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Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Corporate and municipal bonds | $ 36.4 cbz_CorporateAndMunicipalBondsParValue | $ 29.0 cbz_CorporateAndMunicipalBondsParValue
Maturity dates of bonds, start date | 2015-01 |
Maturity dates of bonds, end date | 2019-11 |

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- 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

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- 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

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- 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

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