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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 490,227 $ 389,846 $ 876,908 $ 701,190
Wholesale brokerage [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 329,225 255,959 574,051 447,083
Binding authorities [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees 59,751 53,596 122,744 108,641
Underwriting management [Member]        
Disaggregation of Revenue [Line Items]        
Net commissions and fees $ 101,251 $ 80,291 $ 180,113 $ 145,466