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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 01, 2012
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  |  | $ 2,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability |
Goodwill | 435,231,000 us-gaap_Goodwill | 384,697,000 us-gaap_Goodwill | 375,122,000 us-gaap_Goodwill |
Consideration paid in cash | 4,600,000 us-gaap_PaymentsForPreviousAcquisition | 10,100,000 us-gaap_PaymentsForPreviousAcquisition | 25,600,000 us-gaap_PaymentsForPreviousAcquisition |
Number of common stock issued | 67,000 cbz_NumberOfCommonSharesIssued | 184,000 cbz_NumberOfCommonSharesIssued | 402,000 cbz_NumberOfCommonSharesIssued |
Fair value of contingent consideration | 3,900,000 cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment | 1,100,000 cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment | 1,100,000 cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment |
Common stock issuable |  |  | 41,314 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Tegrit Group (Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent arrangements arising from acquisitions | 20,900,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |  |
Contingent consideration | 19,400,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |  |
Goodwill | 51,873,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |  |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Tegrit Group (Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] | Contingent Purchase Price Liability Current [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration | 5,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_CurrentContingentPurchasePriceLiabilityMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |  |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Tegrit Group (Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] | Contingent Purchase Price Liability Non-current [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration | 14,400,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_NonCurrentContingentPurchasePriceLiabilityMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |  |
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent arrangements arising from acquisitions |  | 6,100,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Contingent consideration |  | 5,500,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Goodwill |  | 9,278,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Consideration paid in cash |  | 4,900,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Number of businesses acquired |  | 2 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Guaranteed future consideration |  | 400,000 cbz_BusinessAcquisitionCostOfAcquiredEntityGuaranteedFutureConsideration / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
CBIZ contingent consideration |  | 5,500,000 cbz_BusinessAcquisitionCostOfAcquiredEntityContingentConsideration / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Goodwill deductible for tax purposes |  | 1,400,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Current [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  | 1,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_CurrentContingentPurchasePriceLiabilityMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Non-current [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  | 4,300,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_NonCurrentContingentPurchasePriceLiabilityMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent arrangements arising from acquisitions |  |  | 18,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Contingent consideration |  |  | 15,400,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Goodwill |  |  | 57,190,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Consideration paid in cash |  |  | 74,200,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Number of businesses acquired |  |  | 8 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Guaranteed future consideration |  |  | 1,700,000 cbz_BusinessAcquisitionCostOfAcquiredEntityGuaranteedFutureConsideration / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Goodwill deductible for tax purposes |  |  | 53,000,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Consideration paid in common stock |  |  | 3,600,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Short-term notes payable |  |  | 4,500,000 cbz_BusinessAcquisitionCostOfAcquiredEntityShortTermNotesIssued / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] | Other Current Liabilities [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  |  | 4,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] | Other Non-current Liabilities [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  |  | 10,800,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember |
Acquisition of Client Lists [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration | 200,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember | 300,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember |  |
Number of client list purchased | 4 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember | 3 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember |  |
Consideration paid in cash | $ 1,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember | $ 300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember |  | $ 2,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember
Employee Services [Member] | Acquisition of Client Lists [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Number of client list purchased | 1 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cbz_EmployeeServicesMember | 2 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cbz_EmployeeServicesMember |  |
Financial Services Practice Group [Member] | Acquisition of Client Lists [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Number of client list purchased | 3 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cbz_FinancialServicesPracticeGroupMember | 1 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cbz_FinancialServicesPracticeGroupMember |  |

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