Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Summary of Revenue from Contracts (Detail)

v3.23.2
Revenue from Contracts with Customers - Summary of Revenue from Contracts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 573,020 $ 490,227 $ 1,020,533 $ 876,908
Wholesale brokerage [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 381,616 329,225 667,466 574,051
Binding authorities [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 69,775 59,751 139,301 122,744
Underwriting management [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 121,629 $ 101,251 $ 213,766 $ 180,113