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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains (losses) on available for sale securities, income tax (benefit) expense	$ (37)cbz_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	$ 37cbz_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Unrealized loss on interest rate swaps, income tax expense (benefit)	$ 47cbz_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnDerivativesArisingDuringPeriodTax	$ 167cbz_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnDerivativesArisingDuringPeriodTax

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- Definition

Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Derivatives Arising During Period Tax

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No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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- Definition

Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax

+ References

No definition available.

+ Details

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

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- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration