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Revenue - Additional Information (Detail) $ in Millions | 12 Months Ended
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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

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