Commitments and Contingencies - Summary of Outstanding Commitments to Fund Investments in Current Portfolio Companies (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	$ 8,834	$ 6,562
Accordion Partners LLC [Member] \| Senior Secured Loan One [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	1,449	1,632
AMCP PET HOLDINGS, INC. [Member] \| Senior Secured Loan Two [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	0	175
Beta Plus Technologies R/C [Member] \| Senior Secured Loan Three [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	305	473
Great Lakes II Funding LLC [Member] \| Equity/Other [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	16	11
Green Park M-1 Series [Member] \| Equity/Other [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	0	366
Morae Global Inc [Member] \| Senior Secured Loan Four [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	292	292
Newbury Franklin Industrials LLC [Member] \| Senior Secured Loan Five [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	789	0
PhyNet Dermatology LLC [Member] \| Senior Secured Loan Six [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	1,713	1,713
Princeton Medspa Partners LLC [Member] \| Senior Secured Loan Seven [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	1,203	0
Riddell, Inc [Member] \| Senior Secured Loan Eight [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	364	0
SePRO Corporation [Member] \| Senior Secured Loan Nine [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	505	0
SeQuel Response LLC [Member] \| Senior Secured Loan Ten [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	100	0
Spark Buyer LLC [Member] \| Senior Secured Loan Eleven [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	1,429	0
TA/WEG Holdings, LLC [Member] \| Senior Secured Loan Twelve [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	111	0
Tactical Air Support, Inc [Member] \| Senior Secured Loan Thirteen [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	0	571
Tank Holding Corp Revolver [Member] \| Senior Secured Loan Fourteen [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	113	249
VBC Spine Opco LLC [Member] \| Senior Secured Loan Fifteen [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Portfolio Company Commitments	$ 445	$ 1,080

BC Partners Lending Corp 10-K