XML 30 R40.htm IDEA: XBRL DOCUMENT
v3.19.3

New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 02, 2019 | Sep. 30, 2019 | Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating lease, Percentage of office facilities | 96.00% | 97.00% |
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=us-gaap_AccountingStandardsUpdate201802Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |