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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Net sales to Glencore | $ 1,262,101 us-gaap_RevenueFromRelatedParties | $ 511,051 us-gaap_RevenueFromRelatedParties | $ 552,299 us-gaap_RevenueFromRelatedParties
Glencore [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net sales to Glencore | 1,262,101 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember | 511,051 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember | 552,299 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember
Purchases from Glencore | 285,167 us-gaap_RelatedPartyCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember | 173,693 us-gaap_RelatedPartyCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember | 145,589 us-gaap_RelatedPartyCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cenx_GlencoreMember
Noncontrolling Interest [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases from BHH | $ 47,804 cenx_PurchasesFromBhh / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_NoncontrollingInterestMember | $ 86,678 cenx_PurchasesFromBhh / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_NoncontrollingInterestMember | $ 39,337 cenx_PurchasesFromBhh / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_NoncontrollingInterestMember
BHH [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cenx_BhhMember |  |

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- Definition Direct costs arising from transactions with related parties who are joint ventures. These costs are categorized as cost of goods sold + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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