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