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
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Accrued performance allocations $ 377,474 $ 554,723
Partnership interests 192,211 77,087
Unfunded Commitments 19,590 30,087
Company-sponsored open-end fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 49,533 26,169
Unfunded Commitments 0 20,755
Company-sponsored closed-end funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 133,194 39,120
Unfunded Commitments 18,997 3,763
Third-party closed-end funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Partnership interests 9,484 11,798
Unfunded Commitments $ 593 $ 5,569