MIDDLE MARKET CREDIT FUND, LLC - Summary of Portfolio (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) loan financial_institution	Dec. 31, 2021 USD ($) financial_institution loan
Schedule of Investments [Line Items]
Fair value of loans on non-accrual status	$ 37,404	$ 76,551
Fair value of loans with PIK provisions	$ 194,694	$ 243,220
Credit Fund
Schedule of Investments [Line Items]
Weighted average yields of senior secured loans based on amortized cost	8.59%	6.04%
Weighted average yields of senior secured loans based on fair value	8.96%	6.09%
Number of portfolio companies in Credit Fund | financial_institution	44	45
Average amount per portfolio company	$ 21,431	$ 20,954
Number of loans on non-accrual status | loan	0	0
Fair value of loans on non-accrual status	$ 0	$ 0
Percentage of portfolio at floating interest rates	100.00%	100.00%
Percentage of portfolio at fixed interest rates	0.00%	0.00%
Fair value of loans with PIK provisions	$ 16,302	$ 0
Debt securities | Credit Fund
Schedule of Investments [Line Items]
Senior secured loans	$ 942,952	$ 942,930
Investments at fair value | Investment type concentration
Schedule of Investments [Line Items]
Concentration risk percentage	100.00%	100.00%
Investments at fair value | Investment type concentration | PIK loan
Schedule of Investments [Line Items]
Concentration risk percentage	10.00%	12.70%
Investments at fair value | Investment type concentration | PIK loan | Credit Fund
Schedule of Investments [Line Items]
Concentration risk percentage	1.80%	0.00%