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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Sep. 26, 2019
Commitments And Contingencies [Line Items]      
Recognized an undiscounted liability $ 5.0 $ 4.8  
Isolated Service Incident [Member]      
Commitments And Contingencies [Line Items]      
Duplicate payments for payroll customers     $ 18.8
Loss on unrecovered duplicate payments 11.2    
Recovery efforts resulting in collection   $ 0.4  
Isolated Service Incident [Member] | Selling, General and Administrative Expense [Member]      
Commitments And Contingencies [Line Items]      
Loss on unrecovered duplicate payments $ 11.2