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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Securities and other investments owned:    
Total securities and other investments owned $ 862,769 $ 992,455
Loans receivable, at fair value 452,496 532,419
Total assets measured at fair value 1,315,265 1,524,874
Securities sold not yet purchased:    
Total securities sold not yet purchased 6,423 8,601
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 5,601 5,835
Contingent consideration 29,322 27,986
Contingent consideration   27,985
Total liabilities measured at fair value 41,346 42,421
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 177,889 250,586
Loans receivable, at fair value 0 0
Total assets measured at fair value 177,889 250,586
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,645 1,037
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Contingent consideration 0  
Contingent consideration   0
Total liabilities measured at fair value 2,645 1,037
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 10,201 6,231
Loans receivable, at fair value 0 0
Total assets measured at fair value 10,201 6,231
Securities sold not yet purchased:    
Total securities sold not yet purchased 3,778 7,564
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Contingent consideration 0  
Contingent consideration   0
Total liabilities measured at fair value 3,778 7,564
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 674,679 735,638
Loans receivable, at fair value 452,496 532,419
Total assets measured at fair value 1,127,175 1,268,057
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 5,601 5,835
Contingent consideration 29,322  
Contingent consideration   27,985
Total liabilities measured at fair value 34,923 33,820
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 801,002 930,179
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,609 1,037
Equity securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 126,323 194,541
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,609 1,037
Equity securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Equity securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 674,679 735,638
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Corporate bonds    
Securities and other investments owned:    
Total securities and other investments owned 56,616 59,287
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,592 5,971
Corporate bonds | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 51,566 56,045
Securities sold not yet purchased:    
Total securities sold not yet purchased 36 0
Corporate bonds | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 5,050 3,242
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,556 5,971
Corporate bonds | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Other fixed income securities    
Securities and other investments owned:    
Total securities and other investments owned 5,151 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,222 1,593
Other fixed income securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Other fixed income securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 5,151 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,222 1,593
Other fixed income securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 0 $ 0