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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, 2023
Dec. 31, 2022
Assets:    
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries $ 0 $ 174,437
Securities and other investments owned:    
Total securities and other investments owned 942,928 965,096
Loans receivable, at fair value 683,827 701,652
Total assets measured at fair value 1,626,755 1,841,185
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,686 5,897
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 4,352 4,648
Warrant liabilities   173
Contingent consideration 27,724 31,046
Total liabilities measured at fair value 34,762 41,764
Quoted prices in active markets for identical assets (Level 1)    
Assets:    
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries   174,437
Securities and other investments owned:    
Total securities and other investments owned 544,809 584,136
Loans receivable, at fair value 0 0
Total assets measured at fair value 544,809 758,573
Securities sold not yet purchased:    
Total securities sold not yet purchased 951 4,466
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Warrant liabilities   173
Contingent consideration 0 0
Total liabilities measured at fair value 951 4,639
Other observable inputs (Level 2)    
Assets:    
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries   0
Securities and other investments owned:    
Total securities and other investments owned 10,989 12,495
Loans receivable, at fair value 0 0
Total assets measured at fair value 10,989 12,495
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,735 1,431
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Warrant liabilities   0
Contingent consideration 0 0
Total liabilities measured at fair value 1,735 1,431
Significant unobservable inputs (Level 3)    
Assets:    
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries   0
Securities and other investments owned:    
Total securities and other investments owned 387,130 368,465
Loans receivable, at fair value 683,827 701,652
Total assets measured at fair value 1,070,957 1,070,117
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 4,352 4,648
Warrant liabilities   0
Contingent consideration 27,724 31,046
Total liabilities measured at fair value 32,076 35,694
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 874,858 952,601
Securities sold not yet purchased:    
Total securities sold not yet purchased 951 4,466
Equity securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 487,728 584,136
Securities sold not yet purchased:    
Total securities sold not yet purchased 951 4,466
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 387,130 368,465
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 62,977 8,539
Securities sold not yet purchased:    
Total securities sold not yet purchased 703 1,162
Corporate bonds | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 57,081 0
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 5,896 8,539
Securities sold not yet purchased:    
Total securities sold not yet purchased 703 1,162
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 5,093 3,956
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,032 269
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 5,093 3,956
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,032 269
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