v3.26.1
SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 18, 2023
USD ($)
shares
Aug. 21, 2023
USD ($)
Mar. 31, 2024
Dec. 31, 2025
USD ($)
investment
Dec. 31, 2024
USD ($)
investment
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Partnership investment interests       $ 1,833 $ 15,867
Equity securities, FV-NI, unrealized gain (loss)       $ 36,107 (48,994)
Variable interest, ownership percentage     10.00%    
Related Party          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Equity securities, FV-NI, unrealized loss         $ 287,043
FRG Investment          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Percentage Ownership   31.00%      
FRG Investment | Related Party          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Percentage Ownership   31.00%      
B&W          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Percentage Ownership       25.00% 29.10%
Fair value       $ 174,011 $ 45,012
Synchronoss          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Fair value       3,503 7,200
FRG          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Payments to acquire equity method investments   $ 281,144      
FRG | Related Party          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Payments to acquire equity method investments   281,144      
Other Equity Investments          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Fair value       $ 19,835 $ 29,562
Equity method investment, number of private companies | investment       3 5
Freedom VCM Holdings, LLC          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Payments to acquire equity method investments   216,500      
Take-private transaction, vote or disposal, amount of shares   64,644      
Debt instrument, repurchase amount   20,911      
Freedom VCM Holdings, LLC | Conn’s          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Sale of stock, percentage of ownership after transaction 49.99%        
Gross proceeds $ 69,900        
Freedom VCM Holdings, LLC | Preferred Stock | Conn’s          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Consummated units (in shares) | shares 1,000,000        
Freedom VCM Holdings, LLC | Nonvoting Common Stock | Conn’s          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Preferred stock, convertible, shares issuable (in shares) | shares 24,540,295        
Freedom VCM Receivables, Inc. | Related Party          
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]          
Gain (loss) on sale of financing receivable   (78)      
Payments to acquire finance receivables   $ 58,872      
Effective Interest Rate   19.74%