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Discontinued Operations and Divestitures - Additional Information (Detail)	6 Months Ended
	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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration