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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
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Ending balance | $ (25,196) | $ (30,012)
Contingent Purchase Price Payable [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | (30,012) | (25,325)
Additions from business acquisitions | (5,487) | (17,611)
Payment of contingent purchase price payable | 11,511 | 11,970
Change in fair value of contingencies | (1,102) | 1,135
Change in net present value of contingencies | (106) | (181)
Ending balance | $ (25,196) | $ (30,012)

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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

X
- 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

X
- 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

X
- 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

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