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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 688
Common Share Value $ 37,700,000
Cash Paid 372,400,000
Accrued Liability 0
Escrow Deposited 34,600,000
Recorded Earnout Payable 101,200,000
Total Recorded Purchase Price 545,900,000
Maximum Potential Earnout Payable 201,000,000
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 - Manny 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 5,800,000
Total Recorded Purchase Price 47,800,000
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 6,400,000
Total Recorded Purchase Price 32,900,000
Maximum Potential Earnout Payable 10,200,000
DiBrina Group (DBG) [Member]  
Business Acquisition [Line Items]  
Cash Paid 38,600,000
Accrued Liability 0
Escrow Deposited 4,500,000
Recorded Earnout Payable 13,100,000
Total Recorded Purchase Price 56,200,000
Maximum Potential Earnout Payable $ 24,200,000
31 Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 518
Common Share Value $ 27,900,000
Cash Paid 120,400,000
Accrued Liability 0
Escrow Deposited 12,000,000
Recorded Earnout Payable 42,400,000
Total Recorded Purchase Price 202,700,000
Maximum Potential Earnout Payable $ 94,100,000