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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	$ 384,697us-gaap_Goodwill	$ 375,122us-gaap_Goodwill
Additions	52,071us-gaap_GoodwillAcquiredDuringPeriod	9,575us-gaap_GoodwillAcquiredDuringPeriod
Divestitures	(1,537)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Goodwill	435,231us-gaap_Goodwill	384,697us-gaap_Goodwill
Financial Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	260,715us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember	259,038us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Additions	9,452us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember	1,677us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Divestitures	(1,537)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Goodwill	268,630us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember	260,715us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_FinancialServicesMember
Employee Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	122,316us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember	114,418us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Additions	42,619us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember	7,898us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
Goodwill	164,935us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember	122,316us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_EmployeeServicesMember
National Practices [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill			1,666us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember
Goodwill	$ 1,666us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember	$ 1,666us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cbz_NationalPracticesMember	$ 1,666us-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



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-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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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

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 50

-Paragraph 1

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