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Debt (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Industrial revenue bonds | $ 7,815 cenx_IndustrialRevenueBonds |  | $ 7,815 cenx_IndustrialRevenueBonds |
Current portion of long-term debt | 0 us-gaap_UnsecuredDebtCurrent |  | 2,603 us-gaap_UnsecuredDebtCurrent |
Revolving credit facility | 0 us-gaap_LinesOfCreditCurrent |  | 6,000 us-gaap_LinesOfCreditCurrent |
Debt | 254,703 us-gaap_DebtLongtermAndShorttermCombinedAmount |  | 262,946 us-gaap_DebtLongtermAndShorttermCombinedAmount |
Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Industrial revenue bonds | 7,815 cenx_IndustrialRevenueBonds / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | [1] | 7,815 cenx_IndustrialRevenueBonds / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | [1]
Variable interest rates, maximum (as a percent) | 12.00%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |  | 12.00%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Interest rate (as a percent) | 0.24%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |  |  |
Maturity date | Apr. 01, 2028 |  | Apr. 01, 2028 |
Net of debt discount | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_IndustrialRevenueBondsDue2028Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Senior unsecured notes due August 15, 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member |  |  |
Senior unsecured notes due August 15, 2014 [Member] | Short-term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current portion of long-term debt | 0 us-gaap_UnsecuredDebtCurrent / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | [2],[3] | 2,603 us-gaap_UnsecuredDebtCurrent / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Interest rate (as a percent) | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |  | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Maturity date | Aug. 15, 2014 |  | Aug. 15, 2014 |
Net of debt discount | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Iceland revolving credit facility [Member] | Short-term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility | 0 us-gaap_LinesOfCreditCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | [3],[4] | 6,000 us-gaap_LinesOfCreditCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | [3],[4]
Interest rate (as a percent) |  |  | 3.92%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember |
Senior secured notes due June 01, 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member |  |  |
Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent | 246,888 us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  | 246,528 us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Interest rate (as a percent) | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Maturity date | Jun. 01, 2021 |  | Jun. 01, 2021 |
Net of debt discount | $ 3,112 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  | $ 3,472 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
[1] | The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at December 31, 2014 was 0.24%.
[2] | The amount outstanding was repaid upon maturity.
[3] | These items are recorded in accrued and other current liabilities based on the repayment terms and expected maturity.
[4] | Borrowings under the Iceland revolving credit facility bear variable interest based on LIBOR plus the applicable margin per annum. The interest rate at December 31, 2013 was 3.92%.

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- Definition Carrying value as of the balance sheet date of the long-term debt associated with industrial revenue bonds. For classified balance sheets, these bonds are considered current assets because they are remarketed weekly and the bonds could be required to be repaid upon demand if there is a failed remarketing. + References No definition available. + Details
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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.5-02.20) -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 19, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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