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Condensed consolidating financial information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2010
Guarantor Obligations [Line Items]        
Restricted cash $ 258   $ 258  
Percentage of subsidiary guarantor owned by company (in hundredths) 100.00%      
Assets:        
Cash and cash equivalents 195,471 182,545   183,401
Accounts receivable — net 52,312   50,667  
Due from affiliates 43,561   37,870  
Inventories 156,815   159,925  
Due from Related Parties, Noncurrent 0      
Prepaid and other assets 41,163   34,975  
Deferred taxes - current portion 19,726   19,726  
Total current assets 509,306   487,397  
Investment in subsidiaries 0   0  
Property, plant and equipment — net 1,180,770   1,188,214  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent     0  
Other assets 101,039   100,715  
Assets 1,791,115   1,776,326  
Liabilities and shareholders' equity:        
Accounts payable, trade 75,796   75,370  
Due to affiliates 50,210   39,737  
Accrued and other current liabilities 49,001   40,099  
Accrued employee benefits costs — current portion 18,668   18,683  
Industrial revenue bonds 7,815   7,815  
Total current liabilities 201,490   181,704  
Senior notes payable 250,861   250,582  
Accrued pension benefits costs — less current portion 67,322   67,878  
Accrued postretirement benefits costs — less current portion 143,794   143,105  
Other liabilities/intercompany loan 25,278   40,162  
Deferred taxes — less current portion 110,361   110,252  
Total noncurrent liabilities 597,616   611,979  
Shareholders' equity:        
Preferred stock 1   1  
Common stock 934   933  
Additional paid-in capital 2,507,671   2,507,454  
Treasury stock, at cost (49,924)   (49,924)  
Accumulated other comprehensive income (loss) (150,297)   (151,192)  
Retained earnings (accumulated deficit) (1,316,376)   (1,324,629)  
Total shareholders' equity 992,009   982,643  
TOTAL 1,791,115   1,776,326  
Net sales:        
Third-party customers 188,514 188,839    
Related parties 132,760 137,351    
Sales Revenue – net 321,274 326,190    
Cost of goods sold 303,692 305,598    
Gross profit (loss) 17,582 20,592    
Other operating expenses – net 1,096 3,721    
Selling, general and admin expenses 16,299 8,459    
Operating income (loss) 187 8,412    
Interest expense – third party (6,076) (5,978)    
Interest expense - affiliates 0 0    
Interest income – third party 131 138    
Interest income - affiliates 0 60    
Net gain (loss) on forward contracts 15,507 (5,159)    
Other income - net 70 306    
Income (loss) before income taxes and equity in earnings of joint ventures 9,819 (2,221)    
Income tax benefit (expense) (2,517) (2,821)    
Income (loss) before equity in earnings of joint ventures 7,302 (5,042)    
Equity earnings (loss) of subsidiaries and joint ventures 951 641    
Net income (loss) 8,253 (4,401)    
Other comprehensive income before income tax effect:        
Net unrealized loss on financial instruments 0 (246)    
Net loss reclassified to income on financial instruments 0 272    
Net amount of foreign currency cash flow hedges reclassified as income (47) (47)    
Defined benefit plans and other postretirement benefits:        
Amortization of prior service benefit during the period (1,028) (1,025)    
Amortization of net loss during the period 2,352 2,184    
Other comprehensive income before income tax effect 1,277 1,138    
Income tax effect (382) (382)    
Other comprehensive income 895 756    
Total comprehensive income (loss) 9,148 (3,645)    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by operating activities 22,401 4,898    
Purchase of property, plant and equipment (9,364) (2,899)    
Nordural expansion - Helguvik (1,745) (1,946)    
Purchase of carbon anode assets and improvements (150) 0    
Investments in and advances to joint ventures 0 (100)    
Payments received on advances from joint ventures 0 3,166    
Proceeds from the sale of property, plant and equipment 353 58    
Net cash provided by (used in) investing activities (10,906) (1,721)    
Financing activities:        
Borrowings under revolving credit facility 0 18,076    
Repayments under revolving credit facility 0 (18,076)    
Intercompany transactions 0 0    
Repurchase of common stock 0 (4,033)    
Net cash provided by (used in) financing activities 0 (4,033)    
CHANGE IN CASH AND CASH EQUIVALENTS 11,495 (856)    
Cash and cash equivalents, beginning of the period 183,976 183,401   183,401
Cash and cash equivalents, end of the period 195,471 182,545   183,401
Senior secured notes due May 15, 2014 [Member]
        
Guarantor Obligations [Line Items]        
Interest rate (in hundredths) 8.00%      
Senior unsecured notes due August 15, 2014 [Member]
        
Guarantor Obligations [Line Items]        
Interest rate (in hundredths) 7.50%      
Combined Guarantor Subsidiaries [Member]
        
Guarantor Obligations [Line Items]        
Restricted cash 258   258  
Assets:        
Cash and cash equivalents 0 0   0
Accounts receivable — net 38,672   38,328  
Due from affiliates 613,979   604,008  
Inventories 98,503   97,847  
Due from Related Parties, Noncurrent 0      
Prepaid and other assets 4,397   4,421  
Deferred taxes - current portion 0   0  
Total current assets 755,809   744,862  
Investment in subsidiaries 38,107   40,335  
Property, plant and equipment — net 306,741   313,090  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent     0  
Other assets 17,611   17,616  
Assets 1,118,268   1,115,903  
Liabilities and shareholders' equity:        
Accounts payable, trade 37,924   37,301  
Due to affiliates 2,122,737   2,098,320  
Accrued and other current liabilities 11,289   13,031  
Accrued employee benefits costs — current portion 15,969   15,926  
Industrial revenue bonds 7,815   7,815  
Total current liabilities 2,195,734   2,172,393  
Senior notes payable 0   0  
Accrued pension benefits costs — less current portion 35,451   36,087  
Accrued postretirement benefits costs — less current portion 137,676   137,184  
Other liabilities/intercompany loan 50,172   65,377  
Deferred taxes — less current portion 0   0  
Total noncurrent liabilities 223,299   238,648  
Shareholders' equity:        
Preferred stock 0   0  
Common stock 60   60  
Additional paid-in capital 303,659   303,659  
Treasury stock, at cost 0   0  
Accumulated other comprehensive income (loss) (145,782)   (146,862)  
Retained earnings (accumulated deficit) (1,458,702)   (1,451,995)  
Total shareholders' equity (1,300,765)   (1,295,138)  
TOTAL 1,118,268   1,115,903  
Net sales:        
Third-party customers 137,098 135,854    
Related parties 66,629 74,530    
Sales Revenue – net 203,727 210,384    
Cost of goods sold 211,185 206,936    
Gross profit (loss) (7,458) 3,448    
Other operating expenses – net 1,096 3,721    
Selling, general and admin expenses 12,889 7,979    
Operating income (loss) (21,443) (8,252)    
Interest expense – third party (6,076) (5,978)    
Interest expense - affiliates 14,496 16,218    
Interest income – third party 14 11    
Interest income - affiliates   0    
Net gain (loss) on forward contracts 15,507 (5,159)    
Other income - net 119 804    
Income (loss) before income taxes and equity in earnings of joint ventures 2,617 (2,356)    
Income tax benefit (expense) (7,102) (253)    
Income (loss) before equity in earnings of joint ventures (4,485) (2,609)    
Equity earnings (loss) of subsidiaries and joint ventures (2,222) (230)    
Net income (loss) (6,707) (2,839)    
Defined benefit plans and other postretirement benefits:        
Other comprehensive income before income tax effect 1,084 982    
Income tax effect (391) (322)    
Other comprehensive income 693 660    
Total comprehensive income (loss) (6,014) (2,179)    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by operating activities 27,968 13,292    
Purchase of property, plant and equipment (1,723) (1,649)    
Nordural expansion - Helguvik 0 0    
Purchase of carbon anode assets and improvements 0      
Investments in and advances to joint ventures   0    
Payments received on advances from joint ventures   0    
Proceeds from the sale of property, plant and equipment 0 0    
Net cash provided by (used in) investing activities (1,723) (1,649)    
Financing activities:        
Borrowings under revolving credit facility   0    
Repayments under revolving credit facility   0    
Intercompany transactions (26,245) (11,643)    
Repurchase of common stock   0    
Net cash provided by (used in) financing activities (26,245) (11,643)    
CHANGE IN CASH AND CASH EQUIVALENTS 0 0    
Cash and cash equivalents, beginning of the period 0     0
Cash and cash equivalents, end of the period 0 0   0
Combined Non-Guarantor Subsidiaries [Member]
        
Guarantor Obligations [Line Items]        
Restricted cash 0   0  
Assets:        
Cash and cash equivalents 121,660 154,506   159,157
Accounts receivable — net 13,640   12,339  
Due from affiliates 44,335   38,328  
Inventories 58,312   62,078  
Due from Related Parties, Noncurrent 12,183      
Prepaid and other assets 30,787   30,650  
Deferred taxes - current portion 19,726   17,799  
Total current assets 288,460   271,210  
Investment in subsidiaries 0   0  
