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Fair Value and Future Funding Commitments Related to These Investments (Parenthetical) (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Future Funding Commitments $ 14,214 $ 14,214
Global Debt Fund, LP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Proceeds from partial redemption of partnership interest 4,300  
European Non-Performing Loan Fund, LP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Funded commitment amount 35,800  
Unfunded Commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Future Funding Commitments 14,200  
Unfunded Commitments | European Non-Performing Loan Fund, LP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Future Funding Commitments $ 14,200