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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 523
Common Share Value $ 41,200,000
Cash Paid 749,600,000
Accrued Liability 200,000
Escrow Deposited 30,300,000
Recorded Earnout Payable 132,200,000
Total Recorded Purchase Price 953,500,000
Maximum Potential Earnout Payable $ 211,800,000
Inverson Holding Company - Company, LLC (IHC) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 452
Common Share Value $ 35,900,000
Cash Paid 31,200,000
Escrow Deposited 4,500,000
Recorded Earnout Payable 20,900,000
Total Recorded Purchase Price 92,500,000
Maximum Potential Earnout Payable 35,000,000.0
James Brown Inc. (JBI) [Member]  
Business Acquisition [Line Items]  
Cash Paid 65,900,000
Escrow Deposited 8,700,000
Total Recorded Purchase Price 74,600,000
Limited SPG [Member]  
Business Acquisition [Line Items]  
Cash Paid 326,800,000
Escrow Deposited 4,800,000
Total Recorded Purchase Price 331,600,000
RPA Insurance Services LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 44,000,000.0
Escrow Deposited 3,900,000
Recorded Earnout Payable 16,900,000
Total Recorded Purchase Price 64,800,000
Maximum Potential Earnout Payable 22,000,000.0
JLT Aerospace [Member]  
Business Acquisition [Line Items]  
Cash Paid 162,800,000
Recorded Earnout Payable 63,600,000
Total Recorded Purchase Price 226,400,000
Maximum Potential Earnout Payable $ 75,100,000
Ninteen Other Acquisition [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 71
Common Share Value $ 5,300,000
Cash Paid 118,900,000
Accrued Liability 200,000
Escrow Deposited 8,400,000
Recorded Earnout Payable 30,800,000
Total Recorded Purchase Price 163,600,000
Maximum Potential Earnout Payable $ 79,700,000