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Fair Value Measurements - Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
2006 Convertible Senior Subordinated Notes [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Carrying Value $ 750us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember		 $ 750us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember
Fair Value 750us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember		 750us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember
2010 Convertible Senior Subordinated Notes [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Carrying Value 95,819us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember		 124,506us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember
Fair Value $ 118,157us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember		 $ 173,779us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember