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SUBSEQUENT EVENTS (Details) - At The Market Equity Program - USD ($) | Jul. 29, 2016 | Jun. 30, 2016
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Subsequent Event [Line Items] |  |
Aggregate value of offerings |  | $ 200,000,000
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Aggregate value of offerings | $ 250,000,000.0 |

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- Definition Common Stock, Shares Authorized Not Issued, Value + References No definition available. + Details
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Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=akr_AtMarketEquityProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |