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Notes Receivable, Net - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Apr. 01, 2020 | Mar. 28, 2018 | Nov. 16, 2017 | May 01, 2017
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Notes receivable | $ 135,708,000 | $ 114,943,000 |  |  |  |
Note receivable accrued interest | 12,471,000 | 9,872,000 |  |  |  |
Notes receivable, net | 134,798,000 | 114,943,000 |  |  |  |
Additional credit loss reserve | 500,000 |  |  |  |  |
Credit loss reserves | 910,000 |  |  |  |  |
Credit loss reserves | 134,798,000 | 114,943,000 |  |  |  |
Core Portfolio |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Notes receivable | 96,794,000 | $ 76,467,000 |  |  |  |
Equity method investment, ownership percentage by third party |  | 24.78% |  | 14.11% | 38.89% |
Notes receivable modified, subsequent payment default |  | $ 20,800 |  |  |  |
Proceeds from notes receivable |  | 4,300,000 |  |  |  |
Notes receivable defer interest until maturity |  | 400,000 |  |  |  |
Structured Financing |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Note receivable accrued interest | 3,800,000 |  |  |  |  |
Loans amortized cost | 0 |  |  |  |  |
Credit loss reserves | 55,700,000 |  |  |  |  |
Structured Financing | Non-Collateral Dependent Loans |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Note receivable accrued interest | 8,700,000 |  |  |  |  |
Loans amortized cost | 92,500,000 |  |  |  |  |
Credit loss reserves | 900,000 |  |  |  |  |
Brandywine Portfolio | Core Portfolio |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Notes receivable | 38,700,000 | 38,700,000 |  |  |  |
Note receivable accrued interest | $ 2,000,000.0 |  |  |  |  |
Equity method investment, ownership percentage by third party | 24.78% |  | 24.78% |  |  |
Notes receivable, net |  |  |  |  |  | $ 153,400,000
ASU 2016-13 |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Credit loss reserve | $ 400,000 |  |  |  |  |
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% |  |  |  |  |
Pacesetter Park |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Interest Rate |  | 5.10% |  |  |  |
Note receivable exchanged for sale of real estate |  | $ 13,500,000 |  |  |  |
Fund II |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Note receivable accrued interest | $ 400,000 | 400,000 |  |  |  |
Fund III |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Note receivable accrued interest |  | 4,700,000 |  |  |  |
Notes receivable modified, subsequent payment default | $ 10,000,000.0 |  |  |  |  |
Fund IV |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Proceeds from notes receivable |  | 15,300,000 |  |  |  |
Note receivable accrued interest |  | $ 10,000,000.0 |  |  |  |

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