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Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Revenue | $ 213,866 us-gaap_Revenues | $ 204,726 us-gaap_Revenues
Operating expenses | 170,864 us-gaap_CostOfRevenue | 161,938 us-gaap_CostOfRevenue
Gross margin | 43,002 us-gaap_GrossProfit | 42,788 us-gaap_GrossProfit
Corporate general & admin | 9,865 us-gaap_GeneralAndAdministrativeExpense | 10,198 us-gaap_GeneralAndAdministrativeExpense
Operating income (loss) | 33,137 us-gaap_OperatingIncomeLoss | 32,590 us-gaap_OperatingIncomeLoss
Other income (expense): |  |
Interest expense | (2,977)us-gaap_InterestExpense | (3,433)us-gaap_InterestExpense
Gain on sale of operations, net | 56 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 8 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Other income, net | 2,859 us-gaap_OtherNonoperatingIncomeExpense | 1,975 us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) | (62)us-gaap_NonoperatingIncomeExpense | (1,450)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income tax expense | 33,075 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 31,140 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Financial Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 143,832 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 141,238 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Operating expenses | 108,618 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 105,762 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Gross margin | 35,214 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 35,476 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Operating income (loss) | 35,214 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 35,476 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Other income (expense): |  |
Other income, net | 99 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 99 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Total other income (expense) | 99 us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 99 us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Income (loss) from continuing operations before income tax expense | 35,313 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 35,575 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Employee Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 62,651 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 56,109 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Operating expenses | 51,528 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 45,735 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Gross margin | 11,123 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 10,374 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Operating income (loss) | 11,123 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 10,374 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Other income (expense): |  |
Interest expense | (9)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | (8)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Other income, net | 117 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 286 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Total other income (expense) | 108 us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 278 us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Income (loss) from continuing operations before income tax expense | 11,231 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 10,652 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
National Practices [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 7,383 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | 7,379 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Operating expenses | 6,601 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | 6,634 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Gross margin | 782 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | 745 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Operating income (loss) | 782 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | 745 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Other income (expense): |  |
Income (loss) from continuing operations before income tax expense | 782 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | 745 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating expenses | 4,117 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 3,807 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Gross margin | (4,117)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (3,807)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Corporate general & admin | 9,865 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 10,198 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Operating income (loss) | (13,982)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (14,005)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Other income (expense): |  |
Interest expense | (2,968)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (3,425)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Gain on sale of operations, net | 56 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 8 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Other income, net | 2,643 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 1,590 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Total other income (expense) | (269)us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (1,827)us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Income (loss) from continuing operations before income tax expense | $ (14,251)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ (15,832)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

X
- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 + Details
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