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Commitments and Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 30, 2013 | Sep. 30, 2014 Class_Member | Dec. 31, 2013
Commitments And Contingencies [Line Items] |  |  |
License bonds outstanding amount |  | $ 1,700,000 | $ 2,400,000
Number of class member opted out of settlement before finalization |  | 18 |
Damages sought amount |  | 87,000,000 |
Litigation settlement amount | 0 |  |
Guarantor [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Letters of credit outstanding |  | 1,900,000 | 1,900,000
Ashkenazi [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 92,000,000 |
Victims Recovery [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 53,000,000 |
Marsh Facciola Rader And ML Liquidating Trust [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 200,000,000 |
Rader [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 15,000,000 |
Marsh [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 115,000,000 |
Baldino Group [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | 16,000,000 |
Number of Plaintiffs |  | 2 |
Letters of Credit [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Letters of credit outstanding |  | $ 2,500,000 | $ 2,500,000

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

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- Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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Balance Type: | debit
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration