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Debt - Mortgage Payable - Additional Information (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) | Oct. 02, 2020 | Jun. 24, 2020 USD ($) | Nov. 09, 2017 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) property loan | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) property loan | Dec. 31, 2012 USD ($) | Jul. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | $ 101,450,000 |  | $ 114,943,000 |  |  | $ 111,775,000 | $ 160,991,000
Scheduled principal payment |  |  |  |  |  | 6,100,000 |  |  |  |  |  |
Amount of share failed to meet liquidity requirements. |  |  |  |  |  | 27,100,000 |  |  |  |  |  |
Mortgages failed to meet debt yield and debt service coverage ratio |  |  |  |  |  | 124,100,000 |  |  |  |  |  |
Amount of share failed to meet debt yield and debt service coverage ratio |  |  |  |  |  | 25,600,000 |  |  |  |  |  |
Gain on debt extinguishment |  |  |  |  |  | 18,339,000 |  |  |  |  |  |
Acquisition of noncontrolling interest |  |  |  |  |  | 588,000 |  |  |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 50,000,000.0 |  |  |  | $ 30,400,000 |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payment |  |  |  |  |  |  |  | 5,900,000 |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 258,900,000 |  |  |  |
Number of properties collateralized | property |  |  |  |  |  | 42 |  | 44 |  |  |  |
Mortgages | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 1.70% |  |  |  |
Mortgages | Subscription Line |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | $ 46,000,000.0 |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  | 7 |  |  |  |  |  |
Mortgages | Subscription Line 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | $ 51,300,000 |  |  |  |  |  |
Mortgages | Subscription Line 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | 40,000,000.0 |  |  |  |  |  |
Mortgages | Subscription Line 3 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | $ 88,000,000.0 |  |  |  |  |  |
Mortgages | Maturing from May 2019 to January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  |  |  | 3 |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 69,000,000.0 |  |  |  |
Mortgages | Maturing from May 2019 to January 2021 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 2.08% |  |  |  |
Mortgages | Maturing from April 2022 though December 2024. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 71,800,000 |  |  |  |
Mortgages | Maturing from April 2022 though December 2024. | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 1.86% |  |  |  |
Mortgages | Maturities Ranging from November 2019 through January 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  |  |  | 3 |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 135,900,000 |  |  |  |
Mortgages | Maturities Ranging from November 2019 through January 2020 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 3.65% |  |  |  |
Mortgages | Maturing Ranging from December 2020 though May 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 125,300,000 |  |  |  |
Mortgages | Maturing Ranging from December 2020 though May 2021 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 2.96% |  |  |  |
Mortgages | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | $ 283,600,000 |  |  |  |
Derivative weighted average interest rate |  |  |  |  |  |  |  | 1.78% |  |  |  |
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 |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  |  |  | 1 |  |  |  |
Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  |  |  | 3 |  |  |  |
Holdback mortgage loan |  |  |  |  |  | 23,800,000 |  |  |  |  |  |
Holdback mortgage loan outstanding |  |  |  |  |  | 18,900,000 |  |  |  |  |  |
Holdback mortgage loan drew an additional |  |  |  |  |  | 1,000,000.0 |  |  |  | $ 900,000 |  |
Repayments of debt |  |  |  |  |  |  |  | $ 38,200,000 |  |  |  |
Fund IV | Mortgages | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 2.35% |  |  |  |
Fund IV | Mortgages One | Colonie Plaza - Albany, NY |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 11,600,000 |  |  |  |  |  |
Fund IV | Mortgages Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 18,400,000 |  |  |  |
Fund III and Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Holdback mortgage loan |  |  |  |  |  | 103,400,000 |  |  |  |  |  |
Fund loans repaid |  |  |  |  |  | 11,500,000 |  |  |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 572,148,000 |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 26,300,000 |  |  |  |  |  |
Core Portfolio | Mortgages | Brandywine Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt default, amount |  |  |  |  |  |  |  | $ 26,300,000 |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Jul. 01, 2016 |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 6.00% |  |  |  |  |  |
Debt default interest |  |  |  |  |  | 5.00% |  |  |  |  |  |
Claim amount exclusive of accruing interest, default interest, late charges, and fees and costs |  |  |  | $ 33,000,000.0 |  |  |  |  |  |  |  |
Increase the alleged balance |  |  | $ 46,800,000 |  |  |  |  |  |  |  |  |
Default interest |  |  | 300,000 |  |  |  |  |  |  |  |  |
Attorneys fees |  |  | 200,000 |  |  |  |  |  |  |  |  |
Suspense funds |  |  | 1,500,000 |  |  |  | $ 1,300,000 |  |  |  |  |
Parties jointly and severally liable amount |  |  | 33,200,000 |  |  |  |  |  |  |  |  |
Default interest per diem |  |  | $ 8,017 |  |  |  |  |  |  |  |  |
Legal and other costs |  |  |  |  |  |  | 6,800,000 |  |  |  |  |
Proportionate share |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |
Cross appeal stay period |  | 90 days |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |
Fund V | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  |  |  | 5 |  |  |  |
Fund III | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 4,700,000 |  |  |  |
Fund III | Mortgages | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 0.50% |  |  |  |
Fund III | Mortgages One |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 9,800,000 |  |  |  |
Fund Mortgage And Fund I V |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Term loans failed to meet liquidity requirements |  |  |  |  |  | $ 115,200,000 |  |  |  |  |  |

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