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Investments - Additional Information (Detail)
$ in Millions
1 Months Ended
Aug. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
May 31, 2022
USD ($)
Feb. 28, 2022
USD ($)
Sep. 30, 2022
year
Investment
Dec. 31, 2021
Investment
Schedule of Investments [Line Items]            
Number of debt investments on non accrual status | Investment         0 0
Vektek Holdings, LLC            
Schedule of Investments [Line Items]            
Voting interest acquired (as a percent)     84.00%      
Total Senior Secured Notes            
Schedule of Investments [Line Items]            
Weighted average yield on debt investments (in percent)         15.20%  
Weighted average years to maturity (in years) | year         4.9  
Total Senior Secured Notes | Vektek Holdings, LLC            
Schedule of Investments [Line Items]            
Debt investment made through subsidiary     $ 24.4      
Equity | Vektek Holdings, LLC            
Schedule of Investments [Line Items]            
Purchase of equity investments     $ 56.9      
ATA Holding Company, LLC | Equity            
Schedule of Investments [Line Items]            
Purchase of equity investments       $ 1.1    
Clarion Safety Systems, LLC | Equity            
Schedule of Investments [Line Items]            
Additional equity investment   $ 4.0        
Blue Ridge ESOP Associates | Equity            
Schedule of Investments [Line Items]            
Additional equity investment $ 2.9