XML 97 R83.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract] |  |  |
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) 50.00% | 80.00% |  |
Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent) | 50.00% |  |
Percentage of participating employees contribution, matched 100% (as a percent) | 6.00% |  |
Employer contribution | $ 10,400 | $ 9,600 | $ 9,000
Non-qualified deferred gains or (losses) of investment | 12,100 | 5,300 | $ (700)
Non-qualified deferred compensation plan assets | 85,589 | 69,912 |
Non-qualified deferred compensation plan liabilities | $ 85,589 | $ 69,912 |

X
- Definition Defined contribution plan maximum employee contribution percentage. + References No definition available. + Details
Name: | cbz_DefinedContributionPlanMaximumEmployeeContributionPercentage
Namespace Prefix: | cbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan percentage of base compensation. + References No definition available. + Details
Name: | cbz_DefinedContributionPlanPercentageOfBaseCompensation
Namespace Prefix: | cbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non-qualified deferred compensation plan gain loss on investments. + References No definition available. + Details
Name: | cbz_NonQualifiedDeferredCompensationPlanGainLossOnInvestments
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredCompensationPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration