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Related Parties - 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. 14, 2010
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Shares authorized to be repurchased | 3,200,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased | 0 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased | 1,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |
Common stock repurchase price | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |
Payment for acquisition of treasury stock | $ 28,137,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 26,468,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 5,716,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |
Lease paid by company | 34,300,000 us-gaap_LeaseAndRentalExpense | 33,900,000 us-gaap_LeaseAndRentalExpense | 32,200,000 us-gaap_LeaseAndRentalExpense |  |  |
Westbury Agreement [Member] |  |  |  |  |  |
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Purchase of option |  |  |  |  |  | 5,000,000 invest_DerivativeNotionalAmount / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Shares authorized to be repurchased |  |  |  |  |  | 7,700,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Common stock repurchase price | $ 7.25 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |  |  |
MMP [Member] |  |  |  |  |  |
Notes Receivable Related Parties [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] |  |  |  |  |  |
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Shares authorized to be repurchased |  | 3,900,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember |  |  |  |
Repurchase of treasury stock, shares |  |  |  | 3,900,000 cbz_TreasuryStockRepurchasedDuringPeriodShare / 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 |
Date of expiration | Sep. 30, 2013 |  |  |  |  |
Affiliated Entity [Member] | Guarantor [Member] |  |  |  |  |  |
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Amount of letter of credit for CPA firm | 1,900,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_GuaranteesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 1,900,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_GuaranteesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |  |  |
Director [Member] |  |  |  |  |  |
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Lease paid by company | 2,200,000 us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember | 2,100,000 us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember | 2,000,000 us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember |  |  |
Akin Gump [Member] |  |  |  |  |  |
Notes Receivable Related Parties [Line Items] |  |  |  |  |  |
Legal charges paid | $ 600,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember | $ 400,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember | $ 200,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember |  |  |

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