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Asset purchase (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 t	Jun. 11, 2012 Carbon Anodes [Member]
Business Acquisition [Line Items]
Assets Acquired		$ 12,500
Century Vlissingen Anode capacity	75,000

X

- Definition

Purchase price for acquisition of a group of assets that do not constitute a business

+ References

No definition available.

+ Details

Name:	cenx_AssetsAcquired
Namespace Prefix:	cenx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	cenx_CenturyVlissingenAnodeCapacity
Namespace Prefix:	cenx_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration