Loan Receivables Held for Investment - Schedule Of Company's Investments In Loan Receivables Held For Investment (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Jun. 30, 2024
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Total Commitment	$ 894,867	$ 723,733
Loan Balance	849,835	680,037
Carrying Value	$ 845,913	$ 675,211	$ 845,913
Loan 1 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Dec. 17, 2021	Dec. 17, 2021
Total Commitment	$ 29,276	$ 41,648
Loan Balance	$ 29,276	$ 41,276
Contractual Interest Rate	OFR + 3.06	SOFR+3.06
Loans receivable basis spread on variable rate	3.06%	3.06%
Carrying Value		$ 41,270	$ 29,276
Interest rate		8.42%	8.17%
Maturity Date	Jan. 10, 2025	Jan. 10, 2024
Payment Terms	Interest only	Interest only
Loan 1 [Member] | Multifamily [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Multifamily	Multifamily
Loan 2 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Dec. 28, 2021	Dec. 28, 2021
Total Commitment	$ 48,325	$ 48,325
Loan Balance	$ 41,440	$ 41,440
Contractual Interest Rate	SOFR + 3.61	SOFR+3.61
Loans receivable basis spread on variable rate	3.61%	3.61%
Carrying Value		$ 41,224	$ 41,329
Interest rate		8.97%	8.72%
Maturity Date	Jul. 10, 2025	Jul. 10, 2025
Payment Terms	Interest only	Interest only
Loan 2 [Member] | Industrial Property [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Industrial	Industrial
Loan 3 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Feb. 14, 2022	Feb. 14, 2022
Total Commitment	$ 42,750	$ 42,750
Loan Balance	$ 41,000	$ 41,000
Contractual Interest Rate	SOFR + 6.50	SOFR+6.50
Loans receivable basis spread on variable rate	6.50%	6.50%
Carrying Value		$ 40,822	$ 40,933
Interest rate		11.86%	11.61%
Maturity Date	Mar. 10, 2025	Mar. 10, 2025
Payment Terms	Interest only	Interest only
Loan 3 [Member] | Hospitality [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Hospitality	Hospitality
Loan 4 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type		Loan origination
Origination Date		Apr. 14, 2022
Total Commitment		$ 41,500
Loan Balance		$ 40,782
Contractual Interest Rate		SOFR+3.30
Loans receivable basis spread on variable rate		3.30%
Carrying Value		$ 40,591
Interest rate		8.66%
Maturity Date		May 10, 2025
Payment Terms		Interest only
Loan 4 [Member] | Multifamily [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type		Multifamily
Loan 5 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Jul. 14, 2022	Jul. 14, 2022
Total Commitment	$ 55,935	$ 55,935
Loan Balance	$ 55,935	$ 54,328
Contractual Interest Rate	SOFR + 4.25	SOFR+4.25
Loans receivable basis spread on variable rate	4.25%	4.25%
Carrying Value		$ 54,157	$ 55,935
Interest rate		9.60%	9.42%
Maturity Date	Aug. 05, 2025	Aug. 05, 2024
Payment Terms	Interest only	Interest only
Loan 5 [Member] | Office [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Office	Office
Loan 6 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Purchase	Purchase
Origination Date	Jul. 07, 2022	Jul. 07, 2022
Total Commitment	$ 27,748	$ 37,748
Loan Balance	$ 27,748	$ 37,748
Contractual Interest Rate	SOFR + 4.75	SOFR+4.75
Loans receivable basis spread on variable rate	4.75%	4.75%
Carrying Value		$ 37,583	$ 27,692
Interest rate		10.11%	9.85%
Maturity Date	Jul. 05, 2025	Jul. 05, 2025
Payment Terms	Interest only	Interest only
Loan 6 [Member] | Hospitality [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Hospitality	Hospitality
Loan 7 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Purchase	Purchase
Origination Date	Nov. 22, 2022	Nov. 22, 2022
Total Commitment	$ 25,224	$ 25,224
Loan Balance	$ 19,585	$ 17,362
Contractual Interest Rate	SOFR + 9.05	SOFR+9.05
Loans receivable basis spread on variable rate	9.05%	9.05%
Carrying Value		$ 17,325	$ 19,585
