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Financial Instruments - Summary of Outstanding Interest Rate Swap (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Derivatives, Fair Value [Line Items] |  |
Interest at a fixed rate | 1.41% | 1.41%
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value | $ 40,000 | $ 40,000
Interest rate swap description | Interest that various with the three-month LIBOR | Interest that various with the three-month LIBOR
June 2014 [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value | 15,000 | 15,000
Interest rate swap expiration date | 2014-06 | 2014-06
June 2015 [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value | $ 25,000 | $ 25,000
Interest rate swap expiration date | 2015-06 | 2015-06

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- Definition Derivative maturity month and year. + 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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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DerivativeDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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=7476318&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=7476318&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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration