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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance |  |  | $ (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Ending balance | (32,318)cbz_ContingentPurchasePriceLiabilitiesAtFairValue |  | (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Contingent Purchase Price Payable [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning 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 |
Additions from business acquisitions | (4,186)cbz_AdditionsToContingencyFromBusinessAcquisitions / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (10,191)cbz_AdditionsToContingencyFromBusinessAcquisitions / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Settlement of contingent purchase price liabilities | 3,829 cbz_PaymentOfContingentPurchasePricePayable / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 1,494 cbz_PaymentOfContingentPurchasePricePayable / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Change in fair value of contingencies | 1,445 cbz_ChangeInFairValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 959 cbz_ChangeInFairValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Change in net present value of contingencies | (38)cbz_ChangeInNetPresentValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (19)cbz_ChangeInNetPresentValueOfContingency / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Ending balance | $ (32,318)cbz_ContingentPurchasePriceLiabilitiesAtFairValue / us-gaap_FairValueByAssetClassAxis = cbz_ContingentPurchasePricePayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ (32,953)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
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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
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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