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Financial Instruments and Fair Value Measurements - Schedule of Items Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges | $ 0 |  |  | $ 1,400 | $ 51,549 | $ 1,400 |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 51,549 |  |  |  |  | $ 1,721
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 12,400 |  |  |  |  | $ 395
Cortlandt Crossing, Mohegan Lake, NY | Fair Value, Measurements, Nonrecurring | Fund III | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  | Reduced holding period, reduced projected operating income |  |  |  |  |
Impairment charges |  | $ 27,402 |  |  |  |  |
Cortlandt Crossing, Mohegan Lake, NY | Fair Value, Measurements, Nonrecurring | Fund III | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 6,726 |  |  |  |  |
654 Broadway, New York, NY | Fair Value, Measurements, Nonrecurring | Fund III | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  | Reduced holding period |  |  |  |  |
Impairment charges |  | $ 6,398 |  |  |  |  |
654 Broadway, New York, NY | Fair Value, Measurements, Nonrecurring | Fund III | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 1,570 |  |  |  |  |
146 Geary Street, San Francisco, CA | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  | Reduced holding period, reduced projected operating income |  |  |  |  |
Impairment charges |  | $ 6,718 |  |  |  |  |
146 Geary Street, San Francisco, CA | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 1,553 |  |  |  |  |
801 Madison Avenue, New York, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  | Reduced holding period, reduced projected operating income |  |  |  |  |
Impairment charges |  | $ 11,031 |  |  |  |  |
801 Madison Avenue, New York, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 2,551 |  |  |  |  |
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Contract Sales Price |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  |  | Reduced selling price |  |  |  |
Impairment charges |  |  | $ 321 |  |  |  |
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Offering Price |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Triggering Event |  |  |  | Reduced selling price |  |  |
Impairment charges |  |  |  | $ 1,400 |  |  |
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Contract Sales Price |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  | $ 74 |  |  |  |
210 Bowery Residential Units | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Offering Price |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  | $ 321 |  |  |

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