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FAIR VALUE - Investments Using NAV per Share (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Consolidated Funds     
FAIR VALUE    
Investments (held at fair value) $ 1,486,217,000 $ 1,392,169,000
Investments Measured at NAV | Consolidated Funds     
FAIR VALUE    
Investments (held at fair value) 1,486,217,000 1,023,514,000
Investments Measured at NAV | Non-core investments    
FAIR VALUE    
Investments (held at fair value) 3,600,000 1,400,000
Unfunded commitments 0 0
Investments Measured at NAV | Non-core investments | Consolidated Funds     
FAIR VALUE    
Investments (held at fair value) 1,486,217,000 1,023,514,000
Unfunded commitments $ 830,746,000 $ 869,016,000