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Debt Credit Facility (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Long-term Debt [Member] | U.S revolving credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Line of Credit Facility, Remaining Borrowing Capacity | 38,617 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Line of Credit Facility, Amount Outstanding | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_DomesticLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Long-term Debt [Member] | U.S. letter of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line Of Credit Facility Additional Borrowings Under Letter Of Credit Sub Facility Amount | 130,000 cenx_LineOfCreditFacilityAdditionalBorrowingsUnderLetterOfCreditSubFacility1 / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1]
Line Of Credit Facility Additional Borrowings Under Letter Of Credit Sub Facility Original Amount | 80,000 cenx_LineOfCreditFacilityAdditionalBorrowingsUnderLetterOfCreditSubFacilityOriginalAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1]
Line Of Credit Facility Additional Borrowings Under Letter Of Credit Sub Facility Future Amended Amount | 100,000 cenx_LineOfCreditFacilityAdditionalBorrowingsUnderLetterOfCreditSubFacilityFutureAmendedAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1]
Outstanding letters of credit issued under the revolving credit facility | 111,383 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Long-term Debt [Member] | Iceland revolving credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 50,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Line of Credit Facility, Amount Outstanding | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Line of Credit Facility, Prepayment terms | Grundartangi may, by giving no less than five business days prior written notice to Landsbankinn, prepay any outstanding borrowings without penalty or premium (except incurred breakage costs) in whole or in part. |
Line of Credit Facility, Current Borrowing Capacity | $ 49,940 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
U.S revolving credit facility [Member] | Long-term Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facility, term (in years) | 5 years |
Short-term Debt [Member] | Iceland revolving credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facility, term (in years) | 3 years |
[1] | In connection with the acquisition of Mt. Holly, the U.S. revolving credit facility was amended to increase the letter of credit sub-facility from $80,000 to $100,000. On December 1, 2014, we entered into an additional amendment to the U.S. revolving credit facility, increasing our letter of credit sub-facility to $130,000 for the period from December 1, 2014 through March 1, 2015.

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- Definition The amount of additional borrowings provided in credit facility under a letter of credit sub-facility. + References No definition available. + Details
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Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The future amount of additional borrowings provided in credit facility under a letter of credit sub-facility. + References No definition available. + Details
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Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The original amount of additional borrowings provided in credit facility under a letter of credit sub-facility. + References No definition available. + Details
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Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Details
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Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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