Segment Reporting - Net Income By Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	$ 58,047	$ 19,970
Operating Expenses [Abstract]
Compensation and employee benefits	63,172	13,560
Systems, technology and telephone	3,828	1,440
Sales, distribution and marketing	526	218
Occupancy costs	3,180	968
Professional fees	22,884	1,415
Travel and entertainment	1,946	267
Depreciation and amortization	4,517	610
General, administrative and other	1,432	318
Total operating expenses	101,485	18,796
Operating Income (Loss)	(43,438)	1,174
Gain (loss) on warrant liability	(12,942)	0
Gain (loss) on earn-out liability	(29,206)	0
Interest and dividend income (expense)	(3,261)	(74)
Other income	58	(2)
Income (loss) before taxes	(85,640)	1,079
Income tax (expense) benefit	(4,650)	(193)
Net income (loss)	(90,290)	886
Gain (loss) on investments	3,149	(19)
Asset management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	26,515
Operating Expenses [Abstract]
Compensation and employee benefits	27,262
Systems, technology and telephone	1,193
Sales, distribution and marketing	250
Occupancy costs	1,205
Professional fees	12,257
Travel and entertainment	990
Depreciation and amortization	2,739
General, administrative and other	454
Total operating expenses	46,350
Operating Income (Loss)	(19,835)
Gain (loss) on warrant liability	(6,471)
Gain (loss) on earn-out liability	(14,603)
Interest and dividend income (expense)	(1,753)
Other income	0
Income (loss) before taxes	(38,540)
Income tax (expense) benefit	(2,325)
Net income (loss)	(40,865)
Gain (loss) on investments	4,122
Wealth management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	31,532
Operating Expenses [Abstract]
Compensation and employee benefits	35,910
Systems, technology and telephone	2,635
Sales, distribution and marketing	276
Occupancy costs	1,975
Professional fees	10,627
Travel and entertainment	956
Depreciation and amortization	1,778
General, administrative and other	978
Total operating expenses	55,135
Operating Income (Loss)	(23,603)
Gain (loss) on warrant liability	(6,471)
Gain (loss) on earn-out liability	(14,603)
Interest and dividend income (expense)	(1,508)
Other income	58
Income (loss) before taxes	(47,100)
Income tax (expense) benefit	(2,325)
Net income (loss)	(49,425)
Gain (loss) on investments	(973)
Management/Advisory fees
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	46,470	19,970
Management/Advisory fees | Asset management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	14,976
Management/Advisory fees | Wealth management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	31,494
Incentive fees
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	577	0
Incentive fees | Asset management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	577
Incentive fees | Wealth management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	0
Distributions from investments
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	10,030	0
Distributions from investments | Asset management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	10,030
Distributions from investments | Wealth management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	0
Other fees/income
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	970	$ 0
Other fees/income | Asset management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	932
Other fees/income | Wealth management
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total income	$ 38