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Commitments and Contingencies (Letters of Credit and Guarantees) - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Commitments And Contingencies [Line Items] |  |
License bonds outstanding amount | $ 2.4 | $ 2.3
Letters of Credit [Member] |  |
Commitments And Contingencies [Line Items] |  |
Letters of credit outstanding | $ 2.3 | $ 2.3

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- Definition Commitments and contingencies. + References No definition available. + Details
Name: | cbz_CommitmentsAndContingenciesLineItems
Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition License bonds outstanding. + References No definition available. + Details
Name: | cbz_LicenseBondsOutstandingAmount
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |