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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	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Stock based awards excluded from the calculation of diluted earnings per share	1.0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Dilutive impact of potential shares average share price	$ 8.74cbz_AverageMarketPriceOfCommonStock	$ 8.98cbz_AverageMarketPriceOfCommonStock
Dilutive impact of potential shares conversion price	$ 7.41cbz_DilutiveImpactOfPotentialSharesConversionPrice

X

- Definition

Average Market Price Of Common Stock

+ References

No definition available.

+ Details

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X

- Definition

Dilutive Impact Of Potential Shares Conversion Price

+ References

No definition available.

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X

- 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

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