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Asset purchase (Details) (Carbon Anodes Production Facility [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 t | Jun. 11, 2012
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Carbon Anodes Production Facility [Member] |  |
Asset purchase [Line Items] |  |
Assets acquired |  | $ 12,500 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember
Century Vlissingen Anode capacity (tonnes) | 75,000 cenx_CenturyVlissingenAnodeCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember |
Century Vlissingen Expected Anode capacity (tonnes) | 150,000 cenx_CenturyVlissingenExpectedAnodecapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember |

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- Definition The capacity of anode production facility at Century Vlissingen in the Netherlands. + References No definition available. + Details
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- Definition The expected capacity of anode production facility at Century Vlissingen in the Netherlands. + References No definition available. + Details
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- Details
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- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
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