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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 | [1] | Sep. 30, 2021 | [1] | Jun. 30, 2021 | [1] | Mar. 31, 2021 | [1] | Dec. 31, 2020 | [1] | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1] | Mar. 31, 2020 | [1] | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 79,175 | $ 78,112 | $ 75,775 | $ 71,256 | $ 65,651 | $ 63,749 | $ 57,312 | $ 63,200 | $ 304,318 | $ 249,912 | $ 266,528
Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 298,052 | 246,395 | 263,777
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 6,266 | $ 3,517 | $ 2,751
[1] | Advisory fees previously reported have been revised due to an immaterial error correction. These revisions had no effect on previously reported net income. See Note 2 for additional information.

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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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