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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Corporate and municipal bonds	$ 50.0	$ 42.4
Maturity dates of bonds, start date	2017-07
Maturity dates of bonds, end date	2022-05

X

- Definition

Corporate and municipal bonds par value.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbz_
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X

- Definition

Maturity date of bond end date.

+ References

No definition available.

+ Details

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

X

- 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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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