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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 60
Common Share Value $ 3,700,000
Cash Paid 62,300,000
Accrued Liability 0
Escrow Deposited 8,600,000
Recorded Earnout Payable 13,600,000
Total Recorded Purchase Price 88,200,000
Maximum Potential Earnout Payable $ 31,100,000
Market Financial Group, Ltd and Austin Consulting Group Inc. (MFG) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 53
Common Share Value $ 3,700,000
Cash Paid 33,900,000
Accrued Liability 0
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
Accrued Liability 0
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
Five Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 7
Cash Paid $ 14,900,000
Accrued Liability 0
Escrow Deposited 1,900,000
Recorded Earnout Payable 4,500,000
Total Recorded Purchase Price 21,300,000
Maximum Potential Earnout Payable $ 12,100,000