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Discontinued Operations and Divestitures - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2017 Business Office | Jun. 30, 2016 Business Office
Discontinued Operations And Disposal Groups [Abstract] |  |
Number of business divestiture | Office | 0 | 0
Number of businesses sold | Business | 0 | 0

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- Definition Discontinued operations number of operations sold. + References No definition available. + Details
Name: | cbz_DiscontinuedOperationsNumberOfOperationsSold
Namespace Prefix: | cbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of businesses sold. + References No definition available. + Details
Name: | cbz_NumberOfBusinessesSold
Namespace Prefix: | cbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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