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Quarterly Information (Unaudited) 2014 Financial Results Overview (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |
Gain on fair value of contingent consideration | $ 7,943 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized |  |  |  |  |  |  | $ 7,943 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized | $ 0 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized | $ 0 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized
Gain on remeasurement of equity investment | 1,318 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  |  |  |  |  |  | 1,318 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Pension charges | 4,964 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 |  |  |  |  |  |  |  |  |
Litigation settlement expense | 2,616 us-gaap_LitigationSettlementExpense | 500 us-gaap_LitigationSettlementExpense |  | 8,400 us-gaap_LitigationSettlementExpense |  |  |  |  |  |
Sebree power contract amortization |  |  | 5,534 cenx_AmortizationofAssumedPowerContract | 16,570 cenx_AmortizationofAssumedPowerContract | 11,720 cenx_AmortizationofAssumedPowerContract | 2,741 cenx_AmortizationofAssumedPowerContract |  | 5,534 cenx_AmortizationofAssumedPowerContract | 31,031 cenx_AmortizationofAssumedPowerContract | 0 cenx_AmortizationofAssumedPowerContract
Increase (Decrease) in litigation reserve |  |  | $ 3,100 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve |  |  |  | $ 2,225 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve |  |  |

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- Definition The aggregate benefit recognized in earnings to allocate the assumed power contract liability in a systematic and rational manner over the contract period. As a noncash benefit, this element is subtracted from net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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X
- Definition Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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