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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Business Acquisition [Line Items] |  |  |
Goodwill | $ 435,231 us-gaap_Goodwill | $ 384,697 us-gaap_Goodwill | $ 375,122 us-gaap_Goodwill
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Tegrit Group (Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 1,381 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Accounts receivable, net | 4,204 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Other assets | 464 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Identifiable intangible assets | 17,952 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Accounts payable | (3,319)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Accrued liabilities | (3,513)cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Income taxes payable | (1,058)cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesPayable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Deferred tax liability | (1,834)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Total identifiable net assets | 14,277 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Goodwill | 51,873 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Aggregate purchase price | 66,150 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionOneMember |  |
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | 202 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Accounts receivable, net |  | 578 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Other assets |  | 137 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Identifiable intangible assets |  | 3,002 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Accounts payable |  | (835)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Accrued liabilities |  | (416)cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Deferred tax liability |  | (1,165)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Total identifiable net assets |  | 1,503 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Goodwill |  | 9,278 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Aggregate purchase price |  | 10,781 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 422 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Funds held for clients |  |  | 39,193 cbz_BusinessAcquisitionPurchasePriceAllocationFundsHeldForClients / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Accounts receivable, net |  |  | 7,618 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Fixed assets and other |  |  | 1,300 cbz_BusinessAcquisitionPurchasePriceAllocationFixedAssets / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Identifiable intangible assets |  |  | 39,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Accrued liabilities |  |  | (5,113)cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Client fund obligations |  |  | (39,193)cbz_BusinessAcquisitionPurchasePriceAllocationClientFundObligations / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Deferred tax liability |  |  | (1,236)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Total identifiable net assets |  |  | 42,291 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Goodwill |  |  | 57,190 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember
Aggregate purchase price |  |  | $ 99,481 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionThreeMember

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