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Debt 8.0% Note (Details) (Long-term Debt [Member], Senior secured notes due May 15, 2014 [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014
Long-term Debt [Member] | Senior secured notes due May 15, 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Secured Long-term Debt, Noncurrent | $ 0 us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | $ 0 us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

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- Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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Balance Type: | credit
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