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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	3,200,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Common stock repurchase price	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Payment for acquisition of treasury stock	$ 28,137,000us-gaap_PaymentsForRepurchaseOfCommonStock	$ 26,468,000us-gaap_PaymentsForRepurchaseOfCommonStock	$ 5,716,000us-gaap_PaymentsForRepurchaseOfCommonStock
Lease paid by company	34,300,000us-gaap_LeaseAndRentalExpense	33,900,000us-gaap_LeaseAndRentalExpense	32,200,000us-gaap_LeaseAndRentalExpense
Westbury Agreement [Member]
Notes Receivable Related Parties [Line Items]
Purchase of option						5,000,000invest_DerivativeNotionalAmount / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Shares authorized to be repurchased						7,700,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Common stock repurchase price	$ 7.25us-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				$ 6.65us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember
Payment for acquisition of treasury stock				25,700,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember
MMP [Member] | Westbury Agreement [Member]
Notes Receivable Related Parties [Line Items]
Shares authorized to be repurchased		3,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Repurchase of treasury stock, shares				3,900,000cbz_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		$ 6.65us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember		$ 6.65us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember
Payment for acquisition of treasury stock		25,700,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember / us-gaap_RelatedPartyTransactionAxis = cbz_WestburyAgreementMember		25,700,000us-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	1,900,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_GuaranteesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember	1,900,000us-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	2,200,000us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember	2,100,000us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember	2,000,000us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember
Akin Gump [Member]
Notes Receivable Related Parties [Line Items]
Legal charges paid	$ 600,000us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember	$ 400,000us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember	$ 200,000us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cbz_AkinGumpMember

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