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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liability (Detail) - Level 3 [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ (33,368) |
Ending balance | (24,817) | $ (33,368)
Contingent Purchase Price Liabilities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | (33,368) | (25,196)
Additions from business acquisitions | (8,522) | (19,353)
Payment of contingent purchase price payable | 14,364 | 5,230
Change in fair value of contingency | 2,709 | 5,951
Ending balance | $ (24,817) | $ (33,368)

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- Definition Additions to the contingent liability resulting from business acquisitions. + References No definition available. + Details
Name: | cbz_AdditionsToContingencyFromBusinessAcquisitions
Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in fair value of contingency. + References No definition available. + Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contingent purchase price liabilities. + References No definition available. + Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Payment of contingent purchase price payable. + References No definition available. + Details
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Namespace Prefix: | cbz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |