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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 377,240,000	$ 379,421,000	$ 383,861,000	$ 371,773,000
Goodwill impairment loss	0	0	0
Amortization of intangible assets related to acquisitions	60,000	60,000	$ 1,795,000
Financial Advisory Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	312,699,000	314,880,000
Asset Management Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 64,541,000	$ 64,541,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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