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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014 Practice_Groups	Dec. 31, 2013	Dec. 31, 2012	Aug. 30, 2013	Jan. 01, 2014	Dec. 31, 2011	Jul. 26, 2013
Summary Of Significant Accounting Policies [Line Items]
Number of practice groups	3cbz_NumberOfPracticeGroups
Payment for acquisition of common stock	$ 28,137,000us-gaap_PaymentsForRepurchaseOfCommonStock	$ 26,468,000us-gaap_PaymentsForRepurchaseOfCommonStock	$ 5,716,000us-gaap_PaymentsForRepurchaseOfCommonStock
Fees earned under administrative service agreement	132,200,000us-gaap_FeesAndCommissions	133,500,000us-gaap_FeesAndCommissions	109,400,000us-gaap_FeesAndCommissions
Maximum maturity period of investments	3 years
Intangible assets amortization period	8 years 4 months 24 days
Software purchased or developed, estimated useful life	7 years
Contract payment terms	90 days
Total personnel costs	487,000,000us-gaap_EmployeeBenefitsAndShareBasedCompensation	459,800,000us-gaap_EmployeeBenefitsAndShareBasedCompensation	417,900,000us-gaap_EmployeeBenefitsAndShareBasedCompensation
Total occupancy costs	37,100,000us-gaap_OccupancyCosts	36,000,000us-gaap_OccupancyCosts	34,900,000us-gaap_OccupancyCosts
Shares vesting term	4 years
Unrecognized tax benefits	4,591,000us-gaap_UnrecognizedTaxBenefits	5,508,000us-gaap_UnrecognizedTaxBenefits	3,618,000us-gaap_UnrecognizedTaxBenefits		1,200,000us-gaap_UnrecognizedTaxBenefits	3,979,000us-gaap_UnrecognizedTaxBenefits
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	2 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	15 years
MMP [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate Purchase price consideration paid during transaction				201,600,000cbz_DisposalGroupBusinessTransferredAmountUnderContractualArrangement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember			201,600,000cbz_DisposalGroupBusinessTransferredAmountUnderContractualArrangement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember
Number of shares purchased from Westbury				3.9us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember
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 common stock				$ 25,700,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember

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Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

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