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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |  |
Corporate and municipal bonds | $ 40.8 | $ 36.4
Maturity dates of bonds, start date | 2016-01 |
Maturity dates of bonds, end date | 2020-11 |

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- Definition Corporate and municipal bonds par value. + References No definition available. + Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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