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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 961
Common Shares Issued $ 98,100,000
Cash Paid 148,000,000.0
Accrued Liability 1,800,000
Escrow Deposited 9,000,000.0
Recorded Earnout Payable 142,900,000
Total Recorded Purchase Price 399,800,000
Maximum Potential Earnout Payable $ 261,100,000
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 119,000,000.0
Total Recorded Purchase Price 246,400,000
Maximum Potential Earnout Payable 209,100,000
Hanover Excess and Surplus Inc and Hanover Finance Inc (HES) [Member]  
Business Acquisition [Line Items]  
Cash Paid 30,100,000
Escrow Deposited 3,000,000.0
Recorded Earnout Payable 200,000
Total Recorded Purchase Price 33,300,000
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 5,300,000
Total Recorded Purchase Price 36,300,000
Maximum Potential Earnout Payable $ 7,300,000
Nine Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 89
Common Shares Issued $ 6,700,000
Cash Paid 51,900,000
Accrued Liability 1,800,000
Escrow Deposited 5,000,000.0
Recorded Earnout Payable 18,400,000
Total Recorded Purchase Price 83,800,000
Maximum Potential Earnout Payable $ 35,400,000