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Revenue - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Cloudoffering Employee Service	Dec. 31, 2018 USD ($)
Revenue [Line Items]
Contract asset	$ 38.2	$ 40.0
Revenue expected to be recognized, amount	$ 785.2
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.
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

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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