Loan Receivables Held for Investment - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended			9 Months Ended
	Aug. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Sep. 30, 2024	Sep. 30, 2023
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Repayments of Long-Term Lines of Credit				$ 116,000	$ 141,100
Morgan Stanley Mortgage Capital Holdings [Member] | Loan Repurchase Agreement April Two Thousand And Twenty Two [Member] | Mortgage Stanley [Member] | AB CRE PDF Member One LLC [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Line of Credit Facility, Expiration Date			Apr. 27, 2026
Loan 5 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Line of Credit Facility, Expiration Date	Aug. 05, 2025
Loan 9 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Line of Credit Facility, Expiration Date		Aug. 09, 2025