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Acquisitions - Additional Information (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
Business
Client
Client_List
shares
Jun. 30, 2016
USD ($)
Client_List
shares
Dec. 31, 2016
USD ($)
Business Acquisition, Contingent Consideration [Line Items]      
Number of businesses acquired | Business 3    
Contingent consideration, current $ 18,396   $ 16,322
Contingent consideration, non-current 24,830   17,387
Goodwill 526,984   $ 487,484
Fair value of contingent consideration 800 $ 700  
Consideration paid in cash $ 4,800 $ 4,100  
Number of common stock issued | shares 177,000 220,000  
CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash $ 23,700    
Consideration paid in common stock 2,000    
Contingent consideration 17,500    
Contingent consideration, current 5,900    
Contingent consideration, non-current 11,600    
Goodwill $ 39,460    
Pacific Coastal Pension and Insurance Services, Inc. [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Feb. 01, 2017    
Acquired entity, name Pacific Coastal Pension and Insurance Services, Inc.    
Annual revenue $ 1,400    
Slaton Insurance [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jun. 01, 2017    
Acquired entity, name Slaton Insurance    
Annual revenue $ 2,600    
CMF Associates, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jun. 01, 2017    
Acquired entity, name CMF Associates, LLC    
Annual revenue $ 19,200    
Flex-Pay Business Services, Inc., (“Flex-Pay”), The Savitz Organization (“Savitz”) and Millimaki Eggert, L.L.P., (“Millimaki”) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   $ 33,000  
Consideration paid in common stock   1,600  
Contingent consideration   15,100  
Contingent consideration, current   4,400  
Contingent consideration, non-current   10,700  
Goodwill   26,471  
Millimaki Eggert L L P [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jan. 01, 2016    
Acquired entity, name Millimaki Eggert, L.L.P.    
Annual revenue $ 2,400    
Savitz Organization [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Apr. 01, 2016    
Acquired entity, name Savitz Organization    
Annual revenue $ 20,000    
Flex-Pay Business Services Inc [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jun. 01, 2016    
Acquired entity, name Flex-Pay Business Services, Inc.    
Estimated revenue $ 10,000    
Flex-Pay Business Services Inc [Member] | Minimum [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of employees covered | Client 3,600    
Acquisition of Client Lists [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   200  
Contingent consideration $ 700 $ 700  
Number of client list purchased | Client_List   3  
Guaranteed future consideration   $ 1,000  
Acquisition of Client Lists [Member] | Benefit And Insurance Services Practice Group      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List 1 2  
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List   1  
Previous Client Lists Purchases [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash $ 400