Property, plant and equipment — net 873,419   874,559  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent     3,588  
Other assets 45,277   45,474  
Assets 1,219,339   1,194,831  
Liabilities and shareholders' equity:        
Accounts payable, trade 37,011   37,627  
Due to affiliates 111,113   105,945  
Accrued and other current liabilities 16,511   31,332  
Accrued employee benefits costs — current portion 0   0  
Industrial revenue bonds 0   0  
Total current liabilities 164,635   174,904  
Senior notes payable 0   0  
Accrued pension benefits costs — less current portion 0   0  
Accrued postretirement benefits costs — less current portion 0   0  
Other liabilities/intercompany loan 635,313   614,585  
Deferred taxes — less current portion 110,361   109,011  
Total noncurrent liabilities 745,674   723,596  
Shareholders' equity:        
Preferred stock 0   0  
Common stock 12   12  
Additional paid-in capital 150,743   150,743  
Treasury stock, at cost 0   0  
Accumulated other comprehensive income (loss) (1,564)   (1,525)  
Retained earnings (accumulated deficit) 159,839   147,101  
Total shareholders' equity 309,030   296,331  
TOTAL 1,219,339   1,194,831  
Net sales:        
Third-party customers 51,416 52,985    
Related parties 66,131 62,821    
Sales Revenue – net 117,547 115,806    
Cost of goods sold 92,507 98,662    
Gross profit (loss) 25,040 17,144    
Other operating expenses – net 0 0    
Selling, general and admin expenses 3,410 480    
Operating income (loss) 21,630 16,664    
Interest expense – third party 0 0    
Interest expense - affiliates (14,496) (16,218)    
Interest income – third party 117 127    
Interest income - affiliates   60    
Net gain (loss) on forward contracts 0 0    
Other income - net (49) (498)    
Income (loss) before income taxes and equity in earnings of joint ventures 7,202 135    
Income tax benefit (expense) 4,585 (2,568)    
Income (loss) before equity in earnings of joint ventures 11,787 (2,433)    
Equity earnings (loss) of subsidiaries and joint ventures 951 641    
Net income (loss) 12,738 (1,792)    
Defined benefit plans and other postretirement benefits:        
Other comprehensive income before income tax effect (47) (47)    
Income tax effect 9 8    
Other comprehensive income (38) (39)    
Total comprehensive income (loss) 12,700 (1,831)    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by operating activities (5,567) (8,394)    
Purchase of property, plant and equipment (7,494) (1,223)    
Nordural expansion - Helguvik (1,745) (1,946)    
Purchase of carbon anode assets and improvements (150)      
Investments in and advances to joint ventures   0    
Payments received on advances from joint ventures   0    
Proceeds from the sale of property, plant and equipment 353 58    
Net cash provided by (used in) investing activities (9,036) (3,111)    
Financing activities:        
Borrowings under revolving credit facility   0    
Repayments under revolving credit facility   0    
Intercompany transactions 26,247 6,854    
Repurchase of common stock   0    
Net cash provided by (used in) financing activities 26,247 6,854    
CHANGE IN CASH AND CASH EQUIVALENTS 11,644 (4,651)    
Cash and cash equivalents, beginning of the period 110,016     159,157
Cash and cash equivalents, end of the period 121,660 154,506   159,157
Century Aluminum Company [Member]
        
Guarantor Obligations [Line Items]        
Restricted cash 0   0  
Assets:        
Cash and cash equivalents 73,811 28,039   24,244
Accounts receivable — net 0   0  
Due from affiliates 2,417,884   2,391,249  
Inventories 0   0  
Due from Related Parties, Noncurrent 0      
Prepaid and other assets 5,979   8,063  
Deferred taxes - current portion 0   0  
Total current assets 2,497,674   2,473,272  
Investment in subsidiaries (1,029,842)   (1,039,141)  
Property, plant and equipment — net 985   916  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent     0  
Other assets 36,380   37,027  
Assets 1,505,197   1,472,074  
Liabilities and shareholders' equity:        
Accounts payable, trade 861   442  
Due to affiliates 200,176   193,788  
Accrued and other current liabilities 19,273   1,967  
Accrued employee benefits costs — current portion 2,699   2,757  
Industrial revenue bonds 0   0  
Total current liabilities 223,009   198,954  
Senior notes payable 250,861   250,582  
Accrued pension benefits costs — less current portion 31,871   31,791  
Accrued postretirement benefits costs — less current portion 6,118   5,921  
Other liabilities/intercompany loan 1,329   2,183  
Deferred taxes — less current portion 0   0  
Total noncurrent liabilities 290,179   290,477  
