Segment information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Total	$ 306,189	$ 237,222	$ 627,868	$ 503,250
Pre-Tax Income (Loss)
Total pre-tax income (loss)	(11,699)	(6,169)	7,350	8,044
Corporate/Other
Revenue
Total	3,164	(2,838)	7,181	175
Pre-Tax Income (Loss)
Total pre-tax income (loss)	(24,975)	(35,154)	(51,386)	(55,727)
Private Client
Revenue
Total	$ 201,245	$ 144,471	$ 404,666	$ 295,318
Pre-Tax Income (Loss)
Asset management fees (as a percent)	90.00%	90.00%	90.00%	90.00%
Private Client | Operating Segments
Revenue
Total	$ 201,245	$ 144,471	$ 404,666	$ 295,318
Pre-Tax Income (Loss)
Total pre-tax income (loss)	20,794	38,800	75,250	62,946
Asset Management
Revenue
Total	$ 22,198	$ 24,315	$ 46,157	$ 51,432
Pre-Tax Income (Loss)
Asset management fees (as a percent)	10.00%	10.00%	10.00%	10.00%
Asset Management | Operating Segments
Revenue
Total	$ 22,198	$ 24,315	$ 46,157	$ 51,432
Pre-Tax Income (Loss)
Total pre-tax income (loss)	6,533	8,120	13,014	17,594
Capital markets
Revenue
Total	79,582	71,274	169,864	156,325
Capital markets | Operating Segments
Revenue
Total	79,582	71,274	169,864	156,325
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ (14,051)	$ (17,935)	$ (29,528)	$ (16,769)