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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
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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

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