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Debt 8.0% Note (Details) (Long-term Debt [Member], Senior secured notes due May 15, 2014 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Long-term Debt [Member] | Senior secured notes due May 15, 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Secured Long-term Debt, Noncurrent	$ 0us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember	$ 0us-gaap_SecuredLongTermDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorSecuredNotesDueMay152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

X

- Details

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

X

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant