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Debt - Mortgage Payable - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) | Dec. 31, 2012 USD ($) | Dec. 30, 2021 | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | $ 153,886,000 | $ 100,882,000 | $ 114,943,000 |  |  |  |  |  |  | $ 111,775,000
Maximum borrowing capacity |  |  | 900,000,000.0 |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 26,300,000 |  |  |  |  |  |  |  |
Gain on debt extinguishment |  |  | 0 | 18,339,000 | 0 |  |  |  |  |  |  |
Canton Marketplace |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage |  |  | 31,800,000 |  |  |  |  |  |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | 16,700,000 | 30,400,000 |  |  |  |  |  |  | $ 50,000,000.0 |
Cash proceeds from swaps |  |  | 3,400,000 |  |  |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payment |  |  |  | 6,100,000 |  |  |  |  |  |  |  |
Mortgages | Canton Marketplace |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage |  |  | $ 31,800,000 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | May 01, 2023 |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 3.35% |  |  |  |  |  |  |  |  |
Mortgages | Monroe Marketplace [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage |  |  | $ 29,200,000 |  |  |  |  |  |  |  |  |
Maturity date |  |  | Nov. 12, 2026 |  |  |  |  |  |  |  |  |
Mortgages | Subscription Line |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  | $ 46,000,000.0 |  |  |  |  |  | $ 37,700,000 |  |
Number of mortgage loans | Loan |  |  |  | 7 |  |  |  |  |  |  |  |
Mortgage Loan Principal Amount |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |
Mortgages | Subscription Line 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | $ 14,800,000 | $ 51,300,000 |  |  |  |  |  |  |  |
Mortgage Loan Principal Amount |  |  | 3,000,000.0 |  |  |  |  | $ 10,200,000 |  |  |  |
Outstanding balance |  |  | 64,200 |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 59,200 | 79,200 |  |  |  |  |  |  |  |
Mortgages | Subscription Line 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  | 40,000,000.0 |  |  |  |  | $ 125,700,000 |  |  |
Mortgage Loan Principal Amount |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |
Mortgages | Subscription Line 3 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  |  |  | $ 53,100,000 |  |  |  |
Holdback mortgage loan outstanding |  |  |  | 52,000,000.0 |  |  |  |  |  |  |  |
SOFR | Mortgages | Monroe Marketplace [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Basis Spread On Variable Rate1 |  |  | 2.76% |  |  |  |  |  |  |  |  |
Fund II | New Market Tax Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of tax credits on qualifying invested equity loans |  | 39.00% |  |  |  |  |  |  |  |  |  |
Transfer of tax credit transactions to investors exchange amount |  |  |  |  |  | $ 5,200,000 |  |  |  |  |  |
Redemption of loan expiration period |  |  | 7 years |  |  |  |  |  |  |  |  |
Fund II | Realized and Unrealized Holding Gains on Investments and Other | New Market Tax Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income recognized from tax credit transactions |  |  | $ 5,000,000.0 |  | $ 1,400,000 |  |  |  |  |  |  |
Fund II | City Point Project | New Market Tax Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income recognized from tax credit transactions |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |
Fund II | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  | 200,000,000.0 |  |  |  |  |  |  |  |
Maturity date |  |  | Aug. 11, 2022 |  |  |  |  |  |  |  |  |
Short-term Debt, Refinanced, Amount |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |
Loans Payable |  |  | $ 16,800,000 |  |  |  |  |  |  |  |  |
Fund II | LIBOR | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Basis Spread On Variable Rate1 |  |  | 2.75% |  |  |  |  |  |  |  |  |
Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 23,500,000 |  |  |  |  |  |  |  |  |
Scheduled principal payment |  |  | $ 8,600,000 |  |  |  |  |  |  |  |  |
Fund IV | Bridge facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
LIBOR plus |  |  | 2.50% |  |  |  | 2.00% |  |  |  |  |
LIBOR floor |  |  | 0.25% |  |  |  |  |  |  |  |  |
Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Holdback mortgage loan |  |  |  | 67,400,000 |  |  |  |  |  |  |  |
Fund loans repaid |  |  |  | 8,000,000.0 |  |  |  |  |  |  |  |
Fund IV | Mortgages One |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 11,600,000 |  |  |  |  |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 539,369,000 |  |  |  |  |  |  |  |  |
Core Portfolio | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on litigation settlement | $ 30,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Acquisition of noncontrolling interest | 15,900,000 |  |  |  |  |  |  |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio | Realized and Unrealized Holding Gains on Investments and Other |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportionate share | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Gain on debt extinguishment | $ 18,300,000 |  |  |  |  |  |  |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio | Acadia's OP Ownership |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest held by Operating Partnership | 78.22% |  |  |  |  |  |  |  |  |  |  |

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