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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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