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FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Carrying (Reported) Amount, Fair Value Disclosure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Receivable and Preferred Equity Investments | $ 96,307 | $ 126,656
Mortgage, Convertible Notes and Other Notes Payable | 1,074,029 | 1,039,997
Estimate of Fair Value, Fair Value Disclosure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Receivable and Preferred Equity Investments | 96,307 | 126,656
Mortgage, Convertible Notes and Other Notes Payable | $ 1,092,818 | $ 1,056,457

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- Definition Notes Receivable and Preferred Equity Investments, Fair Value + References No definition available. + Details
Name: | akr_NotesReceivableandPreferredEquityInvestmentsFairValue
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant