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Consolidation and Integration Reserve - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Collaboration Arrangement Disclosure [Abstract] |  |  |
Lease consolidation and abandonment | $ 642 | $ 750 | $ 800

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

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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
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration