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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 778
Common Share Value $ 50,700,000
Cash Paid 560,400,000
Accrued Liability 400,000
Escrow Deposited 54,000,000
Recorded Earnout Payable 52,800,000
Total Recorded Purchase Price 718,300,000
Maximum Potential Earnout Payable $ 120,500,000
Market Financial Group, Ltd and Austin Consulting Group Inc. (MFG) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 53
Common Share Value $ 3,700,000
Cash Paid 33,900,000
Escrow Deposited 4,200,000
Recorded Earnout Payable 2,700,000
Total Recorded Purchase Price 44,500,000
Maximum Potential Earnout Payable 7,000,000
McGregor & Associates (M&A) [Member]  
Business Acquisition [Line Items]  
Cash Paid 13,500,000
Escrow Deposited 2,500,000
Recorded Earnout Payable 5,100,000
Total Recorded Purchase Price 21,100,000
Maximum Potential Earnout Payable 12,000,000
Pronto Insurance (PI) [Member]  
Business Acquisition [Line Items]  
Cash Paid 294,800,000
Escrow Deposited 18,700,000
Total Recorded Purchase Price $ 313,500,000
Reassurance Holdings, Inc (RHI) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 343
Common Share Value $ 24,400,000
Cash Paid 84,400,000
Escrow Deposited 13,300,000
Recorded Earnout Payable 8,300,000
Total Recorded Purchase Price 130,400,000
Maximum Potential Earnout Payable $ 21,500,000
25 Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 382
Common Share Value $ 22,600,000
Cash Paid 133,800,000
Accrued Liability 400,000
Escrow Deposited 15,300,000
Recorded Earnout Payable 36,700,000
Total Recorded Purchase Price 208,800,000
Maximum Potential Earnout Payable $ 80,000,000