XML 29 R76.htm IDEA: XBRL DOCUMENT v2.4.1.9
SHARE INCENTIVE PLAN (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2014
Feb. 28, 2014
Dec. 31, 2012
Jun. 04, 2014
Sep. 30, 2014
Dec. 31, 2013
Mar. 31, 2014
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Trustee fees $ 0.2us-gaap_TrusteeFees              
Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period   5 years            
Percent of awards issued to officers subject to performance measures   16.00%akr_PercentOfAwardsIssuedToOfficersSubjectToPerformanceMeasures
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
           
2006 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in number of shares authorized     1,900,000akr_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= akr_A2006PlanMember
         
Number of shares authorized     2,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= akr_A2006PlanMember
         
Employee Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option term     10 years          
Options outstanding and vested to officers and employees (in shares) 46,347akr_ShareBasedCompensationShareBasedPaymentAwardOptionsOutstandingAndVested
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Employee Stock Option [Member] | Trustee [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 10 years              
Number of vesting anniversaries 3akr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberofVestingAnniversaries
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
             
Options outstanding and vested to non-employee trustees (in shares) 9,000akr_ShareBasedGoodsAndNonemployeeServicesTransactionOptionsOutstandingAndVested
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
             
LTIP Units [Member] | Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures   326,230us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
           
LTIP Units [Member] | Trustee [Member] | Vesting on first anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures       1,518us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsMember
/ us-gaap_TitleOfIndividualAxis
= akr_TrusteeMember
/ us-gaap_VestingAxis
= akr_SharebasedCompensationTrancheOneMember
       
Restricted Stock [Member] | Trustee [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures       17,118us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
       
Award vesting period       3 years        
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date       6,276akr_ShareBasedCompensationGrantedForServiceVestingOnOneYearAnniversaryOfGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
       
Shares granted to trustees for trustee fees begin vesting on two year anniversary of grant date       10,842akr_ShareBasedCompensationGrantedForServiceVestingAfterOneYearAnniversaryOfGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
       
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date       33.00%akr_ShareBasedCompensationGrantedForServiceVestingRateBeginningOnFirstAnniversaryOfGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
       
Number of vesting anniversaries       3akr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberofVestingAnniversaries
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= akr_TrusteeMember
       
Restricted Stock [Member] | Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures   918us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
           
Restricted Stock [Member] | Other Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures   10,527us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= akr_OtherEmployeesMember
           
LTIP Units and Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total value of restricted shares and LTIP units as of the grant date     11,900,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
  11,400,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
     
Weighted average grant date fair value, grants (in dollars per share) $ 26.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
  22.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
    $ 26.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
   
Unit based compensation 6,200,000akr_LongTermIncentiveAndShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
        500,000akr_LongTermIncentiveAndShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
   
LTIP Units and Restricted Stock [Member] | General and Administrative Expense [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unit based compensation 6,200,000akr_LongTermIncentiveAndShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
  3,600,000akr_LongTermIncentiveAndShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
    7,300,000akr_LongTermIncentiveAndShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
   
LTIP Units and Restricted Stock [Member] | Chief Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued during period, share-based compensation, net of forfeitures             114,198us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LtipUnitsAndRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
 
Award vesting period             5 years  
Long Term Investment Alignment Program [Member] | Senior Executives [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total value of restricted shares and LTIP units as of the grant date $ 0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LongTermInvestmentAlignmentProgramMember
/ us-gaap_TitleOfIndividualAxis
= akr_SeniorExecutivesMember
            $ 0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= akr_LongTermInvestmentAlignmentProgramMember
/ us-gaap_TitleOfIndividualAxis
= akr_SeniorExecutivesMember
Max percentage of future fund III promote that may be awarded to senior executives               25.00%akr_MaximumPercentageOfPromoteToBeAwardedAsShareBasedCompensationAwards
/ us-gaap_AwardTypeAxis
= akr_LongTermInvestmentAlignmentProgramMember
/ us-gaap_TitleOfIndividualAxis
= akr_SeniorExecutivesMember