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Segment Disclosures - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013 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