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Financial Data by Segment and Geographic Area - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 Segment Employees Service | Dec. 31, 2017 Segment Employees Service Customer
Segment Reporting Information [Line Items] |  |
Number of operating segments | 1 | 1
Number of reportable segments | 1 | 1
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.
Status of customer accounts, percentage |  | 1.00%
Cloud Revenue [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of cloud offering delivering solution | 2 | 2
Powerpay [Member] | Maximum [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of employees generating revenue from recurring fees | Employees | 20 | 20
Bureau Revenue [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of primary service lines delivering solutions | Service | 3 | 3

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