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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: $ 385,663 $ 331,433 $ 1,181,122 $ 1,057,901
Principal transactions 84,725 79,568 294,537 283,338
Interest and dividend income 10,150 4,110 28,836 15,506
Other revenues 2,156 1,456 4,146 2,042
Total revenues 482,694 416,567 1,508,641 1,358,787
Commissions        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 350,305 299,430 1,076,313 965,636
Data, network and post-trade        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 27,797 23,808 81,919 71,326
Fees from related parties        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 3,723 3,896 11,742 10,838
Other revenues        
Revenues From Contracts With Customers [Line Items]        
Revenues from contracts with customers: 3,838 4,299 11,148 10,101
Total revenues $ 47,664 $ 37,569 $ 137,791 $ 109,813