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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 415
Common Share Value $ 22,100,000
Cash Paid 300,100,000
Accrued Liability 0
Escrow Deposited 25,400,000
Recorded Earnout Payable 69,400,000
Total Recorded Purchase Price 417,000,000
Maximum Potential Earnout Payable 146,900,000
Construction Risk Solutions, LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 27,900,000
Accrued Liability 0
Escrow Deposited 3,100,000
Recorded Earnout Payable 4,400,000
Total Recorded Purchase Price 35,400,000
Maximum Potential Earnout Payable 10,000,000
Hill, Chesson And Woody [Member]  
Business Acquisition [Line Items]  
Cash Paid 34,800,000
Accrued Liability 0
Escrow Deposited 700,000
Recorded Earnout Payable 15,900,000
Total Recorded Purchase Price 51,400,000
Maximum Potential Earnout Payable 24,400,000
Presidio Group, Inc. [Member]  
Business Acquisition [Line Items]  
Cash Paid 41,800,000
Accrued Liability 0
Escrow Deposited 4,800,000
Recorded Earnout Payable 7,000,000
Total Recorded Purchase Price 53,600,000
Maximum Potential Earnout Payable 15,000,000
Commercial Insurance Brokers [Member]  
Business Acquisition [Line Items]  
Cash Paid 17,700,000
Accrued Liability 0
Escrow Deposited 2,000,000
Recorded Earnout Payable 800,000
Total Recorded Purchase Price 20,500,000
Maximum Potential Earnout Payable $ 3,600,000
Williams - Mannny Insurance Group [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 170
Common Share Value $ 9,800,000
Cash Paid 28,200,000
Accrued Liability 0
Escrow Deposited 2,000,000
Recorded Earnout Payable 5,400,000
Total Recorded Purchase Price 45,400,000
Maximum Potential Earnout Payable 11,500,000
GPL Assurance Inc. (GPL) [Member]  
Business Acquisition [Line Items]  
Cash Paid 37,800,000
Accrued Liability 0
Escrow Deposited 4,200,000
Recorded Earnout Payable 4,300,000
Total Recorded Purchase Price 46,300,000
Maximum Potential Earnout Payable 8,000,000
Lutgert Insurance (LI) [Member]  
Business Acquisition [Line Items]  
Cash Paid 25,200,000
Accrued Liability 0
Escrow Deposited 1,300,000
Recorded Earnout Payable 4,400,000
Total Recorded Purchase Price 30,900,000
Maximum Potential Earnout Payable $ 10,200,000
Twenty- three Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 245
Common Share Value $ 12,300,000
Cash Paid 86,700,000
Accrued Liability 0
Escrow Deposited 7,300,000
Recorded Earnout Payable 27,200,000
Total Recorded Purchase Price 133,500,000
Maximum Potential Earnout Payable $ 64,200,000