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Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Nov. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Restructuring Cost And Reserve [Line Items]        
Goodwill   $ 802,675   $ 793,892
March 2021 UK Acquisition [Member]        
Restructuring Cost And Reserve [Line Items]        
Goodwill     $ 3,100  
Intangible assets     3,000  
Cash, net of cash acquired     $ 7,600  
Form I-9 Compliance [Member]        
Restructuring Cost And Reserve [Line Items]        
Cash consideration   19,087    
Current assets   1,151    
Liabilities assumed   325    
Cash, net of cash acquired   $ 19,800    
Corporate Screening Services, LLC [Member]        
Restructuring Cost And Reserve [Line Items]        
Goodwill $ 22,200      
Intangible assets 15,500      
Customer list $ 11,800      
Intangible asset, estimated useful life 14 years      
Current assets $ 2,900      
Liabilities assumed $ 1,600      
Business acquisition, Percentage acquired 100.00%      
Cash, net of cash acquired $ 39,400      
Developed Technology [Member] | Corporate Screening Services, LLC [Member]        
Restructuring Cost And Reserve [Line Items]        
Intangible assets $ 3,600      
Intangible asset, estimated useful life 5 years