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Formation and Business Purpose (Details) - USD ($)
$ in Thousands
 3 Months Ended 154 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Net proceeds from offerings of common stock $ 47,919 $ 0 $ 1,014,778
Summary of Investment Holdings [Line Items]      
Net proceeds from offerings of common stock 47,919 $ 0 1,014,778
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 $ 50,000,000   $ 50,000,000