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Commitments and Contingencies (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |
Contractual obligation | $ 103.7 | $ 85.4
Letters of credit, oustanding amount | 11.3 | 11.3
Unconsolidated joint venture debt, pro rata portion, if not paid by joint venture | $ 162.3 | $ 165.7

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- Definition Other Commitment, Unconsolidated Joint Venture Debt + References No definition available. + Details
Name: | akr_OtherCommitmentUnconsolidatedJointVentureDebt
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant