Commitments and Contingencies - Schedule of Unfunded Commitments by Investment Types (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Long-term Purchase Commitment [Line Items]
Unfunded Commitment	$ 45,900
Unfunded Loan Commitment [Member]
Long-term Purchase Commitment [Line Items]
Unfunded Commitment	$ 45,032	$ 43,696
Unfunded Loan Commitment [Member] | Loan 1 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jan. 10, 2025	Jan. 10, 2024
Unfunded Commitment		$ 372
Unfunded Loan Commitment [Member] | Loan 2 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jul. 10, 2025	Jul. 10, 2025
Unfunded Commitment	$ 6,885	$ 6,885
Unfunded Loan Commitment [Member] | Loan 3 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Mar. 10, 2025	Mar. 10, 2025
Unfunded Commitment	$ 1,750	$ 1,750
Unfunded Loan Commitment [Member] | Loan 4 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date		May 10, 2025
Unfunded Commitment		$ 718
Unfunded Loan Commitment [Member] | Loan 5 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Aug. 05, 2025	Aug. 05, 2024
Unfunded Commitment		$ 1,607
Unfunded Loan Commitment [Member] | Loan 6 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jul. 05, 2025	Jul. 05, 2025
Unfunded Loan Commitment [Member] | Loan 7 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jul. 10, 2024	Mar. 10, 2024
Unfunded Commitment	$ 5,639	$ 7,862
Unfunded Loan Commitment [Member] | Loan 8 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Mar. 10, 2026	Mar. 10, 2026
Unfunded Commitment	$ 1,108	$ 1,302
Unfunded Loan Commitment [Member] | Loan 9 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Aug. 09, 2025	Aug. 09, 2024
Unfunded Loan Commitment [Member] | Loan 10 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Sep. 10, 2026	Sep. 10, 2026
Unfunded Commitment	$ 1,300	$ 1,300
Unfunded Loan Commitment [Member] | Loan 11 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Nov. 10, 2025	Nov. 10, 2025
Unfunded Commitment	$ 15,533	$ 21,900
Unfunded Loan Commitment [Member] | Loan 12 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	May 10, 2027
Unfunded Loan Commitment [Member] | Loan 13 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jun. 10, 2026
Unfunded Commitment	$ 9,937
Unfunded Loan Commitment [Member] | Loan 14 [Member]
Long-term Purchase Commitment [Line Items]
Expiration Date	Jul. 10, 2027
Unfunded Commitment	$ 2,880