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Agreements and Transactions with Related Parties - Other Related Party (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) entity shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) entity shares | Sep. 30, 2023 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) loan property | Dec. 31, 2023 USD ($)
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Due from related party | $ 96,823 |  | $ 96,823 |  |  |  |  | $ 64,421
Due to related party | 25,474 |  | 25,474 |  |  |  |  | $ 13,799
Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Reimbursement for flights chartered by the company's executives | $ 100 | $ 200 | $ 400 | $ 600 |  |  |  |
Other Related Party Transactions | Related Party | ACM Acquisition | ACM |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Number of shares held by related party (in shares) | shares | 2,535,870 |  | 2,535,870 |  |  |  |  |
Number of operating units held by related party (in shares) | shares |  |  | 10,597,566 |  |  |  |  |
Aggregate percentage of voting power held by related party | 6.40% |  | 6.40% |  |  |  |  |
Other Related Party Transactions | Related Party | Maturity Date Of June 2021 | Bridge loans |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Number of bridge loans originated | loan |  |  |  |  |  |  | 12 |
Principal amount |  |  |  |  |  |  | $ 280,500 |
Number of multifamily properties renovated | property |  |  |  |  |  |  | 72 |
Other Related Party Transactions | Related Party | Maturity date of March 2030 | Private Label | Lexford Portfolio |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Fixed rate of interest |  |  |  |  | 3.30% |  |  |
Other Related Party Transactions | Related Party | Maturity date December 2029 | Bridge loans | Lexford Portfolio |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Maximum exposure under guaranty | $ 500,000 |  | $ 500,000 |  |  |  |  |
Other Related Party Transactions | Chief executive officer |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Percentage of our former manager's outstanding membership interest of related party in another related party | 35.00% |  | 35.00% |  |  |  |  |
Other Related Party Transactions | Chief executive officer | Minimum |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Ownership percentage limit of our common stock under company charter | 5.00% |  | 5.00% |  |  |  |  |
Other Related Party Transactions | Director |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Number of Kaufman entities | entity | 2 |  | 2 |  |  |  |  |
Lexford Portfolio |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Distribution received | $ 4,900 |  | $ 9,000 | 7,200 |  |  |  |
Lexford Portfolio | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Management fee, percentage of gross revenues of underlying properties |  |  | 4.75% |  |  |  |  |
Lexford Portfolio | Other Related Party Transactions | Related Party | Maturity Date Of June 2021 | Bridge loans |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Base spread, percentage |  |  |  |  |  |  | 4.00% |
Payoffs and partial paydowns of principal |  |  |  |  |  | $ 250,000 |  |
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners |  |  |  |  |  |  | $ 50,000 |
Distribution received | $ 4,900 |  | $ 9,000 | $ 7,200 |  |  |  |
Lexford Portfolio | Other Related Party Transactions | Related Party | Maturity date of March 2030 | Private Label |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 34,600 |  |  |

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