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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | $ 67,718 | $ 72,570 | $ 199,496 | $ 206,249
Advisory Fees [Member] |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | 67,006 | 71,679 | 197,473 | 203,913
Other Income [Member] |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |
Total operating revenues | $ 712 | $ 891 | $ 2,023 | $ 2,336

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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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