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Business acquisitions Acquisition of Mt. Holly smelter table (Details) (Mt. Holly Smelter [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended
Dec. 01, 2014
Mar. 31, 2014
Dec. 01, 2014
Mt. Holly Smelter [Member]
     
Consideration:      
Purchase price $ 67,500cenx_BusinessAcquisitionPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  $ 67,500cenx_BusinessAcquisitionPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Pension funding (1) 46,546us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
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= cenx_Mt.HollySmelterMember
[1]    
Contingent consideration 13,780us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  13,780us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Economic, working capital and other closing adjustments (1) (12,324)cenx_BusinessCombinationConsiderationReceivableOther
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
[1]    
Settlement of partnership accounts (23,172)cenx_BusinessCombinationConsiderationReceivable
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
   
Total consideration 92,330us-gaap_BusinessCombinationConsiderationTransferred1
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= cenx_Mt.HollySmelterMember
   
Assets Acquired:      
Inventories 26,105us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  26,105us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Due from Alumax 20,786us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  20,786us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Prepaid and other current assets 2,527us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  2,527us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Intangible asset 2,580us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  2,580us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Pension asset 30,842us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  30,842us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Property, plant and equipment – net 127,089us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  127,089us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Total assets acquired 209,929us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  209,929us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Liabilities Assumed:      
Accounts payable, trade 41,471us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  41,471us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Accrued and other current liabilities 6,045us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  6,045us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Accrued postretirement benefit costs 2,857cenx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPostRetirementBenefits
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  2,857cenx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPostRetirementBenefits
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Asset retirement obligations 10,503us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  10,503us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Deferred taxes 4,804us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  4,804us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Total liabilities assumed 65,680us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  65,680us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Goodwill 4,804us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  4,804us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
Pro forma information      
Pro forma revenues   474,155us-gaap_BusinessAcquisitionsProFormaRevenue
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Pro forma earnings (loss) from continuing operations   (24,217)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
 
Pro forma earnings (loss) per common share, basic (in dollars per share)   $ (0.27)us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
 
Pro forma earnings (loss) per common share, diluted (in dollars per share)   $ (0.27)us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
 
Alumina Supply Agreements $ 14,880us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
  $ 14,880us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized
/ us-gaap_BusinessAcquisitionAxis
= cenx_Mt.HollySmelterMember
[1] While there were no additional acquisition-related payments in the first quarter of 2015, subsequent to the quarter end, we paid an additional payment of $38,162 primarily related to pension funding obligations, final economic adjustment, working capital and other adjustments, net of certain amounts owed by Alumax to Mt. Holly.