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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
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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 |  |  |  |  |  |  |  |  | $ 15,749 us-gaap_CurrentFederalTaxExpenseBenefit | $ 13,880 us-gaap_CurrentFederalTaxExpenseBenefit | $ 13,621 us-gaap_CurrentFederalTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 47 us-gaap_CurrentForeignTaxExpenseBenefit | 47 us-gaap_CurrentForeignTaxExpenseBenefit | 47 us-gaap_CurrentForeignTaxExpenseBenefit
State and local |  |  |  |  |  |  |  |  | 1,782 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,311 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,779 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total |  |  |  |  |  |  |  |  | 17,578 us-gaap_CurrentIncomeTaxExpenseBenefit | 16,238 us-gaap_CurrentIncomeTaxExpenseBenefit | 16,447 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 952 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (394)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (1,423)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local |  |  |  |  |  |  |  |  | 1,624 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 733 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (660)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total |  |  |  |  |  |  |  |  | 2,576 us-gaap_DeferredIncomeTaxExpenseBenefit | 339 us-gaap_DeferredIncomeTaxExpenseBenefit | (2,083)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense from continuing operations | (2,137)us-gaap_IncomeTaxExpenseBenefit | 4,353 us-gaap_IncomeTaxExpenseBenefit | 4,824 us-gaap_IncomeTaxExpenseBenefit | 13,114 us-gaap_IncomeTaxExpenseBenefit | (2,698)us-gaap_IncomeTaxExpenseBenefit | 2,707 us-gaap_IncomeTaxExpenseBenefit | 4,260 us-gaap_IncomeTaxExpenseBenefit | 12,308 us-gaap_IncomeTaxExpenseBenefit | 20,154 us-gaap_IncomeTaxExpenseBenefit | 16,577 us-gaap_IncomeTaxExpenseBenefit | 14,364 us-gaap_IncomeTaxExpenseBenefit
Operations of discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 51 cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations | 3,107 cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations | 4,590 cbz_CurrentIncomeTaxExpenseBenefitDiscontinuedOperations
Deferred |  |  |  |  |  |  |  |  | (222)cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations | (653)cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations | 361 cbz_DeferredIncomeTaxExpenseBenefitDiscontinuedOperations
Total |  |  |  |  |  |  |  |  | (171)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod | 2,454 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod | 4,951 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Gain on disposal of discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 34 cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent | 49,973 cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent | 52 cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationCurrent
Deferred |  |  |  |  |  |  |  |  | 0 cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred | (776)cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred | 0 cbz_DiscontinuedOperationTaxEffectOnGainLossFromDisposalOfDiscontinuedOperationDeferred
Total |  |  |  |  |  |  |  |  | 34 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation | 49,197 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation | 52 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
Total income tax expense from discontinued operations |  |  |  |  |  |  |  |  | (137)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 51,651 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 5,003 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Total income tax expense |  |  |  |  |  |  |  |  | $ 20,017 cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations | $ 68,228 cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations | $ 19,367 cbz_IncomeTaxExpenseBenefitContinuedAndDiscontinuedOperations

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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 + Details
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