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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 |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Contingent Purchase Price Payable [Member] | Jun. 30, 2012 Contingent Purchase Price Payable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ (34,254) | $ (30,012) | $ (30,012) | $ (25,325)
Additions from business acquisitions |  |  | (4,566) | (2,528)
Payment of contingent purchase price liabilities |  |  | 1,283 | 1,982
Change in fair value of contingencies |  |  | (904) | 111
Change in net present value of contingencies |  |  | (55) | (104)
Ending balance | $ (34,254) | $ (30,012) | $ (34,254) | $ (25,864)

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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