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NOTES RECEIVABLE, PREFERRED EQUITY, AND OTHER REAL ESTATE RELATED INVESTMENTS Schedule of Allowance for Credit Losses on Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of period | $ 3,681 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 3,681 us-gaap_FinancingReceivableAllowanceForCreditLosses
Additional reserves | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries | (2,724)us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Charge-offs and reclassifications | (957)akr_FinancingReceivableAllowanceforCreditLossesChargeOffsAndReclassifications | 0 akr_FinancingReceivableAllowanceforCreditLossesChargeOffsAndReclassifications
Balance at end of period | $ 0 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 3,681 us-gaap_FinancingReceivableAllowanceForCreditLosses

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- Definition Financing Receivable, Allowance for Credit Losses, Charge Offs And Reclassifications + References No definition available. + Details
Name: | akr_FinancingReceivableAllowanceforCreditLossesChargeOffsAndReclassifications
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration