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Debt - Mortgages and Other Notes Payable - Additional Information (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2021 | Oct. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Mortgage | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) Mortgage | Dec. 31, 2020 USD ($) Mortgage | Sep. 29, 2021 | Mar. 31, 2021 USD ($) | Jul. 31, 2020 USD ($) | Feb. 29, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | $ 101,450 |  | $ 158,468 | $ 101,450 |  |  |  |
Maximum borrowing capacity |  |  |  |  | 900,000 |  |  |  |  |
Canton Marketplace |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage |  |  |  |  | $ 31,800 |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | Mortgage |  |  |  |  | 9 |  |  |  |  |
Number of properties collateralized | Mortgage |  |  | 42 |  | 38 | 42 |  |  |  |
Mortgages | Canton Marketplace |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage |  |  |  |  | $ 31,800 |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 3.35% |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | May 01, 2023 |  |  |  |  |
Mortgages | Subscription Line |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | Mortgage |  |  |  |  |  | 7 |  |  |  |
Notes receivable, net |  |  | $ 46,000 |  |  | $ 46,000 |  | $ 37,200 |  |
Note receivable principal amount |  |  |  |  |  |  |  | $ 1,700 |  |
Mortgages | Subscription Line 1 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 51,300 |  |  | 51,300 |  |  |  |
Mortgages | Subscription Line 2 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 40,000 | $ 125,100 |  | 40,000 |  |  |  |
Note receivable principal amount |  |  |  | 6,500 | $ 10,200 |  |  |  |  |
Mortgages | Subscription Line 3 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 88,000 |  | 53,000 | 88,000 |  |  |  |
Fund IV |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 23,500 |  |  |  |  |
Fund IV | Bridge Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 79,200 |  |  |  |  |  |
Repayments of debt |  |  |  | $ 10,000 |  |  |  |  |  |
Maturity date | Jun. 30, 2021 |  |  | Dec. 31, 2021 |  |  |  |  |  |
LIBOR plus |  |  |  |  | 2.50% |  | 2.00% |  |  |
LIBOR floor |  |  |  |  | 0.25% |  |  |  |  |
Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Holdback mortgage loan |  |  | 23,800 |  |  | 23,800 |  |  |  |
Holdback mortgage loan outstanding |  |  | 18,900 |  |  | 18,900 |  |  |  |
Holdback mortgage loan drew an additional |  |  |  |  | $ 1,000 |  |  |  | $ 900 |
Fund IV | Mortgages One | Colonie Plaza - Albany, NY |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 11,600 |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 26,300 |  |  |  |
Derivative, notional amount |  |  |  |  | 539,636 |  |  |  |  |
Core Portfolio | Sixty Orange Street | Disposed of by sale |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | 6,700 |  |  |  |  |
Scheduled principal payment |  |  |  |  | 6,300 |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt default, amount |  |  |  |  | 26,300 |  |  |  |  |
Debt instrument, maturity date |  |  |  | Jul. 01, 2016 |  |  |  |  |  |
Gain (loss) on litigation settlement |  | $ 30,000 |  |  |  |  |  |  |  |
Acquisition of noncontrolling interest |  | $ 15,900 |  |  |  |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio | Acadia's OP Ownership |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity interest held by Operating Partnership |  | 77.78% |  |  |  |  |  |  |  |
Core Portfolio | Mortgages | Realized and Unrealized Holding Gains (Losses) on Investments and Other | Brandywine Portfolio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on debt extinguishment |  |  | 18,300 |  |  |  |  |  |  |
Proportionate share |  | $ 4,100 |  |  |  |  |  |  |  |
Fund II | Mortgages |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 200,000 |  |  | 200,000 |  |  |  |
Fund III and Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Holdback mortgage loan |  |  | 103,400 |  |  | 103,400 |  |  |  |
Fund Loans Repaid |  |  | 11,500 |  |  | 11,500 |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 30,400 |  |  | $ 30,400 |  |  |  | $ 50,000
Interest Rate Swaps | New Towne Plaza |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | 16,700 |  |  |  |  |
Cash proceeds from swaps |  |  |  |  | $ 3,400 |  |  |  |  |

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