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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | $ 72,414 | $ 78,112 | $ 228,035 | $ 225,143
Advisory Fees [Member] |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | 70,616 | 76,400 | 222,719 | 220,611
Other Income [Member] |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | $ 1,798 | $ 1,712 | $ 5,316 | $ 4,532

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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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