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Revenue - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition And Deferred Revenue [Abstract] |
Capitalized contract period | one year or less
Performance obligations period | one year or less

X
- Definition Capitalized contract period. + References No definition available. + Details
Name: | cbz_CapitalizedContractPeriod
Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Performance obligations period. + References No definition available. + Details
Name: | cbz_PerformanceObligationsPeriod
Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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