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v3.21.1

Debt - Mortgages and Other Notes Payable - Additional Information (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2021 | Oct. 30, 2020 USD ($) | Jan. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) property loan | Dec. 31, 2020 USD ($) property | Dec. 31, 2020 USD ($) property loan | Jul. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  | $ 101,410 | $ 101,450 | $ 101,450 |  |
Scheduled principal payment |  |  |  |  |  | $ 6,100 |  |
Amount of share failed to meet liquidity requirements |  |  |  | $ 8,700 |  |  |  |
Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  | 3 |  |  |  |
Number of properties collateralized | property |  |  |  | 41 | 42 | 42 |  |
Mortgages | Subscription Line |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  |  |  | 7 |  |
Notes receivable, net |  |  |  | $ 37,700 | $ 46,000 | $ 46,000 |  |
Mortgages | Subscription Line 1 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  | 23,100 | 51,300 | 51,300 |  |
Mortgages | Subscription Line 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  | 40,000 | 40,000 |  |
Mortgages | Subscription Line 3 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  | 88,000 | 88,000 |  |
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 | 2.00% |  |  | 2.50% |  |  |  |
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 | 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 |  |  |  | $ 565,158 |  |  |  |
Core Portfolio | Sixty Orange Street | Disposed of by sale |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 6,700 |  |  |  |
Scheduled principal payment |  |  |  | $ 2,000 |  |  |  |
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 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 |  |
Fund III | Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term loans failed to meet liquidity requirements |  |  |  | $ 35,600 |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 50,000 | $ 50,000 | $ 30,400 |
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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