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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Corporate and municipal bonds $ 38,399us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue $ 30,011us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue $ 29,776us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
Level 1 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Deferred compensation plan assets 60,290us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
51,953us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Corporate and municipal bonds 38,399us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
30,011us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 2 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Interest rate swap (126)us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
(452)us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Level 3 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Contingent purchase price liabilities $ (33,368)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ (25,196)cbz_ContingentPurchasePriceLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member