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Discontinued Operations and Divestitures (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012 Segment
Discontinued Operations and Divestitures (Textual) [Abstract]
Discontinued Operations, Number of Operations Sold	0	0
Gain from the sale of its individual wealth management business		$ 2.5
Cash received from sale of business and client list		0.1
Cash proceed from sale of business and client list		$ 1.0

X

- Definition

Cash proceed from sale of business and client list.

+ References

No definition available.

+ Details

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

X

- Definition

Cash received from sale of business and client list.

+ References

No definition available.

+ Details

Name:	cbz_CashReceivedFromSaleOfBusinessAndClientList
Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	cbz_DiscontinuedOperationsAndDivestituresTextualAbstract
Namespace Prefix:	cbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

No definition available.

+ Details

Name:	us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration