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Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Measurements, Inter-transfers between Levels | $ 0 cbz_FairValueMeasurementsInterTransfersBetweenLevels | $ 0 cbz_FairValueMeasurementsInterTransfersBetweenLevels
Minimum [Member] |  |
Business Combination Contingent Consideration Liability Extended Term | 2 years |
Maximum [Member] |  |
Business Combination Contingent Consideration Liability Extended Term | 6 years |

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |