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SHARE INCENTIVE PLAN (Tables) | 12 Months Ended
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Dec. 31, 2012
Share Incentive Plan [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity under all option arrangements as of December 31, 2012 and 2011, and changes during the years then ended, is presented below: ACADIA REALTY TRUST AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 15. Share Incentive Plan, continued
Options |  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (dollars in thousands)
Outstanding and exercisable at December 31, 2010 |  | 152,283 |  |  | $ | 18.20 |  |  | 4.5 |  |  | $ | 6 |
Granted |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  | (2,000 | ) |  | 8.21 |  |  | — |  |  | 24 |
Forfeited or Expired |  | — |  |  | — |  |  | — |  |  | — |
Outstanding and exercisable at December 31, 2011 |  | 150,283 |  |  | 18.33 |  |  | 3.5 |  |  | 272 |
Granted |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  | (12,636 | ) |  | 14.23 |  |  | — |  |  | 137 |
Forfeited or Expired |  | — |  |  | — |  |  | — |  |  | — |
Outstanding and exercisable at December 31, 2012 |  | 137,647 |  |  | $ | 18.71 |  |  | 2.6 |  |  | $ | 877 |
Schedule of Unvested Restricted Shares and LTIP Units [Table Text Block] | A summary of the status of the Company’s unvested Restricted Shares and LTIP Units as of December 31, 2012 and 2011 and changes during the years then ended is presented below: ACADIA REALTY TRUST AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 15. Share Incentive Plan, continued
Unvested Restricted Shares and LTIP Units |  | Restricted Shares |  | Weighted Grant-Date Fair Value |  | LTIP Units |  | Weighted Grant-Date Fair Value
Unvested at December 31, 2010 |  | 153,430 |  |  | $ | 19.75 |  |  | 562,739 |  |  | $ | 16.61 |
Granted |  | 32,970 |  |  | 19.13 |  |  | 431,412 |  |  | 19.08 |
Vested |  | (104,196 | ) |  | 20.95 |  |  | (153,895 | ) |  | 16.78 |
Forfeited |  | (6,465 | ) |  | 14.73 |  |  | (1,358 | ) |  | 16.86 |
Unvested at December 31, 2011 |  | 75,739 |  |  | 18.25 |  |  | 838,898 |  |  | 17.85 |
Granted |  | 30,153 |  |  | 21.88 |  |  | 281,714 |  |  | 21.99 |
Vested |  | (43,819 | ) |  | 19.29 |  |  | (176,926 | ) |  | 16.92 |
Forfeited |  | (1,157 | ) |  | 16.02 |  |  | — |  |  | — |
Unvested at December 31, 2012 |  | 60,916 |  |  | $ | 19.36 |  |  | 943,686 |  |  | $ | 19.27 |

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- Definition Schedule of Unvested Restricted Shares and LTIP Units [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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