v3.26.1
Segment Reporting - Summary of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]            
Net commissions and fees $ 902,728   $ 840,857   $ 1,685,631 $ 1,516,985
Fiduciary investment income 13,919   14,313   26,245 28,351
Total revenue 916,647   855,170   1,711,876 1,545,336
General and administrative expense 118,643   107,049   227,404 213,109
Change in contingent consideration 17,551   (759)   44,845 (14,801)
Interest income (1,700)   (1,500)   (2,800) (4,600)
Income from equity method investments (7,039)   (5,156)   (12,570) (10,093)
Other non-operating loss (income) (25)   143   (736) (234)
Income tax expense 22,350   13,026   28,858 68,456
NET INCOME 108,381 $ 40,597 124,705 $ (4,389) 148,978 120,316
Reporting Segment            
Segment Reporting [Line Items]            
Net commissions and fees 902,728   840,857   1,685,631 1,516,985
Fiduciary investment income 13,919   14,313   26,245 28,351
Total revenue 916,647   855,170   1,711,876 1,545,336
Compensation-related expense 494,946   453,414   956,778 850,842
General and administrative expense 94,797   93,350   196,162 185,587
Other segment items 60,517   45,557   101,257 92,241
Depreciation and amortization 68,520   72,556   137,922 140,180
Change in contingent consideration 17,551   (759)   44,845 (14,801)
Interest income (1,653)   (1,482)   (2,799) (4,585)
Interest expense 58,302   59,816   113,181 117,427
Income from equity method investments (7,039)   (5,156)   (12,570) (10,093)
Other non-operating loss (income) (25)   143   (736) (234)
Income tax expense $ 22,350   $ 13,026   $ 28,858 $ 68,456