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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Business Acquisition [Line Items]      
Funds held for clients $ 205,867 $ 171,497  
Goodwill 474,095 $ 447,685  
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member]      
Business Acquisition [Line Items]      
Cash 6    
Accounts receivable, net 5,313    
Funds held for clients 37,230    
Property and equipment, net 383    
Other assets 172    
Identifiable intangible assets 17,755    
Current liabilities (378)    
Client fund obligations (37,230)    
Total identifiable net assets 23,251    
Goodwill 26,471    
Aggregate purchase price $ 49,722    
Model Consulting, Inc [Member]      
Business Acquisition [Line Items]      
Identifiable intangible assets     $ 2,844
Total identifiable net assets     2,844
Goodwill     6,865
Aggregate purchase price     $ 9,709