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Debt - Mortgage and Other Notes Payable - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2023 USD ($) Mortgage | Jan. 31, 2024 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) Mortgage | Dec. 31, 2022 USD ($) Mortgage | Jun. 30, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Notes receivable, net |  |  |  | $ 124,949 | $ 123,903 |
Interest expense reduced | $ 700 |  |  |  |  |
Number of mortgage loans | Mortgage | 0 |  |  |  |  |
Maximum borrowing capacity |  |  |  | 900,000 |  |
Initial term for mortgage loan |  |  | 3 years |  |  |
Repayments of debt |  |  |  |  | 22,700 |
Scheduled principal payment |  |  |  | 7,700 |  |
Short-Term Debt, Refinanced, Amount |  |  |  | 111,400 |  |
Disposed of by sale |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  |  | 12,300 |
Discontinued Operations Disposed Of By Sale Under Fund Mortgage |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  |  | 97,600 |
Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes receivable, net |  |  |  | $ 32,200 | $ 42,400 |
Number of mortgage loans | Mortgage |  |  |  | 5 | 10 |
Mortgage Loan Principal Reduction Amount |  |  |  |  | $ 8,600 |
Maximum borrowing capacity |  |  |  |  | $ 42,200 |
Repayments of debt |  |  |  | $ 5,800 |  |
Maturity date |  |  |  |  | Dec. 29, 2023 |
Number of properties collateralized | Mortgage |  |  |  | 33 | 31 |
Mortgages | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Scheduled principal payment |  | $ 3,900 |  |  |  |
Mortgages | Subscription Line |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes receivable, net |  |  |  | $ 150,800 | $ 280,600 |
Mortgage Loan Principal Amount |  |  |  | $ 2,700 | 4,600 |
Mortgage Loan Interest Reserve |  |  |  |  | $ 4,200 |
Refinanced Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of mortgage loans | Mortgage |  |  |  | 4 |  |
SOFR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.65% |  | 2.61% |  | 2.56% |
Fund II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Single Mortgage Loan |  |  | $ 198,000 |  |  |
Proceeds from Sale of Mortgage Loans Held-for-sale |  |  | 132,300 |  |  |
Loans Payable |  |  | 26,000 |  |  |
Fund II | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 257,900 |  |  |
Maturity date |  |  | Jul. 10, 2027 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 4.00% |  |  |
Fund II | Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 50,000 |  |  |
Fund II | Unsecured Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | 40,000 |  |  |
Fund IV |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 17,000 |
Loan accrues default interest | 4.00% |  |  |  |  |
Fund IV | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage Loan Principal Reduction Amount |  |  |  | $ 3,000 |  |
Maximum borrowing capacity |  |  |  | $ 36,200 |  |
Maturity date |  |  |  | Mar. 31, 2025 |  |
Fund IV | 146 Geary Street, San Francisco, CA |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 19,300 |  |  |  |  |
Share value matured debt service coverage ratio | $ 4,500 |  |  |  |  |
Fund IV | 146 Geary Street, San Francisco, CA | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Impairment charges at the company's share |  |  |  | $ 3,700 |  |
Fund IV | 146 Geary Street, San Francisco, CA | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Impairment charges at the company's share |  |  |  | $ 900 |  |
Fund V |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of mortgage loans | Mortgage |  |  |  | 3 |  |
Maximum borrowing capacity |  |  |  | $ 29,200 |  |
Share value below debt service coverage ratio |  |  |  | 5,900 |  |
Fund V | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Share value below debt service coverage ratio |  |  |  | 25,500 |  |
Short-Term Debt, Refinanced, Amount |  |  |  | 127,100 |  |
Core Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes receivable, net |  |  |  |  | 13,500 | $ 16,000
Derivative, notional amount |  |  |  | $ 856,000 |  |
Short-Term Debt, Refinanced, Amount |  |  | $ 25,400 |  |  |
Core Portfolio | Disposed of by sale |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Scheduled principal payment |  |  |  |  | $ 7,500 |

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