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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 1,186
Common Shares Issued $ 119,300,000
Cash Paid 156,400,000
Accrued Liability 1,800,000
Escrow Deposited 11,600,000
Recorded Earnout Payable 160,700,000
Total Recorded Purchase Price 449,800,000
Maximum Potential Earnout Payable $ 275,700,000
Capsicum Reinsurance Brokers LLP (CRB) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 584
Common Shares Issued $ 62,900,000
Cash Paid 64,500,000
Recorded Earnout Payable 129,900,000
Total Recorded Purchase Price 257,300,000
Maximum Potential Earnout Payable 209,100,000
Hanover Excess and Surplus, Inc and Hanover Premium Finance, Inc (HES) [Member]  
Business Acquisition [Line Items]  
Cash Paid 30,100,000
Escrow Deposited 3,000,000.0
Total Recorded Purchase Price 33,100,000
Maximum Potential Earnout Payable $ 9,300,000
CRES Insurance Services, LLC [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 288
Common Shares Issued $ 28,500,000
Cash Paid 1,500,000
Escrow Deposited 1,000,000.0
Recorded Earnout Payable 5,500,000
Total Recorded Purchase Price 36,500,000
Maximum Potential Earnout Payable $ 7,300,000
Fourteen Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 314
Common Shares Issued $ 27,900,000
Cash Paid 60,300,000
Accrued Liability 1,800,000
Escrow Deposited 7,600,000
Recorded Earnout Payable 25,300,000
Total Recorded Purchase Price 122,900,000
Maximum Potential Earnout Payable $ 50,000,000.0