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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	$ 4,200,000us-gaap_BusinessCombinationContingentConsiderationLiability
Goodwill	442,276,000us-gaap_Goodwill					435,231,000us-gaap_Goodwill
Fair value of contingent consideration	1,500,000cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment	1,000,000cbz_BusinessCombinationContingentConsiderationLiabilityIncreaseDecreaseAdjustment
Consideration paid in cash	3,300,000us-gaap_PaymentsForPreviousAcquisition	1,500,000us-gaap_PaymentsForPreviousAcquisition
Number of common stock issued	59,000cbz_NumberOfCommonSharesIssued
Contingent Purchase Price Liability Current [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration	1,600,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_CurrentContingentPurchasePriceLiabilityMember
Contingent Purchase Price Liability Non-current [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration	2,600,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BalanceSheetLocationAxis = cbz_NonCurrentContingentPurchasePriceLiabilityMember
Model Consulting, Inc [Member]
Business Acquisition, Contingent Consideration [Line Items]
Consideration paid in cash	5,500,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember
Number of businesses acquired	1us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember
Contingent consideration	4,200,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_ModelConsultingIncMember
Annual revenue			4,200,000us-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		16,500,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Number of businesses acquired		3us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Contingent consideration		10,200,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Consideration paid in common stock		1,900,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Goodwill	6,865,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember	20,610,000us-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				100us-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	100,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cbz_AcquisitionOfClientListsMember
Guaranteed future consideration	300,000cbz_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	2cbz_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	6,900,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember	11,700,000us-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		$ 8,900,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember

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