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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: $ 448,850 $ 385,663 $ 1,337,434 $ 1,181,122
Principal transactions 93,551 84,725 304,839 294,537
Interest and dividend income 16,944 10,150 43,853 28,836
Other revenues 1,766 2,156 4,360 4,146
Total revenues 561,111 482,694 1,690,486 1,508,641
Commissions        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 407,095 350,305 1,217,348 1,076,313
Data, network and post-trade        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 32,661 27,797 94,376 81,919
Fees from related parties        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 5,106 3,723 14,170 11,742
Other revenues        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 3,988 3,838 11,540 11,148
Total revenues $ 60,465 $ 47,664 $ 168,299 $ 137,791