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Formation and Business Purpose (Details) - USD ($)
$ in Thousands
 9 Months Ended 148 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Net proceeds from offerings of common stock $ 6,625 $ 40,006 $ 952,242
Minimum      
Summary of Investment Holdings [Line Items]      
EBITDA as defined for middle market business 10,000    
Maximum      
Summary of Investment Holdings [Line Items]      
EBITDA as defined for middle market business 200,000    
New Mountain Capital      
Summary of Investment Holdings [Line Items]      
Assets under management $ 45,000,000   $ 45,000,000