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Employee Share Plans - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Retirement Plans [Line Items] |  |  |
Holding period of stock | 1 year |  |
Stock awards expiry | 2024 |  |
Fair value of stock options granted | $ 2.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 1.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 1.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Options awarded under the plans vesting period | 4 years |  |
Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Maximum stock based compensation awards granted under the plan | 9.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Compensation cost for non-vested stock options weighted average period | 1 year 3 months 18 days |  |
Unrecognized compensation cost for restricted stock awards | $ 7,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Total fair value of shares vested during period | 3,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Market value of shares awarded during period | 4,100,000 cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3,400,000 cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3,000,000 cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Employee Stock Purchase Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Price an employee pays for shares as percentage of fair market value | 85.00%cbz_EmployeeStockPurchasePlanPurchasePriceOfSharesAsPercentageOfFairMarketValueOfCommonStock / us-gaap_OptionIndexedToIssuersEquityTypeAxis = cbz_EmployeeStockPurchasePlanMember |  |
Termination date of the Employee Stock Purchase Plan | Jun. 30, 2017 |  |
Stock Option [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Percentage of incremental vesting schedule | 25.00%cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 25.00%cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 25.00%cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Incremental vesting schedule period | 4 years |  |
Stock options expire | 6 years |  |
Options awarded under the plans vesting period | 4 years |  |
Percentage of option price to fair market value | 110.00%cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPurchasePriceAsPercentageOfFairValue / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Percentage of voting power of all classes of stock of CBIZ | 10.00%cbz_ShareBasedCompensationShareBasedPaymentsVotingPowerPercentage / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Weighted-average grant-date fair value of stock options granted | 3,000,000 cbz_ShareBasedCompensationArrangementsByShareBasedPaymentsAwardOptionsWeightedAverageFairValueAtTimeOfGrantDate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 3,000,000 cbz_ShareBasedCompensationArrangementsByShareBasedPaymentsAwardOptionsWeightedAverageFairValueAtTimeOfGrantDate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,500,000 cbz_ShareBasedCompensationArrangementsByShareBasedPaymentsAwardOptionsWeightedAverageFairValueAtTimeOfGrantDate / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Aggregate intrinsic value of stock options exercised | 2,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Unrecognized compensation cost for non-vested stock option | 6,500,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Compensation cost for non-vested stock options weighted average period | 1 year 4 months 24 days |  |
2002 Stock Incentive Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Share available for future grant | 0.8 cbz_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForFutureGrant / us-gaap_PlanNameAxis = cbz_TwoThousandTwoStockIncentivePlanMember |  |
Maximum [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Shares purchased under ESPP | 2 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Restricted stock outstanding release from restriction period range | 2015-02 |  |
Maximum [Member] | Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Options awarded under the plans vesting period | 4 years |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
ESPP allows qualified employees to purchase shares of common stock | $ 25,000 cbz_EmployeeStockPurchasePlanSharePurchaseAuthorizedAmount / us-gaap_OptionIndexedToIssuersEquityTypeAxis = cbz_EmployeeStockPurchasePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Restricted stock outstanding release from restriction period range | 2018-05 |  |
Minimum [Member] | Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Options awarded under the plans vesting period | 1 year |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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