Interest rate		14.41%	14.16%
Maturity Date	Jul. 10, 2024	Mar. 10, 2024
Payment Terms	Interest only	Interest only
Loan 7 [Member] | Mixed Use [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Mixed Use	Mixed Use
Loan 8 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Mar. 10, 2023	Mar. 10, 2023
Total Commitment	$ 35,800	$ 35,800
Loan Balance	$ 34,692	$ 34,498
Contractual Interest Rate	SOFR + 3.50	SOFR+3.50
Loans receivable basis spread on variable rate	3.50%	3.50%
Carrying Value		$ 34,227	$ 34,509
Interest rate		8.86%	8.61%
Maturity Date	Mar. 10, 2026	Mar. 10, 2026
Payment Terms	Interest only	Interest only
Loan 8 [Member] | Industrial Property [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Industrial	Industrial
Loan 9 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Purchase	Purchase
Origination Date	Mar. 31, 2023	Mar. 31, 2023
Total Commitment	$ 157,509	$ 162,503
Loan Balance	$ 157,509	$ 162,503
Contractual Interest Rate	OFR + 2.25	SOFR+2.25
Loans receivable basis spread on variable rate	2.25%	2.25%
Carrying Value		$ 161,044	$ 157,509
Interest rate		7.61%	7.35%
Maturity Date	Aug. 09, 2025	Aug. 09, 2024
Payment Terms	Interest only	Interest only
Loan 9 [Member] | Student Housing [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Student Housing	Student Housing
Loan 10 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Aug. 31, 2023	Aug. 31, 2023
Total Commitment	$ 86,300	$ 86,300
Loan Balance	$ 85,000	$ 85,000
Contractual Interest Rate	SOFR + 2.90	SOFR+2.90
Loans receivable basis spread on variable rate	2.90%	2.90%
Carrying Value		$ 84,222	$ 84,422
Interest rate		8.26%	8.01%
Maturity Date	Sep. 10, 2026	Sep. 10, 2026
Payment Terms	Interest only	Interest only
Loan 10 [Member] | Multifamily [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Multifamily	Multifamily
Loan 11 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination	Loan origination
Origination Date	Nov. 02, 2023	Nov. 02, 2023
Total Commitment	$ 146,000	$ 146,000
Loan Balance	$ 130,467	$ 124,100
Contractual Interest Rate	SOFR + 5.50	SOFR+5.50
Loans receivable basis spread on variable rate	5.50%	5.50%
Carrying Value		$ 122,746	$ 129,628
Interest rate		10.86%	10.61%
Maturity Date	Nov. 10, 2025	Nov. 10, 2025
Payment Terms	Interest only	Interest only
Loan 11 [Member] | Mixed Use [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Mixed Use	Mixed Use
Loan 12 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination
Origination Date	May 07, 2024
Total Commitment	$ 30,000
Loan Balance	$ 30,000
Contractual Interest Rate	SOFR + 4.00
Loans receivable basis spread on variable rate	4.00%
Carrying Value			$ 29,735
Interest rate			9.11%
Maturity Date	May 10, 2027
Payment Terms	Interest only
Loan 12 [Member] | Hospitality [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Hospitality
Loan 13 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination
Origination Date	May 16, 2024
Total Commitment	$ 110,000
Loan Balance	$ 100,063
Contractual Interest Rate	SOFR + 4.25
Loans receivable basis spread on variable rate	4.25%
Carrying Value			$ 99,149
Interest rate			9.36%
Maturity Date	Jun. 10, 2026
Payment Terms	Interest only
Loan 13 [Member] | Mixed Use [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Mixed Use
Loan 14 [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Investment Type	Loan origination
Origination Date	Jun. 11, 2024
Total Commitment	$ 100,000
Loan Balance	$ 97,120
Contractual Interest Rate	SOFR + 3.75
Loans receivable basis spread on variable rate	3.75%
Carrying Value			$ 96,211
Interest rate			8.86%
Maturity Date	Jul. 10, 2027
Payment Terms	Interest only
Loan 14 [Member] | Multifamily [Member]
Disclosure In Tabular Form Of Loans Receivable Held For Investment [Line Items]
Loan Type	Multifamily