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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liability (Detail) (Level 3 [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance     $ (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Ending balance (32,318)cbz_ContingentPurchasePriceLiabilitiesAtFairValue   (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
Contingent Purchase Price Payable [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (25,196)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Additions from business acquisitions (4,186)cbz_AdditionsToContingencyFromBusinessAcquisitions
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (10,191)cbz_AdditionsToContingencyFromBusinessAcquisitions
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Settlement of contingent purchase price liabilities 3,829cbz_PaymentOfContingentPurchasePricePayable
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 1,494cbz_PaymentOfContingentPurchasePricePayable
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Change in fair value of contingencies 1,445cbz_ChangeInFairValueOfContingency
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 959cbz_ChangeInFairValueOfContingency
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Change in net present value of contingencies (38)cbz_ChangeInNetPresentValueOfContingency
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (19)cbz_ChangeInNetPresentValueOfContingency
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Ending balance $ (32,318)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ (32,953)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByAssetClassAxis
= cbz_ContingentPurchasePricePayableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member