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Segment Disclosures - Summary of Segment Information (Parenthetical) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($)
Financial Services [Member] |
Segment Reporting Information [Line Items] |
State payroll tax incentive associated with office relocation | $ 0.9
Benefits and Insurance Services [Member] |
Segment Reporting Information [Line Items] |
State payroll tax incentive associated with office relocation | 0.6
Corporate and Other [Member] |
Segment Reporting Information [Line Items] |
State payroll tax incentive associated with office relocation | $ 0.1

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- Definition State payroll tax incentive associated with office relocation. + References No definition available. + Details
Name: | cbz_StatePayrollTaxIncentiveAssociatedWithOfficeRelocation
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cbz_FinancialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cbz_BenefitsAndInsuranceServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |