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ACQUISITION AND DISPOSITION OF PROPERTIES, DISCONTINUED OPERATIONS AND PROPERTIES HELD FOR SALE Held For Sale (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 property | Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract] |  |
Number of properties held-for-sale | 2 akr_NumberofPropertiesHeldforSale |
Assets of discontinued operations and properties held for sale | $ 56,073 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | $ 20,434 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Liabilities of discontinued operations and properties held for sale | $ 25,500 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation | $ 2,507 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation

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- Definition Number of Properties Held-for-Sale + References No definition available. + Details
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Namespace Prefix: | akr_
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Balance Type: | na
Period Type: | duration

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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
Name: | us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant