FAIR VALUE - Schedule of Investments and Other Financial Instruments of Consolidated Funds by Fair-Value Hierarchy Level (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	$ 33,349	$ 17,741
Derivative liabilities	(13,385)	(30,750)
Consolidated Funds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	4,946,862	5,143,677
Derivative assets, at fair value	33,349	9,133
Derivative liabilities	(13,385)	(22,230)
Consolidated Funds | Options and futures
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	(4,853)	571
Consolidated Funds | Level III
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	4,062,983	3,603,942
Consolidated Funds | Fair Value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	4,946,862	5,143,677
Derivative assets, at fair value	33,349	9,133
Total assets	4,980,211	5,152,810
Derivative liabilities	(13,385)	(22,230)
Total liabilities	(13,385)	(22,230)
Consolidated Funds | Fair Value, Measurements, Recurring | Foreign-currency forward contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	17,578	475
Derivative liabilities	(8,513)	(21,659)
Consolidated Funds | Fair Value, Measurements, Recurring | Swaps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	15,771	8,658
Derivative liabilities	(19)	0
Consolidated Funds | Fair Value, Measurements, Recurring | Options and futures
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	(4,853)	(571)
Consolidated Funds | Fair Value, Measurements, Recurring | Corporate debt – bank debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	2,218,233	2,363,503
Consolidated Funds | Fair Value, Measurements, Recurring | Corporate debt – all other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	465,474	959,055
Consolidated Funds | Fair Value, Measurements, Recurring | Equities – Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	1,448,983	1,044,201
Consolidated Funds | Fair Value, Measurements, Recurring | Equities – preferred stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	607,991	601,565
Consolidated Funds | Fair Value, Measurements, Recurring | Real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	206,181	175,353
Consolidated Funds | Fair Value, Measurements, Recurring | Level I
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	224,520	167,578
Derivative assets, at fair value	0	8,658
Total assets	224,520	176,236
Derivative liabilities	0	(571)
Total liabilities	0	(571)
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Foreign-currency forward contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	0	0
Derivative liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Swaps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	0	8,658
Derivative liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Options and futures
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	0	(571)
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Corporate debt – bank debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Corporate debt – all other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Equities – Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	222,670	165,649
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Equities – preferred stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	1,850	1,929
Consolidated Funds | Fair Value, Measurements, Recurring | Level I | Real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level II
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	675,130	1,372,157
Derivative assets, at fair value	17,578	475
Total assets	692,708	1,372,632
Derivative liabilities	(13,385)	(21,659)
Total liabilities	(13,385)	(21,659)
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Foreign-currency forward contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	17,578	475
Derivative liabilities	(8,513)	(21,659)
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Swaps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	0	0
Derivative liabilities	(19)	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Options and futures
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	(4,853)	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Corporate debt – bank debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	281,918	641,615
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Corporate debt – all other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	353,922	698,763
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Equities – Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	39,290	31,779
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Equities – preferred stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level II | Real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level III
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	4,047,212	3,603,942
Derivative assets, at fair value	15,771	0
Total assets	4,062,983	3,603,942
Derivative liabilities	0	0
Total liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Foreign-currency forward contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	0	0
Derivative liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Swaps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, at fair value	15,771	0
Derivative liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Options and futures
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	0	0
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Corporate debt – bank debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	1,936,315	1,721,888
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Corporate debt – all other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	111,552	260,292
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Equities – Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	1,187,023	846,773
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Equities – preferred stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	606,141	599,636
Consolidated Funds | Fair Value, Measurements, Recurring | Level III | Real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	$ 206,181	$ 175,353