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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at statutory rate (35%) |  |  |  |  |  |  |  |  | $ 17,699 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 14,684 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 13,355 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes (net of federal benefit) |  |  |  |  |  |  |  |  | 3,361 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,020 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 970 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Business meals and entertainment - non-deductible |  |  |  |  |  |  |  |  | 667 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 624 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 674 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Reserves for uncertain tax positions |  |  |  |  |  |  |  |  | (1,724)cbz_IncomeTaxReconciliationReservesForUncertainTaxPositions | (531)cbz_IncomeTaxReconciliationReservesForUncertainTaxPositions | (432)cbz_IncomeTaxReconciliationReservesForUncertainTaxPositions
Other, net |  |  |  |  |  |  |  |  | 151 us-gaap_IncomeTaxReconciliationOtherAdjustments | (220)us-gaap_IncomeTaxReconciliationOtherAdjustments | (203)us-gaap_IncomeTaxReconciliationOtherAdjustments
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
Effective income tax rate |  |  |  |  |  |  |  |  | 39.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 37.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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