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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
Carbon Anodes Production Facility [Member]
Asset purchase [Line Items]
Assets acquired		$ 12,500us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember
Century Vlissingen Anode capacity (tonnes)	75,000cenx_CenturyVlissingenAnodeCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember
Century Vlissingen Expected Anode capacity (tonnes)	150,000cenx_CenturyVlissingenExpectedAnodecapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cenx_CarbonAnodeProductionFacilityMember

X

- Definition

The capacity of anode production facility at Century Vlissingen in the Netherlands.

+ References

No definition available.

+ Details

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X

- Definition

The expected capacity of anode production facility at Century Vlissingen in the Netherlands.

+ References

No definition available.

+ Details

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Namespace Prefix:	cenx_
Data Type:	num:massItemType
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X

- Details

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Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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