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Revenue - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
Revenue Recognition And Deferred Revenue [Abstract]
Capitalized contract period	one year or less
Performance obligations period	one year or less

X

- Definition

Capitalized contract period.

+ References

No definition available.

+ Details

Name:	cbz_CapitalizedContractPeriod
Namespace Prefix:	cbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Performance obligations period.

+ References

No definition available.

+ Details

Name:	cbz_PerformanceObligationsPeriod
Namespace Prefix:	cbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAndDeferredRevenueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration