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Business Segment Information - Schedule of Financial Information About Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 537,396 $ 476,759 $ 1,567,961 $ 1,434,935
Expenses 355,658 337,290 1,052,768 1,017,577
Operating profit (loss) 181,738 139,469 515,193 417,358
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 138,734 119,664 401,272 372,980
Expenses 115,097 111,207 339,961 337,834
Operating profit (loss) 23,637 8,457 61,311 35,146
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 126,836 110,461 370,141 326,579
Expenses 70,152 64,280 206,063 192,004
Operating profit (loss) 56,684 46,181 164,078 134,575
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 71,626 70,479 214,911 219,914
Expenses 37,851 39,953 116,386 126,337
Operating profit (loss) 33,775 30,526 98,525 93,577
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 184,607 162,982 537,128 476,683
Expenses 114,118 103,585 334,955 308,483
Operating profit (loss) 70,489 59,397 202,173 168,200
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 15,593 13,173 44,509 38,779
Expenses 18,440 18,265 55,403 52,919
Operating profit (loss) $ (2,847) $ (5,092) $ (10,894) $ (14,140)