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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges | $ 9,925 | $ 0 |  | $ 9,925 | $ 51,549 |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | 9,925 |  | $ 85,598
Fair Value, Measurements, Nonrecurring | Acadia Realty Trust |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | $ 2,294 |  | $ 20,594
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 Fair Value of Net Assets 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 Fair Value of Net Assets Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  | $ 2,551 |  |  |
717 N. Michigan Avenue, Chicago, IL | 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 |  |  |  |  |  | $ 17,392
717 N. Michigan Avenue, Chicago, IL | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 4,021
110 University, 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 |  |  |  |  |  | $ 16,238
110 University, New York, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 3,754
Fifth Wall Investment | Fair Value, Measurements, Nonrecurring | Core Portfolio | Level 3 Inputs Fair Value of Net Assets Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Triggering Event |  |  |  |  |  | Decline in fair value
Impairment charges |  |  |  |  |  | $ 419
Fifth Wall Investment | Fair Value, Measurements, Nonrecurring | Core Portfolio | Acadia Realty Trust | Level 3 Inputs Fair Value of Net Assets Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 419
210 Bowery, Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Triggering Event |  |  |  | Reduced projected operating income |  |
Impairment charges |  |  |  | $ 3,016 |  |
210 Bowery, Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | $ 697 |  |
27 E. 61st Street Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Triggering Event |  |  |  | Reduced projected operating income |  |
Impairment charges |  |  |  | $ 6,909 |  |
27 E. 61st Street Manhattan, NY | Fair Value, Measurements, Nonrecurring | Fund IV | Acadia Realty Trust | Level 3 Inputs Projections |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | $ 1,597 |  |

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