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Fair Value Measurements - Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
2006 Convertible Senior Subordinated Notes [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Carrying Value	$ 750	$ 750
Fair Value	$ 750	750
2010 Convertible Senior Subordinated Notes [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Carrying Value		95,819
Fair Value		$ 118,157

X

- Definition

Fair Value Assets Measured On Recurring Basis Unobservable Input.

+ References

No definition available.

+ Details

Name:	cbz_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputLineItems
Namespace Prefix:	cbz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cbz_TwoThousandAndSixConvertibleSeniorSubordinatedNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cbz_TwoThousandAndTenConvertibleSeniorSubordinatedNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: