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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
	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.

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No definition available.

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