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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
shares
Devitt Insurance Services Ltd [Member]  
Business Acquisition [Line Items]  
Cash Paid $ 73,600,000
Accrued Liability 1,300,000
Escrow Deposited 3,400,000
Recorded Earnout Payable 12,600,000
Total Recorded Purchase Price 90,900,000
Maximum Potential Earnout Payable 12,500,000
Innovu Group Holding Company Limited [Member]  
Business Acquisition [Line Items]  
Cash Paid 85,400,000
Total Recorded Purchase Price $ 85,400,000
F3 Companies [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 352
Common Share Value $ 61,700,000
Cash Paid 33,100,000
Escrow Deposited 5,000,000.0
Recorded Earnout Payable 6,100,000
Total Recorded Purchase Price 105,900,000
Maximum Potential Earnout Payable 25,000,000.0
M&T Insurance Agency [Member]  
Business Acquisition [Line Items]  
Cash Paid 171,000,000.0
Total Recorded Purchase Price $ 171,000,000.0
PIUS Limited LLC [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 74
Common Share Value $ 10,600,000
Cash Paid 35,600,000
Escrow Deposited 3,800,000
Recorded Earnout Payable 116,400,000
Total Recorded Purchase Price 166,400,000
Maximum Potential Earnout Payable $ 150,000,000.0
Thirty-Two Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 300
Common Share Value $ 50,600,000
Cash Paid 457,200,000
Accrued Liability 41,700,000
Escrow Deposited 27,000,000.0
Recorded Earnout Payable 106,900,000
Total Recorded Purchase Price 683,400,000
Maximum Potential Earnout Payable $ 230,200,000
2022 Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 726
Common Share Value $ 122,900,000
Cash Paid 855,900,000
Accrued Liability 43,000,000.0
Escrow Deposited 39,200,000
Recorded Earnout Payable 242,000,000.0
Total Recorded Purchase Price 1,303,000,000.0
Maximum Potential Earnout Payable $ 417,700,000