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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Goodwill $ 384,697 $ 375,122 $ 317,434
Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member]
      
Business Acquisition [Line Items]      
Cash 202    
Accounts receivable, net 578    
Other assets 137    
Identifiable intangible assets 3,002    
Accounts payable (835)    
Accrued liabilities (416)    
Deferred income taxes - non-current (1,165)    
Total identifiable net assets 1,503    
Goodwill 9,278    
Aggregate purchase price 10,781    
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member]
      
Business Acquisition [Line Items]      
Cash   422  
Funds held for clients   39,193  
Accounts receivable, net   7,618  
Fixed assets and other   1,300  
Identifiable intangible assets   39,300  
Accrued liabilities   (5,113)  
Client fund obligations   (39,193)  
Deferred income taxes - non-current   (1,236)  
Total identifiable net assets   42,291  
Goodwill   57,190  
Aggregate purchase price   99,481  
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
      
Business Acquisition [Line Items]      
Cash     273
Accounts receivable, net     3,606
Fixed assets and other     437
Identifiable intangible assets     11,072
Accrued liabilities     (924)
Deferred income taxes - non-current     (1,775)
Total identifiable net assets     12,689
Goodwill     16,869
Aggregate purchase price     $ 29,558