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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, 2022	Mar. 31, 2021
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers:	$ 387,401	$ 464,889
Principal transactions	115,601	98,763
Interest and dividend income	2,435	3,038
Other revenues	1,027	886
Total revenues	506,464	567,576
Commissions
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers:	356,664	435,220
Data, software, and post-trade
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers:	24,127	21,986
Fees from related parties
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers:	3,317	3,785
Other revenues
Revenues From Contracts With Customers [Line Items]
Revenues from contracts with customers:	3,293	3,898
Total revenues	$ 34,199	$ 33,593

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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