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Acquisitions (Change in contingent purchase price liability related to prior acquisitions) - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Business Combinations [Abstract] |  |
Fair value of contingent consideration | $ 3.1 | $ 3.6

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- Definition Business combination contingent consideration liability increase decrease adjustment. + 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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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration