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Commitments and Contingencies (Letters of Credit and Guarantees) - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Commitments And Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding | $ 0.9 | $ 2.3
License bonds outstanding amount | $ 2.9 | $ 2.5

X
- 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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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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