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Revenue - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Cloudoffering
Employee
Service
Customer
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revenue [Line Items]      
Number of customers | Customer 0    
Status of customer accounts No single customer accounts for 1% or more of our consolidated revenue for any of the periods presented.    
Float revenue $ 52.3 $ 80.2 $ 67.0
Contract asset $ 55.2 $ 43.2  
Remaining performance obligation, description of practical expedient   In accordance with the practical expedient provided in ASC Topic 606, performance obligations that are billed and recognized as they are delivered, primarily professional services contracts that are on a time and materials basis, are excluded from the transaction price for remaining performance obligations disclosed above.  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Revenue [Line Items]      
Status of customer accounts, percentage 1.00%    
Cloud Revenue [Member]      
Revenue [Line Items]      
Number of cloud offering delivering solution | Cloudoffering 2    
Powerpay [Member] | Maximum [Member]      
Revenue [Line Items]      
Number of employees generating revenue from recurring fees | Employee 20    
Bureau Revenue [Member]      
Revenue [Line Items]      
Number of primary service lines delivering solutions | Service 3    
Recurring Services      
Revenue [Line Items]      
Float revenue $ 52.3 $ 80.2 $ 67.0