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Earnings Per Share - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Line Items] |
Average annual market price | $ 8.71 cbz_AverageMarketPriceOfCommonStock
2006 Notes [Member] |
Earnings Per Share [Line Items] |
Conversion price of debt issued | $ 10.63 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandSixNotesMember
2010 Notes [Member] |
Earnings Per Share [Line Items] |
Conversion price of debt issued | $ 7.41 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandTenNotesMember

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- Definition Average Market Price Of Common Stock + References No definition available. + Details
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Namespace Prefix: | cbz_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cbz_TwoThousandTenNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |