Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 379,421,000	$ 383,861,000	$ 371,773,000	$ 371,561,000
Goodwill impairment loss	0	0	0
Amortization of intangible assets	60,000	1,795,000
Management and Success Fees [Member]
Goodwill And Intangible Assets [Line Items]
Amortization of intangible assets			$ 2,240,000
Financial Advisory Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	314,880,000	319,320,000
Asset Management Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 64,541,000	$ 64,541,000