Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,139,172	$ 1,718,221	$ 1,338,501
Management Fees	66,670	72,287	47,515
Incentive income	646	2,732	592
Operating Company
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,138,488	1,717,308	1,337,542
Management Fees	65,986	71,374	46,556
Incentive income	646	2,732	592
Operating Company | Investment banking revenue
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	494,842	1,067,162	769,486
Operating Company | Underwriting fees
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	114,201	421,081	427,670
Operating Company | Strategic/financial advisory fees
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	248,268	433,909	190,958
Operating Company | Placement and sales agent fees
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	120,629	195,676	133,171
Operating Company | Expense reimbursements from clients
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11,744	16,496	17,687
Operating Company | Brokerage
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	577,014	576,040	520,908
Operating Company | Commissions
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	522,670	530,927	479,762
Operating Company | Trade conversion
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30,233	24,098	21,389
Operating Company | Equity and credit research fees
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	24,111	21,015	19,757
Asset Company
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	684	913	959
Management Fees	$ 684	$ 913	$ 959