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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
 6 Months Ended
Jun. 30, 2021
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 152,000.0
Common Share Value $ 19,400,000
Cash Paid 592,000,000.0
Accrued Liability 100,000
Escrow Deposited 25,700,000
Recorded Earnout Payable 49,200,000
Total Recorded Purchase Price 686,400,000
Maximum Potential Earnout Payable 105,500,000
Atlas General Holdings LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 95,200,000
Escrow Deposited 5,400,000
Recorded Earnout Payable 8,700,000
Total Recorded Purchase Price 109,300,000
Maximum Potential Earnout Payable 35,000,000.0
Bollington Wilson Group [Member]  
Business Acquisition [Line Items]  
Cash Paid 328,000,000.0
Escrow Deposited 1,400,000
Total Recorded Purchase Price 329,400,000
LDJ American Online Benefits Group, LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 38,200,000
Escrow Deposited 7,100,000
Recorded Earnout Payable 14,800,000
Total Recorded Purchase Price 60,100,000
Maximum Potential Earnout Payable $ 20,000,000.0
Eleven Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 152,000.0
Common Share Value $ 19,400,000
Cash Paid 130,600,000
Accrued Liability 100,000
Escrow Deposited 11,800,000
Recorded Earnout Payable 25,700,000
Total Recorded Purchase Price 187,600,000
Maximum Potential Earnout Payable $ 50,500,000