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Income Taxes - Income Tax Expense (Benefit) Included in Consolidated Statements of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:                      
Federal                 $ 15,749us-gaap_CurrentFederalTaxExpenseBenefit $ 13,880us-gaap_CurrentFederalTaxExpenseBenefit $ 13,621us-gaap_CurrentFederalTaxExpenseBenefit
Foreign                 47us-gaap_CurrentForeignTaxExpenseBenefit 47us-gaap_CurrentForeignTaxExpenseBenefit 47us-gaap_CurrentForeignTaxExpenseBenefit
State and local                 1,782us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,311us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,779us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total                 17,578us-gaap_CurrentIncomeTaxExpenseBenefit 16,238us-gaap_CurrentIncomeTaxExpenseBenefit 16,447us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:                      
Federal                 952us-gaap_DeferredFederalIncomeTaxExpenseBenefit (394)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,423)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local                 1,624us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 733us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (660)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total                 2,576us-gaap_DeferredIncomeTaxExpenseBenefit 339us-gaap_DeferredIncomeTaxExpenseBenefit (2,083)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense from continuing operations (2,137)us-gaap_IncomeTaxExpenseBenefit 4,353us-gaap_IncomeTaxExpenseBenefit 4,824us-gaap_IncomeTaxExpenseBenefit 13,114us-gaap_IncomeTaxExpenseBenefit (2,698)us-gaap_IncomeTaxExpenseBenefit 2,707us-gaap_IncomeTaxExpenseBenefit 4,260us-gaap_IncomeTaxExpenseBenefit 12,308us-gaap_IncomeTaxExpenseBenefit 20,154us-gaap_IncomeTaxExpenseBenefit 16,577us-gaap_IncomeTaxExpenseBenefit 14,364us-gaap_IncomeTaxExpenseBenefit
Operations of discontinued operations:                      
Current                 51cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations 3,107cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations 4,590cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations
Deferred                 (222)cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations (653)cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations 361cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations
Total                 (171)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod 2,454us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod 4,951us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Gain on disposal of discontinued operations:                      
Current                 34cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent 49,973cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent 52cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent
Deferred                 0cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred (776)cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred 0cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred
Total                 34us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation 49,197us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation 52us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
Total income tax expense from discontinued operations                 (137)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 51,651us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 5,003us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Total income tax expense                 $ 20,017cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations $ 68,228cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations $ 19,367cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations