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Notes Receivable, Net - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Nov. 02, 2020 | Nov. 01, 2020 | Apr. 01, 2020 | Jan. 14, 2020
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Increase in allowance for credit loss |  | $ 100,000 |  |  |  |  |
Notes receivable |  | 102,100,000 | $ 102,100,000 |  |  |  |
Note receivable accrued interest |  | 15,481,000 | 13,917,000 |  |  |  |
Credit loss reserve |  | 690,000 | 650,000 |  |  |  |
Notes receivable, net |  | 101,410,000 | 101,450,000 |  |  |  |
Additional credit loss reserve |  |  | 300,000 |  |  |  |
Aggregate loans |  | 101,410,000 | 101,450,000 |  |  |  |
LUF Portfolio |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Note receivable accrued interest | $ 5,000,000.0 |  |  |  |  |  |
Interest Rate | 8.00% |  |  |  |  |  |
Percentage of mortgage loan collateralized | 50.00% |  |  |  |  |  |
Core Note |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable modified, subsequent payment default |  | 21,600,000 | 21,600,000 |  |  |  |
850 Third Avenue Brooklyn, NY |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  |  | $ 54,000,000.0
Interest Rate |  |  |  |  |  |  | 9.00%
Fund II |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  |  | $ 33,800,000 |  |  |
Note receivable accrued interest |  |  |  |  | $ 600,000 |  |
Notes receivable, net |  |  | 33,800,000 |  |  |  |
Fund III |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable modified, subsequent payment default |  | 10,000,000.0 |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Credit loss reserve |  |  | 400,000 |  |  |  |
Core Portfolio |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable |  | 96,794,000 | $ 96,794,000 |  |  |  |
Structured Financing |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Note receivable accrued interest |  | 8,800,000 |  |  |  |  |
Credit loss reserve |  | 0 |  |  |  |  |
Aggregate loans |  | 38,400,000 |  |  |  |  |
Structured Financing | Non-Collateral Dependent Loans |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Note receivable accrued interest |  | 6,700,000 |  |  |  |  |
Credit loss reserve |  | 700,000 |  |  |  |  |
Loans amortized cost |  | $ 79,200,000 |  |  |  |  |
Brandywine Portfolio | Core Portfolio |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  | $ 38,700,000 |
Note receivable accrued interest |  |  |  |  |  | $ 2,000,000.0 |
Equity method investment, ownership percentage by third party |  |  |  |  |  | 24.78% |

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