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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers and Other Sources of Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues From Contracts With Customers [Line Items]    
Total revenues from contracts with customers $ 534,572 $ 453,613
Principal transactions 116,078 112,849
Interest and dividend income 11,629 9,764
Other revenues 1,961 2,388
Total revenues 664,240 578,614
Commissions    
Revenues From Contracts With Customers [Line Items]    
Total revenues from contracts with customers 494,711 415,172
Data, network and post-trade    
Revenues From Contracts With Customers [Line Items]    
Total revenues from contracts with customers 32,500 30,903
Fees from related parties    
Revenues From Contracts With Customers [Line Items]    
Total revenues from contracts with customers 4,422 4,421
Other revenues    
Revenues From Contracts With Customers [Line Items]    
Total revenues from contracts with customers $ 2,939 $ 3,117