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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, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Ending balance | $ (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue | $ (25,196)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Contingent Purchase Price Payable [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | (25,196)cbz_ContingentPurchasePriceLiabilitiesAtFairValue / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (30,012)cbz_ContingentPurchasePriceLiabilitiesAtFairValue / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Additions from business acquisitions | (19,353)cbz_AdditionsToContingencyFromBusinessAcquisitions / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (5,487)cbz_AdditionsToContingencyFromBusinessAcquisitions / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Payment of contingent purchase price payable | 5,230 cbz_PaymentOfContingentPurchasePricePayable / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 11,511 cbz_PaymentOfContingentPurchasePricePayable / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Change in fair value of contingency | 6,080 cbz_ChangeInFairValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (1,102)cbz_ChangeInFairValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Change in net present value of contingency | (129)cbz_ChangeInNetPresentValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (106)cbz_ChangeInNetPresentValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Ending balance | $ 33,368 cbz_ContingentPurchasePriceLiabilitiesAtFairValue / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ (25,196)cbz_ContingentPurchasePriceLiabilitiesAtFairValue / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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

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