Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Other Sources of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers	$ 1,812,612	$ 1,607,379	$ 1,406,692
Principal transactions	389,429	368,100	365,507
Interest and dividend income	56,223	45,422	21,007
Other revenues	4,554	4,500	2,096
Total revenues	2,262,818	2,025,401	1,795,302
Commissions
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers	1,648,817	1,464,524	1,281,294
Data, network and post-trade
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers	126,963	111,470	96,389
Fees from related parties
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers	20,728	15,968	14,734
Other revenues
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers	$ 16,104	$ 15,417	$ 14,275