XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.19.1

New Accounting Pronouncements - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Operating lease, Percentage of office facilities | 96.00%
ASU 2018-02 [Member] |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Reclassification between AOCI and retained earnings | $ 0.1

X
- Definition Percentage of office facilities in operating lease. + References No definition available. + Details
Name: | cbz_PercentageOfOfficeFacilitiesInOperatingLease
Namespace Prefix: | cbz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=cbz_AccountingStandardsUpdate201802Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |