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Fair Value Measurements - Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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2006 Convertible Senior Subordinated Notes [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Carrying Value | $ 750 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember | $ 750 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember
Fair Value | 750 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember | 750 us-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 | 96,415 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | 95,819 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember
Fair Value | $ 124,477 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | $ 118,157 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember

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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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