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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liability (Detail) - Level 3 [Member] - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ (33,368) |
Ending balance | (24,778) |
Contingent Purchase Price Payable [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | (33,368) | $ (25,196)
Additions from business acquisitions | (4,186) | (13,953)
Settlement of contingent purchase price liabilities | 9,816 | 2,285
Change in fair value of contingencies | 3,075 | 3,592
Change in net present value of contingencies | (115) | (97)
Ending balance | $ (24,778) | $ (33,369)

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- Definition Additions to the contingent liability resulting from business acquisitions. + References No definition available. + Details
Name: | cbz_AdditionsToContingencyFromBusinessAcquisitions
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in fair value of contingency. + References No definition available. + Details
Name: | cbz_ChangeInFairValueOfContingency
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Change in net present value of contingency. + References No definition available. + Details
Name: | cbz_ChangeInNetPresentValueOfContingency
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contingent purchase price liabilities. + References No definition available. + Details
Name: | cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Payment of contingent purchase price payable. + References No definition available. + Details
Name: | cbz_PaymentOfContingentPurchasePricePayable
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=cbz_ContingentPurchasePricePayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |