Segment information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Total	$ 237,222	$ 340,293	$ 503,250	$ 713,575
Pre-Tax Income (Loss)
Total pre-tax income (loss)	(6,169)	43,168	8,044	95,295
Private Client Division
Revenue
Total	144,471	166,863	295,318	330,886
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 38,800	21,673	62,946	45,936
Asset management fees (as a percent)	90.00%
Asset Management
Revenue
Total	$ 24,315	25,544	51,432	49,774
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 8,120	8,638	17,594	16,191
Asset management fees (as a percent)	10.00%
Capital markets
Revenue
Total	$ 71,274	147,945	156,325	331,544
Pre-Tax Income (Loss)
Total pre-tax income (loss)	(17,935)	39,373	(16,769)	89,364
Corporate/Other
Revenue
Total	(2,838)	(59)	175	1,371
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ (35,154)	$ (26,516)	$ (55,727)	$ (56,196)