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Common Stock - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 30, 2013 | Jul. 01, 2013 | Sep. 27, 2010 | Sep. 14, 2010
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized | 250,000,000 us-gaap_CommonStockSharesAuthorized | 250,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |
Common stock voting rights | One vote for each share held on all matters submitted to a vote of stockholders. There are no cumulative voting rights with respect to the election of directors. |  |  |  |  |  |
Senior leverage ratio | 3.0 cbz_SeniorLeverageRatio |  |  |  |  |  |
Share repurchase program, description | Under CBIZ's credit facility (described in Note 8) share repurchases are unlimited when total leverage is less than 3.0. When leverage is greater than 3.0, the annual share repurchase is limited to $25.0 million. |  |  |  |  |  |
Stock repurchase program authorized to be repurchased | 3,200,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased | 0 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased | 1,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |
Payment for acquisition of treasury stock | $ 28,137,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 26,468,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 5,716,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Shares issued in exchange for partial retirement of debt | 1,500,000 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 |  |  |  |  |  |
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 |
Maximum [Member] |  |  |  |  |  |  |
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Annual share repurchase limit | 25,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Westbury Agreement [Member] |  |  |  |  |  |  |
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value | $ 7.25 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |  |  |  |
Stock repurchase program authorized to be repurchased |  |  |  |  |  |  | 7,700,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
MMP [Member] |  |  |  |  |  |  |
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Percentage of Holding |  |  |  | 50.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  |
Common stock, per share amount |  |  |  | $ 6.65 us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  |
Payment for acquisition of treasury stock |  |  |  | 25,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  |
MMP [Member] | Westbury Agreement [Member] |  |  |  |  |  |  |
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized to be repurchased |  | 3,900,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |  |  |
Percentage of Holding |  | 50.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  | 50.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |
Common stock, per share amount |  | $ 6.65 us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  | $ 6.65 us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |
Payment for acquisition of treasury stock |  | $ 25,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  | $ 25,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |
Number of days moving average share price calculation |  |  |  | 60 days | 60 days |  |

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