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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
Business Acquisition [Line Items]      
Goodwill $ 435,231us-gaap_Goodwill $ 384,697us-gaap_Goodwill $ 375,122us-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 1,381us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionOneMember
   
Accounts receivable, net 4,204us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionOneMember
   
Other assets 464us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionOneMember
   
Identifiable intangible assets 17,952us-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 14,277us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionOneMember
   
Goodwill 51,873us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionOneMember
   
Aggregate purchase price 66,150us-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   202us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionTwoMember
 
Accounts receivable, net   578us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionTwoMember
 
Other assets   137us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionTwoMember
 
Identifiable intangible assets   3,002us-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   1,503us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionTwoMember
 
Goodwill   9,278us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionTwoMember
 
Aggregate purchase price   10,781us-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     422us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Funds held for clients     39,193cbz_BusinessAcquisitionPurchasePriceAllocationFundsHeldForClients
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Accounts receivable, net     7,618us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Fixed assets and other     1,300cbz_BusinessAcquisitionPurchasePriceAllocationFixedAssets
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Identifiable intangible assets     39,300us-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     42,291us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Goodwill     57,190us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember
Aggregate purchase price     $ 99,481us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cbz_SeriesOfBusinessAcquisitionThreeMember