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Schedule 1 - Valuation and Qualifying Accounts (Detail) - Valuation and Qualifying Accounts (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Tax valuation allowance | $ 54,788 | $ 50,312 | $ 47,350
Tax valuation allowance | 5,253 | 4,476 | 2,962
Tax valuation allowance | 0 | 0 | 0
Tax valuation allowance | 0 | 0 | 0
Tax valuation allowance | $ 60,041 | $ 54,788 | $ 50,312

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- Definition Tax valuation allowance additions charged to costs and expenses. + References No definition available. + Details
Name: | cdzi_TaxValuationAllowanceAdditionsChargedToCostsAndExpenses
Namespace Prefix: | cdzi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax valuation allowance additions charged to other accounts. + References No definition available. + Details
Name: | cdzi_TaxValuationAllowanceAdditionsChargedToOtherAccounts
Namespace Prefix: | cdzi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax valuation allowance deductions. + References No definition available. + Details
Name: | cdzi_TaxValuationAllowanceDeductions
Namespace Prefix: | cdzi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant