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Acquisitions - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Business
Client_List
shares
Dec. 31, 2017
USD ($)
Business
Client_List
shares
Dec. 31, 2016
USD ($)
Business
Client_List
shares
Business Acquisition, Contingent Consideration [Line Items]      
Number of businesses acquired | Business 3 4 6
Contingent consideration, current $ 22,538 $ 15,151  
Contingent consideration, non-current 17,170 22,423  
Annual revenue 11,000 25,700 $ 41,200
Goodwill 564,300 528,424 487,484
Consideration paid in cash $ 11,000 $ 9,800 $ 7,100
Number of common stock issued | shares 100,000 300,000 400,000
Changes in fair value of contingent consideration $ 2,600 $ (1,500) $ (1,300)
Laurus Transaction Advisors, LLC. (“Laurus”), InR Advisory Services, LLC (“InR”) and Sequoia Financial Group, LLC. (“Sequoia”) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash 27,900    
Consideration paid in common stock 900    
Contingent consideration 13,400    
Contingent arrangements arising from acquisitions 15,300    
Fair value of obligation at acquisition date 13,400    
Contingent consideration, current 3,900    
Contingent consideration, non-current 9,500    
Goodwill 36,054    
Pacific Coastal Pension and Insurance Services, Inc. (“Pacific Coastal”), CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and McKay & Carnahan, Inc. ("McKay") [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   24,200  
Consideration paid in common stock   2,000  
Contingent consideration   19,300  
Contingent arrangements arising from acquisitions   20,300  
Fair value of obligation at acquisition date   19,300  
Contingent consideration, current   6,300  
Contingent consideration, non-current   13,000  
Goodwill   40,587  
Millimaki Eggert, LLP("Millimaki"), The Savitz organization ("Savitz"), Flex-Pay Business Services, Inc ("Flex-pay"), Ed Jacobs & Associates, Inc ("Ed Jacobs"), Actuarial Consultants, Inc ("ACT"), The Seff Group,P.C ("Seff") [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash     40,000
Consideration paid in common stock     2,100
Contingent consideration     21,100
Contingent arrangements arising from acquisitions     23,500
Fair value of obligation at acquisition date     21,100
Contingent consideration, current     6,600
Contingent consideration, non-current     14,500
Goodwill     34,803
Acquisition of Client Lists [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash     1,200
Contingent consideration $ 200 $ 1,400 $ 1,500
Number of client list purchased | Client_List 1 2 7
Guaranteed future consideration     $ 1,200
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List     1
Acquisition of Client Lists [Member] | Maximum [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash $ 300 $ 100  
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List 1 1  
Acquisition of Client Lists [Member] | Benefit and Insurance Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List   1 6