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MORTGAGE AND OTHER NOTES PAYABLE (Details) (USD $) | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 9 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2013 Unsecured Debt | Jan. 31, 2013 Unsecured Debt | Dec. 31, 2012 Secured Debt | Mar. 31, 2013 Construction Loans | Sep. 30, 2013 Construction Loans | Sep. 30, 2013 Libor Plus 1.9% Mortgage Note | Jan. 31, 2013 Libor Plus 1.9% Mortgage Note Secured Debt | Sep. 30, 2013 Libor Plus 2.65% Mortage Note | Feb. 28, 2013 Libor Plus 2.65% Mortage Note Secured Debt | Sep. 30, 2013 Libor Plus 6% | Mar. 31, 2013 Libor Plus 6% Secured Debt | Mar. 31, 2013 Libor Plus 2.5% Secured Debt | Sep. 30, 2013 Libor Plus 2.5% Mortgages | Sep. 30, 2013 First Mortgage Loan, Libor Plus 3.30% | Mar. 31, 2013 First Mortgage Loan, Libor Plus 3.30% Mortgages | Mar. 31, 2013 LIBOR Plus 2.5% Mortgage Note Secured Debt | Apr. 30, 2013 LIBOR Plus 1.75%, Mortgage Note Mortgages | Jun. 30, 2013 LIBOR Plus 1.95%, Mortgage Note Mortgages | Jun. 30, 2013 LIBOR Plus 1.95%, Mortgage Note Due 2014 Mortgages | Sep. 30, 2013 LIBOR Plus 1.95%, Mortgage Note Due 2014 Mortgages | Aug. 31, 2013 LIBOR Plus 2.03% Mortgage Note Mortgages tranch | Aug. 31, 2013 LIBOR Plus 1.65% Mortgage Note | Sep. 30, 2013 Construction Loan Under the United States Imigration Investment Program | Dec. 31, 2012 Construction Loan Under the United States Imigration Investment Program | Sep. 30, 2013 Minimum Unsecured Debt | Sep. 30, 2013 Minimum Secured Debt | Sep. 30, 2013 Maximum Unsecured Debt | Sep. 30, 2013 Maximum Secured Debt | Sep. 30, 2013 Fee if the Outstanding Pringipal of Aggregate Commitment is less than or equal to 50% Secured Debt | Sep. 30, 2013 Fee if the Outstanding Pringipal of Aggregate Commitment is Greater than 50% Secured Debt | Sep. 30, 2013 Before March 2013 LIBOR Plus 2.5% Mortgage Note Mortgages | Sep. 30, 2013 March through July 2013 LIBOR Plus 3.0% Mortgage Note Mortgages | Sep. 30, 2013 August 2013 Through July 2014 LIBOR Plus 3.5% Mortgage Note Mortgages | Sep. 30, 2013 August 2014 and Thereafter LIBOR Plus 1.75%, Mortgage Note Mortgages | Sep. 30, 2013 August 2014 and Thereafter LIBOR Plus 1.95%, Mortgage Note Mortgages | Sep. 30, 2013 August 2014 and Thereafter LIBOR Plus 4.0% Mortgage Note Mortgages | Sep. 30, 2013 LIBOR Construction Loans | Sep. 30, 2013 LIBOR Libor Plus 1.9% Mortgage Note | Sep. 30, 2013 LIBOR Libor Plus 2.65% Mortage Note | Sep. 30, 2013 LIBOR Libor Plus 6% | Sep. 30, 2013 LIBOR Libor Plus 2.5% Mortgages | Sep. 30, 2013 LIBOR First Mortgage Loan, Libor Plus 3.30% | Sep. 30, 2013 LIBOR LIBOR Plus 1.95%, Mortgage Note Due 2014 Mortgages | Sep. 30, 2013 LIBOR Minimum Unsecured Debt | Sep. 30, 2013 LIBOR Maximum Unsecured Debt | Sep. 30, 2013 LIBOR Before March 2013 LIBOR Plus 2.5% Mortgage Note Mortgages | Sep. 30, 2013 LIBOR March through July 2013 LIBOR Plus 3.0% Mortgage Note Mortgages | Sep. 30, 2013 LIBOR August 2013 Through July 2014 LIBOR Plus 3.5% Mortgage Note Mortgages | Sep. 30, 2013 LIBOR August 2014 and Thereafter LIBOR Plus 1.75%, Mortgage Note Mortgages | Sep. 30, 2013 LIBOR August 2014 and Thereafter LIBOR Plus 1.95%, Mortgage Note Mortgages | Sep. 30, 2013 LIBOR August 2014 and Thereafter LIBOR Plus 4.0% Mortgage Note Mortgages
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit facility |  | $ 150,000,000 | $ 64,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to total asset ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, unused borrowing capacity fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New mortgage loans |  |  |  |  |  |  | 16,500,000 |  | 13,000,000 |  |  | 29,500,000 |  |  | 20,000,000 |  | 8,600,000 | 52,500,000 | 4,600,000 |  |  | 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of loan extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt refinanced |  |  |  | 50,000,000 |  |  |  |  |  |  | 28,900,000 |  |  |  |  | 20,000,000 |  |  |  |  | 73,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-tem debt, number of debt tranches |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction loan, amount released into restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction loan, amount withdrawn from restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction loan, amount released into restricted Cash, amount available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR
Basis spread on variable rate |  |  |  |  | 3.30% | 1.90% |  | 2.65% |  | 6.00% |  |  | 2.50% | 5.00% |  |  |  |  |  | 1.95% | 2.03% | 1.65% |  |  | 1.55% |  | 2.20% |  |  |  | 2.50% | 3.00% | 3.50% | 1.75% | 1.65% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Construction Loan, Amount Released into Restricted Cash + References No definition available. + Details
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Balance Type: | credit
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- Definition Construction Loan, Amount Released into Restricted Cash, Amount Available + 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 Construction Loan, Amount Withdrawn From Restricted Cash + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Debt Instrument, Number of Debt Tranches + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Definition Length of Loan Extension + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Debt to Asset Ratio + References No definition available. + Details
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- Definition Long-term Debt, Refinanced Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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