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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |  |
Increase to the environmental reserve | $ 5.9 |
Recognized an undiscounted liability | $ 6.2 | $ 5.4

X
- Definition Increase Decrease In Environmental Remediation Reserve + References No definition available. + Details
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Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax receivable agreement undiscounted liability. + References No definition available. + Details
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Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration