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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 1,843
Common Share Value $ 189,700,000
Cash Paid 398,300,000
Accrued Liability 50,000,000.0
Escrow Deposited 30,700,000
Recorded Earnout Payable 207,400,000
Total Recorded Purchase Price 876,100,000
Maximum Potential Earnout Payable $ 387,900,000
Capsicum Reinsurance Brokers LLP (CRB) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 584
Common Share Value $ 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 & 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 (CRES) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 288
Common Share Value $ 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
Optimum Talent Inc. (OTI) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 102
Common Share Value $ 11,100,000
Cash Paid 14,100,000
Escrow Deposited 3,400,000
Recorded Earnout Payable 14,000,000.0
Total Recorded Purchase Price 42,600,000
Maximum Potential Earnout Payable 21,100,000
Ashton Tiffany, LLC (AT) [Member]  
Business Acquisition [Line Items]  
Cash Paid 48,300,000
Accrued Liability 48,200,000
Recorded Earnout Payable 9,000,000.0
Total Recorded Purchase Price 105,500,000
Maximum Potential Earnout Payable $ 20,000,000.0
Cool Insuring Agency, Inc. (CIA) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 406
Common Share Value $ 48,400,000
Cash Paid 65,000,000.0
Escrow Deposited 7,200,000
Recorded Earnout Payable 8,500,000
Total Recorded Purchase Price 129,100,000
Maximum Potential Earnout Payable $ 30,000,000.0
Harden & Associates, Inc. (HAI) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 49
Cash Paid $ 95,600,000
Escrow Deposited 6,200,000
Recorded Earnout Payable 10,000,000.0
Total Recorded Purchase Price 111,800,000
Maximum Potential Earnout Payable $ 22,500,000
Twenty Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 414
Common Share Value $ 38,800,000
Cash Paid 79,200,000
Accrued Liability 1,800,000
Escrow Deposited 9,900,000
Recorded Earnout Payable 30,500,000
Total Recorded Purchase Price 160,200,000
Maximum Potential Earnout Payable $ 68,600,000