Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 375,784	$ 379,421	$ 379,682	$ 383,861
Financial Advisory Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	311,243	314,880
Asset Management Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 64,541	$ 64,541