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Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2021 | Apr. 08, 2021 | Apr. 06, 2021 | Apr. 02, 2021 | Mar. 31, 2021 | Apr. 20, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from the disposition of properties, net |  |  |  |  | $ 15,703 |  |
Mortgage loan |  |  |  |  | $ 101,410 |  | $ 101,450
Subsequent Event | MCB Venture |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Notes receivable issued |  |  |  |  |  | $ 16,000 |
Subsequent Event | Fund V |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Investment maturity date |  | Aug. 25, 2022 |  |  |  |  |
Subsequent Event | Airport Mall, Shaws North Windham, Shaws Waterville and Wells Plaza Properties | Fund IV | Disposed of by sale |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from the disposition of properties, net |  |  |  | $ 40,400 |  |  |
Subsequent Event | Lincoln Place Property | Fund IV | Mortgages |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage loan |  |  | $ 23,100 |  |  |  |
Debt instrument, maturity date |  |  | Mar. 13, 2022 |  |  |  |
Subsequent Event | Unconsolidated Property, 650 Bald Hill Road | Fund IV | Mortgages |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Mortgage loan | $ 18,500 |  |  |  |  |  |
Debt instrument, maturity date | Jun. 27, 2021 |  |  |  |  |  |

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