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v2.4.0.8

Fair Value Measurements - Additional Information (Detail) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Fair Value Measurements, Inter-transfers between Levels | $ 0 | $ 0
Minimum [Member] |  |
Business Combination Contingent Consideration Liability Extended Term | 3 years |
Maximum [Member] |  |
Business Combination Contingent Consideration Liability Extended Term | 6 years |

X
- Definition Business combination contingent consideration liability extended term. + References No definition available. + Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value measurements inter transfers between levels. + References No definition available. + Details
Name: | cbz_FairValueMeasurementsInterTransfersBetweenLevels
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration