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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Securities and other investments owned:    
Total securities and other investments owned $ 582,726 $ 992,455
Loans receivable, at fair value 229,199 532,419
Total assets measured at fair value 811,925 1,524,874
Securities sold not yet purchased:    
Total securities sold not yet purchased 4,765 8,601
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 5,304 5,835
Contingent consideration 29,303 27,986
Contingent consideration   27,985
Total liabilities measured at fair value 39,372 42,421
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 168,808 250,586
Loans receivable, at fair value 0 0
Total assets measured at fair value 168,808 250,586
Securities sold not yet purchased:    
Total securities sold not yet purchased 203 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 203 1,037
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 10,949 6,231
Loans receivable, at fair value 0 0
Total assets measured at fair value 10,949 6,231
Securities sold not yet purchased:    
Total securities sold not yet purchased 4,562 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 4,562 7,564
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 402,969 735,638
Loans receivable, at fair value 229,199 532,419
Total assets measured at fair value 632,168 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 5,304 5,835
Contingent consideration 29,303  
Contingent consideration   27,985
Total liabilities measured at fair value 34,607 33,820
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 540,490 930,179
Securities sold not yet purchased:    
Total securities sold not yet purchased 203 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 137,521 194,541
Securities sold not yet purchased:    
Total securities sold not yet purchased 203 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 402,969 735,638
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 36,915 59,287
Securities sold not yet purchased:    
Total securities sold not yet purchased 320 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 31,287 56,045
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Corporate bonds | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 5,628 3,242
Securities sold not yet purchased:    
Total securities sold not yet purchased 320 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 5,321 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 4,242 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 5,321 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 4,242 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