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Segment Disclosures - Additional Information (Detail) | 9 Months Ended
--- | ---
Sep. 30, 2014 Practice_Groups
Segment Reporting [Abstract] |
Number of business units of the company | 3

X
- Definition Number of practice groups. + References No definition available. + Details
Name: | cbz_NumberOfPracticeGroups
Namespace Prefix: | cbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration