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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Corporate and municipal bonds	$ 55.7	$ 49.5
Maturity dates of bonds, start date	2019-01
Maturity dates of bonds, end date	2024-02

X

- Definition

Corporate and municipal bonds net par value.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maturity date of bond end date.

+ References

No definition available.

+ Details

Name:	cbz_MaturityDateOfBondEndDate
Namespace Prefix:	cbz_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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- Definition

Maturity date of bond start date.

+ References

No definition available.

+ Details

Name:	cbz_MaturityDateOfBondStartDate
Namespace Prefix:	cbz_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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