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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 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
Nine Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 14
Cash Paid $ 194,100,000
Accrued Liability 1,500,000
Escrow Deposited 8,900,000
Recorded Earnout Payable 38,100,000
Total Recorded Purchase Price 242,600,000
Maximum Potential Earnout Payable $ 56,100,000
2023 Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 14
Cash Paid $ 280,500,000
Accrued Liability 1,500,000
Escrow Deposited 14,200,000
Recorded Earnout Payable 44,000,000.0
Total Recorded Purchase Price 340,200,000
Maximum Potential Earnout Payable $ 62,700,000