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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 415
Common Share Value $ 22,100,000
Cash Paid 214,600,000
Accrued Liability 0
Escrow Deposited 18,000,000
Recorded Earnout Payable 50,700,000
Total Recorded Purchase Price 305,400,000
Maximum Potential Earnout Payable 110,800,000
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 700,000
Total Recorded Purchase Price 20,400,000
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 3,900,000
Total Recorded Purchase Price 43,900,000
Maximum Potential Earnout Payable $ 11,500,000
Eighteen Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 245
Common Share Value $ 12,300,000
Cash Paid 64,200,000
Accrued Liability 0
Escrow Deposited 5,400,000
Recorded Earnout Payable 18,800,000
Total Recorded Purchase Price 100,700,000
Maximum Potential Earnout Payable $ 46,300,000