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Acquisitions - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2019
USD ($)
Business
Client_List
shares
Sep. 30, 2018
USD ($)
Business
Client_List
shares
Dec. 31, 2018
USD ($)
Business Acquisition, Contingent Consideration [Line Items]      
Number of businesses acquired | Business 6 2  
Consideration paid in cash $ 19,400,000 $ 23,400,000  
Consideration paid in common stock 2,000,000.0 900,000  
Contingent consideration 11,200,000 12,400,000  
Cash 800,000    
Acquired client funds 6,900,000    
Contingent consideration arrangements - High 11,600,000    
Aggregate fair value of contingent consideration 10,300,000    
Contingent consideration, current 15,839,000   $ 22,538,000
Contingent consideration, non-current 16,030,000   17,170,000
Annual aggregate revenue 17,400,000 9,100,000  
Goodwill 588,213,000   $ 564,300,000
Changes in fair value of contingent consideration 300,000 3,300,000  
Consideration paid in cash $ 16,300,000 $ 11,000,000.0  
Number of common stock issued | shares 98,000 66,000  
Contingent Purchase Price Liability – Current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration, current $ 2,900,000 $ 3,400,000  
Contingent Purchase Price Liability – Non-current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration, non-current $ 7,400,000 $ 9,000,000.0  
Wenner Group, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jan. 01, 2019    
Acquired entity, name Wenner Group, LLC    
Paydayta, Inc. [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jul. 01, 2019    
Acquired entity, name Paydayta, Inc.    
Gavion, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Jul. 01, 2019    
Acquired entity, name Gavion, LLC    
QBA Benefits, LLC. [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Aug. 01, 2019    
Acquired entity, name QBA Benefits, LLC.    
Ericson CPAs [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Aug. 01, 2019    
Acquired entity, name Ericson CPAs    
Brinig Taylor Zimmer, Inc. [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition Sep. 01, 2019    
Acquired entity, name Brinig Taylor Zimmer, Inc.    
InR Advisory Services, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition   Apr. 01, 2018  
Acquired entity, name   InR Advisory Services, LLC  
Laurus Transaction Advisors, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Effective date of acquisition   Feb. 01, 2018  
Acquired entity, name   Laurus Transaction Advisors, LLC  
Jun. 30, 2019 InR Advisory Services, LLC (“InR”) and Laurus Transaction Advisors, LLC (“Laurus”) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Goodwill $ 24,400,000 $ 32,300,000  
Acquisition of Client Lists [Member] | Benefits and Insurance Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration $ 200,000    
Number of client lists purchased | Client_List 1    
Consideration transferred $ 300,000    
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration   $ 300,000  
Number of client lists purchased | Client_List   1  
Previous Client List Purchases [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash $ 700,000 $ 1,100,000