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Financial Instruments - Summary of Outstanding Interest Rate Swap (Parenthetical) (Detail) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivatives, Fair Value [Line Items] |  |
Interest rate swap, description of interest received | Interest that varied with the three-month LIBOR |
Interest rate swap, fixed interest rate | 1.41%us-gaap_DerivativeFixedInterestRate | 1.41%us-gaap_DerivativeFixedInterestRate
June 2015 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value | $ 25,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FinancialInstrumentAxis = cbz_JuneTwoThousandFifteenMember | $ 25,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FinancialInstrumentAxis = cbz_JuneTwoThousandFifteenMember
Interest rate swap, expiration date | 2015-06 | 2015-06

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- Definition Derivative Floating Interest Rate Description + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Derivative maturity month and year. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Details
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