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Consolidation and Integration Reserve - Summary of Consolidation and Integration Reserve (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Collaboration Arrangement Disclosure [Abstract] |  |  |
Consolidation and Integration Reserve, Beginning Balance | $ 1,011 cbz_ConsolidationAndIntegrationReserve | $ 1,264 cbz_ConsolidationAndIntegrationReserve |
Adjustments against income | 478 cbz_ConsolidationAndIntegrationReserveAdjustments | 642 cbz_ConsolidationAndIntegrationReserveAdjustments | 700 cbz_ConsolidationAndIntegrationReserveAdjustments
Payments | (365)cbz_ConsolidationAndIntegrationReservePayments | (895)cbz_ConsolidationAndIntegrationReservePayments |
Consolidation and Integration Reserve, Ending Balance | $ 1,124 cbz_ConsolidationAndIntegrationReserve | $ 1,011 cbz_ConsolidationAndIntegrationReserve | $ 1,264 cbz_ConsolidationAndIntegrationReserve

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- Details
Name: | cbz_CollaborationArrangementDisclosureAbstract
Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Consolidation and integration reserve. + References No definition available. + Details
Name: | cbz_ConsolidationAndIntegrationReserve
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Consolidation and integration reserve adjustments that were recorded to operating expenses during the current period. + References No definition available. + Details
Name: | cbz_ConsolidationAndIntegrationReserveAdjustments
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Consolidation and integration reserve payments that were made during the current period. + References No definition available. + Details
Name: | cbz_ConsolidationAndIntegrationReservePayments
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration