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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Parenthetical) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |
Stock based awards excluded from the calculation of diluted earnings per share | 0.9 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 6.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 8.2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Dilutive impact of potential shares average share price | $ 8.71 cbz_AverageMarketPriceOfCommonStock |  |
Dilutive impact of potential shares conversion price | $ 7.41 cbz_DilutiveImpactOfPotentialSharesConversionPrice |  |

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- Definition Dilutive Impact Of Potential Shares Conversion Price + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Details
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