Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts With Customers - Summary of Revenue from Contracts (Details)

v3.22.0.1
Revenue from Contracts With Customers - Summary of Revenue from Contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]      
Net commissions and fees $ 1,432,179 $ 1,016,685 $ 758,448
Wholesale brokerage [Member]      
Disaggregation Of Revenue [Line Items]      
Net commissions and fees 931,979 673,090 508,503
Binding authorities [Member]      
Disaggregation Of Revenue [Line Items]      
Net commissions and fees 209,622 144,837 103,853
Underwriting management [Member]      
Disaggregation Of Revenue [Line Items]      
Net commissions and fees $ 290,578 $ 198,758 $ 146,092