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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue From Contracts With Customers [Line Items] |  |  |
Revenue from contracts with customers | $ 1,761,232 | $ 1,604,620 |
Principal transactions | 321,923 | 313,053 | $ 317,856
Interest income | 18,319 | 14,404 | 14,557
Other revenues | 2,757 | 5,733 |
Total revenues | 2,104,231 | 1,937,810 | 1,750,951
Commissions [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Revenue from contracts with customers | 1,645,818 | 1,511,522 |
Data, Software And Post-Trade [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Revenue from contracts with customers | 73,166 | 65,185 |
Fees From Related Parties [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Revenue from contracts with customers | 29,442 | 24,076 |
Other Revenues [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Revenue from contracts with customers | 12,806 | 3,837 |
Total revenues | $ 136,490 | $ 113,235 | $ 98,712

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- Definition Amount of realized and unrealized gain (loss) resulting from the difference between acquisition price and selling price or fair value of trading assets and trading liabilities, and from the firm's direct investment activity, conducted separately from customer trading activities, including, but not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42567-110969 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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