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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |
Total operating revenues | $ 72,830 | $ 63,874
Advisory Fees [Member] |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |
Total operating revenues | 71,616 | 62,950
Other Income [Member] |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |
Total operating revenues | $ 1,214 | $ 924

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- Definition Revenues from operations, excluding interest and dividend income. Includes revenues from the following sources: investment banking (underwriting and financial advisory), principal transactions (sales and trading, and investment gains and losses), commissions, asset management, and investment advisory and other services. + References No definition available. + Details
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- Definition Revenues Categorized As Revenues From Contracts With Customers And Other Sources Of Revenues [Line Items] + References No definition available. + Details
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- Details
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- Details
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