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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 |  |  |
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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 | 3 cbz_NumberOfPracticeGroups |  |  |  |  |  |
Payment for acquisition of common stock | $ 28,137,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 26,468,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 5,716,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |
Fees earned under administrative service agreement | 132,200,000 us-gaap_FeesAndCommissions | 133,500,000 us-gaap_FeesAndCommissions | 109,400,000 us-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 | 487,000,000 us-gaap_EmployeeBenefitsAndShareBasedCompensation | 459,800,000 us-gaap_EmployeeBenefitsAndShareBasedCompensation | 417,900,000 us-gaap_EmployeeBenefitsAndShareBasedCompensation |  |  |  |
Total occupancy costs | 37,100,000 us-gaap_OccupancyCosts | 36,000,000 us-gaap_OccupancyCosts | 34,900,000 us-gaap_OccupancyCosts |  |  |  |
Shares vesting term | 4 years |  |  |  |  |  |
Unrecognized tax benefits | 4,591,000 us-gaap_UnrecognizedTaxBenefits | 5,508,000 us-gaap_UnrecognizedTaxBenefits | 3,618,000 us-gaap_UnrecognizedTaxBenefits |  | 1,200,000 us-gaap_UnrecognizedTaxBenefits | 3,979,000 us-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 |  |  |  | 201,600,000 cbz_DisposalGroupBusinessTransferredAmountUnderContractualArrangement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  | 201,600,000 cbz_DisposalGroupBusinessTransferredAmountUnderContractualArrangement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember
Number of shares purchased from Westbury |  |  |  | 3.9 us-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 |  |  |  | $ 6.65 us-gaap_SaleOfStockPricePerShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  |
Payment for acquisition of common stock |  |  |  | $ 25,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |  |  |

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