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Fair Value Measurements (Details 1) (Level 3 [Member], USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Contingent Purchase Price Payable [Member] | Mar. 31, 2012 Contingent Purchase Price Payable [Member]
Change in fair values of assets and liabilities identified as level 3 |  |  |  |
Beginning balance | $ (29,951) | $ (30,012) | $ (30,012) | $ (25,325)
Additions from business acquisitions |  |  |  | (1,088)
Payment of contingent purchase price liabilities |  |  | 980 | 1,692
Change in fair value of contingencies |  |  | (887) | 259
Change in net present value of contingencies |  |  | (32) | (54)
Ending balance | $ (29,951) | $ (30,012) | $ (29,951) | $ (24,516)

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- Definition Change in fair value of contingency. + References No definition available. + Details
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- Definition Change in net present value of contingency. + References No definition available. + Details
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Balance Type: | credit
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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
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- Definition Payment of contingent purchase price payable. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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