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Financial Instruments - Summary of Bond Activity (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value at beginning of period | $ 29,776 | $ 30,923
Purchases | 4,390 | 5,742
Sales | (345) | (2,000)
Maturities and calls | (3,000) | (4,900)
Decrease in bond premium | (154) | (290)
Fair market value adjustment | (295) | 301
Fair value at end of period | $ 30,372 | $ 29,776

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- Definition Fair market value adjustment of bonds. + References No definition available. + Details
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- Definition Financial instrument maturities and calls of corporate and municipal debt. + References No definition available. + Details
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- Definition Financial instrument purchases of corporate and municipal debt. + References No definition available. + Details
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- Definition Financial instrument sales of corporate and municipal debt. + References No definition available. + Details
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Namespace Prefix: | cbz_
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Period Type: | duration

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- Definition Decrease in bond premium. + References No definition available. + Details
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- Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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