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Financial Instruments - Summary of Bond Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value at beginning of period	$ 38,399us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue	$ 30,011us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
Purchases	3,531cbz_FinancialInstrumentsOwnedCorporateDebtPurchases	14,089cbz_FinancialInstrumentsOwnedCorporateDebtPurchases
Sales		(245)cbz_FinancialInstrumentsOwnedCorporateDebtSales
Maturities and calls	(3,704)cbz_FinancialInstrumentsOwnedCorporateDebtMaturitiesAndCalls	(6,426)cbz_FinancialInstrumentsOwnedCorporateDebtMaturitiesAndCalls
Increase in bond premium	(19)cbz_IncreaseDecreaseInBondPremium	1,155cbz_IncreaseDecreaseInBondPremium
Fair market value adjustment	178cbz_FairMarketValueAdjustmentOfBonds	(185)cbz_FairMarketValueAdjustmentOfBonds
Fair value at end of period	$ 38,385us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue	$ 38,399us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue

X

- Definition

Fair market value adjustment of bonds.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Financial instrument maturities and calls of corporate and municipal debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Financial instrument purchases of corporate and municipal debt.

+ References

No definition available.

+ Details

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

X

- Definition

Financial instrument sales of corporate and municipal debt.

+ References

No definition available.

+ Details

Name:	cbz_FinancialInstrumentsOwnedCorporateDebtSales
Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Decrease in bond premium.

+ References

No definition available.

+ Details

Name:	cbz_IncreaseDecreaseInBondPremium
Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

+ Details

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