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Business Combinations - Acquisition Method for Recording Business Combinations (Detail) - USD ($)
shares in Thousands
 6 Months Ended
Jun. 26, 2018
Jun. 30, 2018
Business Acquisition [Line Items]    
Common Shares Issued   273
Common Share Value $ 24,400,000 $ 15,900,000
Cash Paid   424,200,000
Accrued Liability   400,000
Escrow Deposited   35,300,000
Recorded Earnout Payable   31,000,000
Total Recorded Purchase Price   506,800,000
Maximum Potential Earnout Payable   $ 71,100,000
Market Financial Group, Ltd and Austin Consulting Group Inc. (MFG) [Member]    
Business Acquisition [Line Items]    
Common Shares Issued   53
Common Share Value   $ 3,700,000
Cash Paid   33,900,000
Escrow Deposited   4,200,000
Recorded Earnout Payable   4,000,000
Total Recorded Purchase Price   45,800,000
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
Sixteen Other Acquisitions [Member]    
Business Acquisition [Line Items]    
Common Shares Issued   220
Common Share Value   $ 12,200,000
Cash Paid   82,000,000
Accrued Liability   400,000
Escrow Deposited   9,900,000
Recorded Earnout Payable   21,900,000
Total Recorded Purchase Price   126,400,000
Maximum Potential Earnout Payable   $ 52,100,000