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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2023
USD ($)
shares
First Ireland Risk Management Ltd [Member]  
Business Acquisition [Line Items]  
Cash Paid $ 86,400,000
Escrow Deposited 5,300,000
Recorded Earnout Payable 5,900,000
Total Recorded Purchase Price 97,600,000
Maximum Potential Earnout Payable 6,600,000
BCHR Holdings, L.P. dba Buck [Member]  
Business Acquisition [Line Items]  
Cash Paid 600,800,000
Accrued Liability 500,000
Escrow Deposited 19,500,000
Total Recorded Purchase Price $ 620,800,000
Boley-Featherston-Huffman & Deal Co. [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 243
Common Share Value $ 45,200,000
Cash Paid 8,800,000
Escrow Deposited 6,000,000
Recorded Earnout Payable 7,900,000
Total Recorded Purchase Price 67,900,000
Maximum Potential Earnout Payable 15,000,000
Tay River Holdings Limited [Member]  
Business Acquisition [Line Items]  
Cash Paid 40,300,000
Accrued Liability 4,300,000
Escrow Deposited 2,400,000
Recorded Earnout Payable 32,400,000
Total Recorded Purchase Price 79,400,000
Maximum Potential Earnout Payable $ 88,700,000
Insurance By Ken Brown [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 273
Common Share Value $ 53,900,000
Cash Paid 1,800,000
Escrow Deposited 2,900,000
Recorded Earnout Payable 11,000,000
Total Recorded Purchase Price 69,600,000
Maximum Potential Earnout Payable $ 17,500,000
RHP General Agency [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 335
Common Share Value $ 65,700,000
Cash Paid 1,300,000
Escrow Deposited 5,000,000
Recorded Earnout Payable 3,300,000
Total Recorded Purchase Price 75,300,000
Maximum Potential Earnout Payable $ 11,000,000
Thirty-one Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 116
Common Share Value $ 19,500,000
Cash Paid 496,800,000
Accrued Liability 8,700,000
Escrow Deposited 25,900,000
Recorded Earnout Payable 96,300,000
Total Recorded Purchase Price 647,200,000
Maximum Potential Earnout Payable $ 160,000,000
2023 Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 967
Common Share Value $ 184,300,000
Cash Paid 1,236,200,000
Accrued Liability 13,500,000
Escrow Deposited 67,000,000
Recorded Earnout Payable 156,800,000
Total Recorded Purchase Price 1,657,800,000
Maximum Potential Earnout Payable $ 298,800,000