Segment Information - Segment's Contribution with Respect to Net Revenue, Operating Expenses, Operating Income (Loss) and Total Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net Revenue	$ 2,773,571	$ 3,193,048	$ 2,566,138
Operating Expenses	2,256,723	2,469,200	2,063,997
Operating Income (Loss)	516,848	723,848	502,141
Total Assets	5,852,561	7,147,181	5,971,861
Depreciation and amortization of property	42,336	38,315	35,095
Operating Segments [Member] | Financial Advisory Segment [Member]
Segment Reporting Information [Line Items]
Net Revenue	1,666,156	1,764,509	1,420,501
Operating Expenses	1,304,715	1,356,567	1,130,850
Operating Income (Loss)	361,441	407,942	289,651
Total Assets	1,099,921	1,239,964	1,181,783
Depreciation and amortization of property	8,968	8,480	6,104
Operating Segments [Member] | Asset Management Segment [Member]
Segment Reporting Information [Line Items]
Net Revenue	1,204,927	1,424,985	1,167,466
Operating Expenses	963,640	1,032,825	861,031
Operating Income (Loss)	241,287	392,160	306,435
Total Assets	978,083	1,128,549	958,588
Depreciation and amortization of property	9,390	5,618	3,730
Corporate [Member]
Segment Reporting Information [Line Items]
Net Revenue	(97,512)	3,554	(21,829)
Operating Expenses	(11,632)	79,808	72,116
Operating Income (Loss)	(85,880)	(76,254)	(93,945)
Total Assets	3,774,557	4,778,668	3,831,490
Depreciation and amortization of property	$ 23,978	$ 24,217	$ 25,261