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Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Corporate and municipal bonds	$ 29.3	$ 28.2
Maturity dates of bonds, start date	2013-07
Maturity dates of bonds, end date	2018-04

X

- Definition

Corporate and municipal bonds par value.

+ References

No definition available.

+ Details

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

X

- Definition

Maturity date of bond end date.

+ References

No definition available.

+ Details

Name:	cbz_MaturityDateOfBondEndDate
Namespace Prefix:	cbz_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maturity date of bond start date.

+ References

No definition available.

+ Details

Name:	cbz_MaturityDateOfBondStartDate
Namespace Prefix:	cbz_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Details

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