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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 01, 2015 | Jan. 01, 2014 | Feb. 01, 2014 | Dec. 31, 2014
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Contingent consideration | $ 4,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |  |
Goodwill | 442,276,000 us-gaap_Goodwill |  |  |  |  | 435,231,000 us-gaap_Goodwill
Fair value of contingent consideration | 1,500,000 cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment | 1,000,000 cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment |  |  |  |
Consideration paid in cash | 3,300,000 us-gaap_PaymentsForPreviousAcquisition | 1,500,000 us-gaap_PaymentsForPreviousAcquisition |  |  |  |
Number of common stock issued | 59,000 cbz_NumberOfCommonSharesIssued |  |  |  |  |
Contingent Purchase Price Liability Current [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Contingent consideration | 1,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_CurrentContingentPurchasePriceLiabilityMember |  |  |  |  |
Contingent Purchase Price Liability Non-current [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Contingent consideration | 2,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_NonCurrentContingentPurchasePriceLiabilityMember |  |  |  |  |
Model Consulting, Inc [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Consideration paid in cash | 5,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember |  |  |  |  |
Number of businesses acquired | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember |  |  |  |  |
Contingent consideration | 4,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember |  |  |  |  |
Annual revenue |  |  | 4,200,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember |  |  |
Acquired entity, name |  |  | Model Consulting, Inc |  |  |
Effective date of acquisition | Mar. 01, 2015 |  |  |  |  |
Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Consideration paid in cash |  | 16,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |  |  |
Number of businesses acquired |  | 3 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |  |  |
Contingent consideration |  | 10,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |  |  |
Consideration paid in common stock |  | 1,900,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |  |  |
Goodwill | 6,865,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember | 20,610,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  |  |  |
Clearview National Partners, L.L.C [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Acquired entity, name |  |  |  | Clearview National Partners, LLC |  |
Effective date of acquisition | Jan. 01, 2014 |  |  |  |  |
Clearview National Partners, L.L.C [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Number of employees covered |  |  |  | 100 us-gaap_DefinedContributionPlanNumberOfEmployeesCovered / us-gaap_BusinessAcquisitionAxis = cbz_ClearviewNationalPartnersLlcMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Centric Insurance Agency [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Acquired entity, name |  |  |  | Centric Insurance Agency |  |
Effective date of acquisition | Jan. 01, 2014 |  |  |  |  |
Lewis Birch & Richardo, LLC [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Acquired entity, name |  |  |  |  | Lewis Birch & Richardo, LLC |
Effective date of acquisition | Feb. 01, 2014 |  |  |  |  |
Acquisition of Client Lists [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Consideration paid in cash | 100,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember |  |  |  |  |
Guaranteed future consideration | 300,000 cbz_BusinessAcquisitionCostOfAcquiredEntityGuaranteedFutureConsideration / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember |  |  |  |  |
Employee Services [Member] | Acquisition of Client Lists [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Number of client list purchased | 2 cbz_ClientListPurchased / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cbz_EmployeeServicesMember |  |  |  |  |
Employee Services [Member] | Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill | 6,900,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 11,700,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember |  |  |  |
Financial Services [Member] | Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill |  | $ 8,900,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember |  |  |  |

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