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New Accounting Pronouncements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Adjusted Earnings Before Interest Taxes Depreciation And Amortization And Other Non Cash Items [Abstract]
Unamortized debt issue costs	$ 1.2us-gaap_UnamortizedDebtIssuanceExpense

X

- Details

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Namespace Prefix:	cbz_
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Period Type:	duration

X

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant