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Employee Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) 50.00% | 80.00%cbz_DefinedContributionPlanMaximumEmployeeContributionPercentage |  |
Percentage of matching contribution made by company, of first 6% of participating employees contributions (as a percent) | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Percentage of participating employees contribution, matched 100% (as a percent) | 6.00%cbz_DefinedContributionPlanPercentageOfBaseCompensation |  |
Employer contribution | $ 8.5 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 7.9 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 7.2 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred gains or (losses) of investment | $ 3.7 cbz_DeferredCompensationPlanGainLossOnInvestments | $ 8.2 cbz_DeferredCompensationPlanGainLossOnInvestments | $ 4.3 cbz_DeferredCompensationPlanGainLossOnInvestments

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- Definition Deferred compensation plan gain loss on investments. + References No definition available. + Details
Name: | cbz_DeferredCompensationPlanGainLossOnInvestments
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Defined contribution plan maximum employee contribution percentage. + References No definition available. + Details
Name: | cbz_DefinedContributionPlanMaximumEmployeeContributionPercentage
Namespace Prefix: | cbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined contribution plan percentage of base compensation. + References No definition available. + Details
Name: | cbz_DefinedContributionPlanPercentageOfBaseCompensation
Namespace Prefix: | cbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration