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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014
Fair Value Measurements, Inter-transfers between Levels | $ 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
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration