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Financial Instruments (Available-for-sale Debt Securities) - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale securities, debt securities, par value | $ 59.0 | $ 55.7
Available-for-sale debt securities, maturity start date | 2019-08 |
Available-for-sale debt securities, maturity end date | 2024-02 |

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- Definition Available-for-sale securities, debt securities, par value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Debt securities, available-for-sale, maturity end date. + References No definition available. + Details
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- Definition Debt securities, available-for-sale, maturity start date. + References No definition available. + Details
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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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