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Notes Receivable, Net - Additional Information (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 20, 2022 | Nov. 02, 2020 | Nov. 01, 2020 | Apr. 01, 2020 | Jan. 14, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  | $ 159,638,000 |  | $ 102,100,000 |  |  |  |  |  |  |
Note receivable accrued interest |  |  | 21,148,000 |  | 13,917,000 |  |  |  |  |  |  |
Credit loss reserve |  |  | 5,752,000 |  | 1,218,000 |  |  |  |  |  |  |
Notes receivable, net |  |  | $ 153,886,000 |  | 100,882,000 |  |  |  |  |  | $ 114,943,000 | $ 111,775,000
Interest Rate |  |  | 9.00% |  |  |  |  |  |  |  |  |
Credit loss reserves |  |  | $ 153,886,000 |  | 100,882,000 |  |  |  |  |  |  |
OP Units In Settlement Of Note Receivable |  |  | 21,109 |  |  |  |  |  |  |  |  |
Settlement Amount Of Note Receivable In OP Units |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate |  |  | 153,886,000 |  | 100,882,000 |  |  |  |  |  | $ 114,943,000 | $ 111,775,000
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  | (114,000) |  | 46,440,000 |  |  |  |  |  |  |
Allowance for doubtful accounts receivable |  |  | $ 38,500,000 |  | $ 45,000,000.0 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  |  | 2027-12 |  |  |  |  |  |  |  |  |
Interest Rate | [1] |  | 12.00% |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  |  | 2020-04 |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 5.00% | [1] | 5.00% |  |  |  |  |  |  |
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 |  |  | $ 13,500,000 |  |  |  |  |  |  |  |  |
Notes receivable maturity date |  |  | Jun. 01, 2022 |  | Oct. 28, 2021 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 54,000,000.0 |  |
Interest Rate |  |  |  |  |  |  |  |  |  | 9.00% |  |
Fund II |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Note receivable accrued interest |  |  |  |  |  |  |  | $ 600,000 |  |  |  |
Notes receivable, net |  |  | 33,800,000 |  | 33,800,000 |  | $ 33,800,000 |  |  |  |  |
Mortgage Loans On Real Estate |  |  | $ 33,800,000 |  | 33,800,000 |  | $ 33,800,000 |  |  |  |  |
Fund III |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  |  | 2020-07 |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage by third party |  |  | 100.00% |  |  |  |  |  |  |  |  |
Additional credit loss reserve |  |  | $ 800,000 |  |  |  |  |  |  |  |  |
Notes receivable modified, subsequent payment default |  |  | 10,000,000.0 |  |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  | 4,500,000 |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable |  |  | 4,600,000 |  |  |  |  |  |  |  |  |
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 | [1] |  | 154,332,000 |  | 96,794,000 |  |  |  |  |  |  |
Credit loss reserves |  |  | 153,886,000 |  |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  | 4,600,000 |  | $ 600,000 |  |  |  |  |  |  |
Core Portfolio | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 42,000,000.0 |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate |  |  | 42,000,000.0 |  |  |  |  |  |  |  |  |
Core Portfolio | Silver Spring, Maryland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  |  |  |  | $ 16,000,000.0 |  |  |  |  |  |
Mortgage Loans On Real Estate |  |  |  |  |  | $ 16,000,000.0 |  |  |  |  |  |
Core Portfolio | Soho, New York [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  |  | 43,000,000.0 |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate |  |  | 43,000,000.0 |  |  |  |  |  |  |  |  |
Structured Financing |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Note receivable accrued interest |  |  | 8,800,000 |  |  |  |  |  |  |  |  |
Loans amortized cost |  |  | 0 |  |  |  |  |  |  |  |  |
Credit loss reserves |  |  | 37,900,000 |  |  |  |  |  |  |  |  |
Structured Financing | Non-Collateral Dependent Loans |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit loss reserve |  |  | 1,200 |  |  |  |  |  |  |  |  |
Note receivable accrued interest |  |  | 12,300,000 |  |  |  |  |  |  |  |  |
Loans amortized cost |  |  | $ 142,800,000 |  |  |  |  |  |  |  |  |
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% |  |  |
[1] | Includes one and two notes receivable from OP Unit holders, for $6.0 million and $6.5 million at December 31, 2021 and 2020, respectively.

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