v3.26.3
Revenue from Contracts with Customers - Summary of Revenue with Customers by Specialty (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 775,081 $ 739,552 $ 2,460,712 $ 2,256,537
Wholesale Brokerage        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 394,283 376,788 1,270,881 1,214,741
Binding Authority        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 93,012 89,636 303,182 286,110
Underwriting Management        
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 287,786 $ 273,128 $ 886,649 $ 755,686