Quarterly report pursuant to Section 13 or 15(d)

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

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Revenue from Contracts with Customers - Summary of Revenue from Contracts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 680,248 $ 573,020 $ 1,218,135 $ 1,020,533
Wholesale brokerage [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 444,129 381,616 767,574 667,466
Binding authorities [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 80,630 69,775 169,265 139,301
Underwriting management [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 155,489 $ 121,629 $ 281,296 $ 213,766