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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, 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	$ 79,175		$ 78,112		$ 75,775		$ 71,256		$ 65,651		$ 63,749		$ 57,312		$ 63,200		$ 304,318	$ 249,912	$ 266,528
UNITED STATES
Revenues																	179,016	142,074	170,827
JERSEY
Revenues																	114,623	103,061	88,547
IRELAND
Revenues																	10,679	4,412	4,714
CANADA
Revenues																	$ 0	$ 365	$ 2,440
[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.

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