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Business Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 18, 2018
Oct. 03, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Amortization expense for purchased intangible assets       $ 4,093,000 $ 4,574,000 $ 4,738,000
Stock issued for acquisition       3,371,000   $ 2,922,000
E D I Admin [Member]            
Business Acquisition [Line Items]            
Payments to acquire business   $ 7,461,000        
Maximum payout of contingent consideration   $ 1,700,000        
Amortization expense for purchased intangible assets     $ 100,000      
E D I Admin [Member] | Contingent Consideration Liability [Member]            
Business Acquisition [Line Items]            
Other expense       $ 100,000    
CovalentWorks [Member]            
Business Acquisition [Line Items]            
Payments to acquire business $ 19,431,000          
Stock issued for acquisition $ 3,371,000          
Stock issued for acquisition, Shares 40,478