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Supplemental Cash Flow Disclosures - Cash Paid for Interest and Income Taxes (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items] |  |  |
Income taxes | $ 18,277 us-gaap_IncomeTaxesPaidNet | $ 67,941 us-gaap_IncomeTaxesPaidNet | $ 12,902 us-gaap_IncomeTaxesPaidNet
MMP [Member] |  |  |
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items] |  |  |
Income taxes |  | $ 47,500 us-gaap_IncomeTaxesPaidNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cbz_MedicalManagementProfessionalsBusinessMember |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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