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Financial Instruments - Summary of Bond Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Fair value at beginning of period | $ 30,011 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue | $ 29,776 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
Purchases | 14,089 cbz_FinancialInstrumentsOwnedCorporateDebtPurchases | 5,650 cbz_FinancialInstrumentsOwnedCorporateDebtPurchases
Sales | (245)cbz_FinancialInstrumentsOwnedCorporateDebtSales | (845)cbz_FinancialInstrumentsOwnedCorporateDebtSales
Maturities and calls | (6,426)cbz_FinancialInstrumentsOwnedCorporateDebtMaturitiesAndCalls | (4,050)cbz_FinancialInstrumentsOwnedCorporateDebtMaturitiesAndCalls
Increase (decrease) in bond premium | 1,155 cbz_IncreaseDecreaseInBondPremium | (270)cbz_IncreaseDecreaseInBondPremium
Fair market value adjustment | (185)cbz_FairMarketValueAdjustmentOfBonds | (250)cbz_FairMarketValueAdjustmentOfBonds
Fair value at end of period | $ 38,399 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue | $ 30,011 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue

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- Definition Fair market value adjustment of bonds. + References No definition available. + Details
Name: | cbz_FairMarketValueAdjustmentOfBonds
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financial instrument maturities and calls of corporate and municipal debt. + References No definition available. + Details
Name: | cbz_FinancialInstrumentsOwnedCorporateDebtMaturitiesAndCalls
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financial instrument purchases of corporate and municipal debt. + References No definition available. + Details
Name: | cbz_FinancialInstrumentsOwnedCorporateDebtPurchases
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant