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Borrowing Arrangements - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 28, 2014 Bank | Dec. 31, 2014 Debt | Sep. 27, 2010 | May 30, 2006 | Dec. 31, 2013 | Jun. 01, 2011 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Primary debt arrangements |  | 2 cbz_NumberOfPrimaryDebtArrangements |  |  |  |  |
Unsecured credit facility | $ 400,000,000 us-gaap_UnsecuredLongTermDebt |  |  |  |  |  |
Group of participating banks | 8 cbz_NumberOfGroupOfParticipatingBanks |  |  |  |  |  |
Outstanding balance under applicable credit facility |  | 107,400,000 us-gaap_LongTermLineOfCredit |  |  | 48,500,000 us-gaap_LongTermLineOfCredit |  |
Approximately available funds under credit facility |  | 185,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |  |  |  |  |
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Outstanding principal amount |  | 97,650,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | 1,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  | 130,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |
Unsecured credit facility |  | 400,000,000 us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |  |
Interest rate on Notes |  | 4.875%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | 4.875%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Convertible Senior Subordinated Notes |  | 130,000,000 us-gaap_ConvertibleSubordinatedDebt / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember | 130,000,000 us-gaap_ConvertibleSubordinatedDebt / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Notes payable terms |  | Semi-annually in arrears on April 1 and October 1 beginning April 1, 2011 |  |  |  |  |
Maturity date of Notes |  |  | Oct. 01, 2015 |  |  |  |
Beginning date of notes |  |  | Jul. 31, 2015 |  |  |  |
Percentage of Common stock |  |  | 135.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Common stock convertible price |  |  | $ 7.41 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Notes, convertible, threshold trading days |  | 30 days |  |  |  |  |
Rate for conversion of notes into common stock |  |  | 134.9255 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Conversion value exceeds principal amount |  |  | 1,000 us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Notes, convertible, terms of conversion feature |  | The holders of the 2010 Notes may convert their 2010 Notes beginning July 31, 2015, or earlier if the market price per share of CBIZ common stock exceeds 135% of the conversion price for at least 20 days during the period of 30 consecutive trading days ending on the final trading day of the preceding quarter. |  |  |  |  |
Percentage of principal amount for calculation of repurchase price |  |  | 100.00%cbz_PercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Shares issued in exchange for partial retirement of debt |  | 1.5 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |  |
Partial Extinguishment of debt |  | 32,400,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |  |
Cash portion of retirement |  | 30,600,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |  |
Amortized discount at annual effective rate |  |  | 7.50%cbz_AmortizedDiscountAtAnnualEffectiveRate / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember |  |  |  |
Discount, period of issuance |  |  | 5 years |  |  |  |
Remaining period for amortization of discount |  | 9 months |  |  |  |  |
2010 Convertible Senior Subordinated Notes [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes, convertible, threshold trading days |  | 20 days |  |  |  |  |
2010 Convertible Senior Subordinated Notes [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion value lesser than principal amount |  |  | 1,000 cbz_DebtInstrumentConvertibleIfConvertedValueLesserThanPrincipal / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Credit Facility With Bank Of America N A [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured credit facility | 275,000,000 us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = cbz_CreditFacilityWithBankOfAmericaMember |  |  |  |  |  |
2006 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Outstanding principal amount |  | 750,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  | 1,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember | 750,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |
Interest rate on Notes |  |  |  | 3.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |  |
Convertible Senior Subordinated Notes |  |  |  | 100,000,000 us-gaap_ConvertibleSubordinatedDebt / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |  |
Notes payable terms |  |  |  | Semi-annually in arrears on each June 1 and December 1. |  |  |
Maturity date of Notes |  | Jun. 01, 2026 |  |  |  |  |
Common stock convertible price |  |  |  | $ 10.63 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |  |
Rate for conversion of notes into common stock |  |  |  | 94.1035 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |  |
Convertible notes retired |  |  | 60,000,000 us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |  |  | 39,300,000 us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember |
2006 Convertible Senior Subordinated Notes [Member] | 2014 Forecast [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible notes retired |  |  |  |  |  |  | $ 750,000 us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_LongtermDebtTypeAxis = cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 + Details
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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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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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