to Officers Subject to Performance Measures + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 30 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6743629&loc=d3e3913-113898 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 30 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418191&loc=d3e15009-113911 + Details
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