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Business Combinations and Asset Acquisitions - Summary of Fair Value of Components of Purchase Consideration (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Oct. 09, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Total $ 11.0    
2021 Acquisitions      
Business Acquisition [Line Items]      
Cash paid at closing 148.6    
Class A common stock issued 5.8    
Cash to be paid after closing 21.8    
Contingent consideration 5.6    
Non-controlling interest 3.8    
Total 185.6    
2020 Acquisitions | Modus Technologies, Inc.      
Business Acquisition [Line Items]      
Cash paid at closing 27.7    
Cash to be paid after closing 2.0    
Contingent consideration (payable in the form of cash and Class A common stock) 20.0    
Contingent consideration   $ 50.0  
Total 49.7    
2020 Acquisitions | Other      
Business Acquisition [Line Items]      
Cash paid at closing 0.9    
Cash to be paid after closing 0.0    
Contingent consideration (payable in the form of cash and Class A common stock) 0.0    
Total 0.9    
2019 Acquisitions | Other      
Business Acquisition [Line Items]      
Cash paid at closing 14.6    
Elimination of pre-existing relationships 0.0    
Contingent consideration 7.4   $ 13.1
Total 22.0    
2019 Acquisitions | Contactually, Inc      
Business Acquisition [Line Items]      
Cash paid at closing 24.5    
Elimination of pre-existing relationships 1.6    
Contingent consideration 0.0    
Total $ 26.1