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Revenues from Contracts with Customers - Summary of Geographic Distribution of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues | $ 67,059 | $ 64,640 | $ 58,126 | $ 63,874 | $ 68,907 | $ 67,718 | $ 66,293 | $ 65,485 | $ 253,699 | $ 268,403 | $ 274,116
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 142,074 | 170,827 |
JERSEY |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 106,848 | 90,422 |
IRELAND |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,412 | 4,714 |
CANADA |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 365 | $ 2,440 |

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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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