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Subsequent Events - Additional Information (Detail) $ in Millions	Jul. 01, 2016 USD ($)
Subsequent Event [Member] | Ed Jacobs & Associates Inc [Member]
Subsequent Event [Line Items]
Estimated revenue	$ 2.1

X

- Definition

Business acquisition estimated revenue.

+ References

No definition available.

+ Details

Name:	cbz_BusinessAcquisitionEstimatedRevenue
Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cbz_EdJacobsAssociatesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: