v3.26.1
SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Schedule of equity method investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]        
Equity attributable to investee $ (171,533)   $ (488,175)  
Noncontrolling interest 1,575   0  
Revenues 967,599   746,421  
Loss from continuing operations 239,444   (922,409)  
Cost of revenue and expenses 892,018   1,243,968  
Net income (loss) attributable to investees $ 307,415   $ (764,274)  
FRG        
Schedule of Equity Method Investments [Line Items]        
Current assets       $ 871,102
Noncurrent assets       2,889,334
Current liabilities       569,281
Noncurrent liabilities       2,680,178
Revenues       3,131,138
Cost of revenues       1,991,258
FRG | Investee        
Schedule of Equity Method Investments [Line Items]        
Equity attributable to investee       510,977
Net income (loss) attributable to investees       (391,385)
B&W        
Schedule of Equity Method Investments [Line Items]        
Current assets   $ 479,733   530,223
Noncurrent assets   178,151   274,410
Current liabilities   400,985   297,928
Noncurrent liabilities   489,106   709,823
Noncontrolling interest   0   576
Revenues   540,535   878,224
Cost of revenues   395,857   721,112
Loss from continuing operations   (87,475)   (55,910)
Net income (loss) attributable to investees   (108,410)   (59,482)
B&W | Investee        
Schedule of Equity Method Investments [Line Items]        
Equity attributable to investee   (232,207)   (203,694)
Net income (loss) attributable to investees   (108,472)   (67,019)
Other Equity Investments        
Schedule of Equity Method Investments [Line Items]        
Current assets   23,491   215,927
Noncurrent assets   140,981   572,628
Current liabilities   22,988   86,672
Noncurrent liabilities   66,509   105,711
Revenues   62,097   428,564
Cost of revenue and expenses   11,069   320,364
Other Equity Investments | Investee        
Schedule of Equity Method Investments [Line Items]        
Equity attributable to investee   74,975   596,172
Net income (loss) attributable to investees   $ 7,740   (43,372)
Synchronoss        
Schedule of Equity Method Investments [Line Items]        
Current assets       77,940
Noncurrent assets       221,758
Current liabilities       41,553
Noncurrent liabilities       210,342
Revenues       170,789
Cost of revenues       68,365
Synchronoss | Investee        
Schedule of Equity Method Investments [Line Items]        
Equity attributable to investee       47,803
Net income (loss) attributable to investees       $ (38,283)