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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Funds held for clients $ 213,457 $ 171,497  
Goodwill 487,484 447,685 $ 435,231
Millimaki Eggert, LLP(Millimaki), The Savitz organization (Savitz), Flex-Pay Business Services, Inc (Flex-pay), Ed Jacobs & Associates, Inc (EJ&A), Actuarial Consultants, Inc (ACT), The Seff Group,P.C (Seff) [Member]      
Business Acquisition [Line Items]      
Cash 10    
Accounts receivable, net 6,649    
Funds held for clients 37,230    
Property and equipment 440    
Other assets 294    
Identifiable intangible assets 22,177    
Accrued liabilities (1,133)    
Client fund obligations (37,230)    
Total identifiable net assets 28,437    
Goodwill 34,803    
Aggregate purchase price $ 63,240    
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Lewis Birch & Ricardo, LLC (LBR), Tegrit Group (Tegrit), Rognstad’s Inc. d.b.a. Sattler Insurance Agency (Sattler) and Weekes & Callaway (W&C) [Member]      
Business Acquisition [Line Items]      
Cash     1,381
Accounts receivable, net     4,204
Other assets     464
Identifiable intangible assets     17,952
Accounts payable     (3,319)
Accrued liabilities     (3,513)
Income taxes payable     (1,058)
Deferred taxes     (1,834)
Total identifiable net assets     14,277
Goodwill     51,873
Aggregate purchase price     $ 66,150
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member]      
Business Acquisition [Line Items]      
Accounts receivable, net   1,501  
Other assets   52  
Identifiable intangible assets   7,037  
Accounts payable   (62)  
Accrued liabilities   (1,552)  
Total identifiable net assets   6,976  
Goodwill   13,471  
Aggregate purchase price   $ 20,447