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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 384,697 us-gaap_Goodwill | $ 375,122 us-gaap_Goodwill |
Additions | 52,071 us-gaap_GoodwillAcquiredDuringPeriod | 9,575 us-gaap_GoodwillAcquiredDuringPeriod |
Divestitures | (1,537)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |  |
Goodwill | 435,231 us-gaap_Goodwill | 384,697 us-gaap_Goodwill |
Financial Services [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 260,715 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 259,038 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember |
Additions | 9,452 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 1,677 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember |
Divestitures | (1,537)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember |  |
Goodwill | 268,630 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember | 260,715 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember |
Employee Services [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 122,316 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 114,418 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember |
Additions | 42,619 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 7,898 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember |
Goodwill | 164,935 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember | 122,316 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember |
National Practices [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  |  | 1,666 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Goodwill | $ 1,666 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | $ 1,666 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember | $ 1,666 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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