Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Schedule of Investments Valued Using NAV Per Share (Details)

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FAIR VALUE MEASUREMENTS - Schedule of Investments Valued Using NAV Per Share (Details) - Measured at NAV - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Accrued performance allocations $ 320,323 $ 381,993
Partnership interests 175,412 191,635
Unfunded Commitments 14,558 15,617
Company-sponsored open-end fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 29,054 46,530
Unfunded Commitments 0 0
Company-sponsored closed-end funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 131,696 131,188
Unfunded Commitments 7,275 7,662
Third-party closed-end funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 14,662 13,917
Unfunded Commitments $ 7,283 $ 7,955