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Commitments and Contingencies - Letters of Credit and Guarantees (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding | $ 3.0 | $ 1.7
License bonds outstanding amount | $ 2.3 | $ 2.2

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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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- 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