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Debt and Financing Arrangements - Summary of Carrying Amount of Debt and Equity Components (Detail) (2010 Convertible Senior Subordinated Notes [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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2010 Convertible Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount of notes | $ 97,650 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | $ 97,650 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember
Unamortized discount | (1,235)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | (1,831)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember
Net carrying amount | $ 96,415 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | $ 95,819 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant