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
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Net commissions and fees $ 447,513 $ 386,681
Wholesale brokerage [Member]    
Disaggregation of Revenue [Line Items]    
Net commissions and fees 285,850 244,827
Binding authorities [Member]    
Disaggregation of Revenue [Line Items]    
Net commissions and fees 69,526 62,993
Underwriting management [Member]    
Disaggregation of Revenue [Line Items]    
Net commissions and fees $ 92,137 $ 78,861