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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 Class_Member | Dec. 31, 2012
Commitments And Contingencies [Line Items] |  |
License bonds outstanding amount | $ 2.0 | $ 2.7
Number of class member opted out of settlement before finalization | 18 |
Damages sought amount | 87 |
Letters of Credit [Member] |  |
Commitments And Contingencies [Line Items] |  |
Letters of credit outstanding | 2.5 | 2.5
Ashkenazi [Member] |  |
Commitments And Contingencies [Line Items] |  |
Damages sought amount | 92 |
Victims Recovery [Member] |  |
Commitments And Contingencies [Line Items] |  |
Damages sought amount | 53 |
Marsh [Member] |  |
Commitments And Contingencies [Line Items] |  |
Damages sought amount | 200 |
Rader [Member] |  |
Commitments And Contingencies [Line Items] |  |
Damages sought amount | 15 |
Guarantor [Member] |  |
Commitments And Contingencies [Line Items] |  |
Letters of credit outstanding | $ 1.9 | $ 1.9

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- Definition Commitment and contingencies number of class members opted out of settlement. + References No definition available. + Details
Name: | cbz_CommitmentAndContingenciesNumberOfClassMembersOptedOutOfSettlement
Namespace Prefix: | cbz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cbz_CommitmentsAndContingenciesLineItems
Namespace Prefix: | cbz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition License bonds outstanding. + References No definition available. + Details
Name: | cbz_LicenseBondsOutstandingAmount
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration