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Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
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