Shareholders' equity:        
Preferred stock 1   1  
Common stock 934   933  
Additional paid-in capital 2,507,671   2,507,454  
Treasury stock, at cost (49,924)   (49,924)  
Accumulated other comprehensive income (loss) (150,297)   (151,192)  
Retained earnings (accumulated deficit) (1,316,376)   (1,324,629)  
Total shareholders' equity 992,009   982,643  
TOTAL 1,505,197   1,472,074  
Net sales:        
Third-party customers 0 0    
Related parties 0 0    
Sales Revenue – net 0 0    
Cost of goods sold 0 0    
Gross profit (loss) 0 0    
Other operating expenses – net 0 0    
Selling, general and admin expenses 0 0    
Operating income (loss) 0 0    
Interest expense – third party 0 0    
Interest expense - affiliates 0 0    
Interest income – third party 0 0    
Interest income - affiliates   0    
Net gain (loss) on forward contracts 0 0    
Other income - net 0 0    
Income (loss) before income taxes and equity in earnings of joint ventures 0 0    
Income tax benefit (expense) 0 0    
Income (loss) before equity in earnings of joint ventures 0 0    
Equity earnings (loss) of subsidiaries and joint ventures 8,253 (4,401)    
Net income (loss) 8,253 (4,401)    
Defined benefit plans and other postretirement benefits:        
Other comprehensive income before income tax effect 1,277 203    
Income tax effect (382) (68)    
Other comprehensive income 895 135    
Total comprehensive income (loss) 9,148 (4,266)    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by operating activities 0 0    
Purchase of property, plant and equipment (147) (27)    
Nordural expansion - Helguvik 0 0    
Purchase of carbon anode assets and improvements 0      
Investments in and advances to joint ventures   (100)    
Payments received on advances from joint ventures   3,166    
Proceeds from the sale of property, plant and equipment 0 0    
Net cash provided by (used in) investing activities (147) 3,039    
Financing activities:        
Borrowings under revolving credit facility   18,076    
Repayments under revolving credit facility   (18,076)    
Intercompany transactions (2) 4,789    
Repurchase of common stock   (4,033)    
Net cash provided by (used in) financing activities (2) 756    
CHANGE IN CASH AND CASH EQUIVALENTS (149) 3,795    
Cash and cash equivalents, beginning of the period 73,960     24,244
Cash and cash equivalents, end of the period 73,811 28,039   24,244
Reclassifications and Eliminations [Member]
        
Guarantor Obligations [Line Items]        
Restricted cash 0   0  
Assets:        
Cash and cash equivalents 0      
Accounts receivable — net 0   0  
Due from affiliates (3,032,637)   (2,995,715)  
Inventories 0   0  
Due from Related Parties, Noncurrent (12,183)      
Prepaid and other assets 0   (8,159)  
Deferred taxes - current portion 0   1,927  
Total current assets (3,032,637)   (3,001,947)  
Investment in subsidiaries 991,735   998,806  
Property, plant and equipment — net (375)   (351)  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent     (3,588)  
Other assets 1,771   598  
Assets (2,051,689)   (2,006,482)  
Liabilities and shareholders' equity:        
Accounts payable, trade 0   0  
Due to affiliates (2,383,816)   (2,358,316)  
Accrued and other current liabilities 1,928   (6,231)  
Accrued employee benefits costs — current portion 0   0  
Industrial revenue bonds 0   0  
Total current liabilities (2,381,888)   (2,364,547)  
Senior notes payable 0   0  
Accrued pension benefits costs — less current portion 0   0  
Accrued postretirement benefits costs — less current portion 0   0  
Other liabilities/intercompany loan (661,536)   (641,983)  
Deferred taxes — less current portion 0   1,241  
Total noncurrent liabilities (661,536)   (640,742)  
Shareholders' equity:        
Preferred stock 0   0  
Common stock (72)   (72)  
Additional paid-in capital (454,402)   (454,402)  
Treasury stock, at cost 0   0  
Accumulated other comprehensive income (loss) 147,346   148,387  
Retained earnings (accumulated deficit) 1,298,863   1,304,894  
Total shareholders' equity 991,735   998,807  
TOTAL (2,051,689)   (2,006,482)  
Net sales:        
Third-party customers 0 0    
Related parties 0 0    
Sales Revenue – net 0 0    
Cost of goods sold 0 0    
Gross profit (loss) 0 0    
Other operating expenses – net 0 0    
Selling, general and admin expenses 0 0    
Operating income (loss) 0 0    
Interest expense – third party 0 0    
Interest expense - affiliates 0 0    
Interest income – third party 0 0    
Interest income - affiliates   0    
Net gain (loss) on forward contracts 0 0    
Other income - net 0 0    
Income (loss) before income taxes and equity in earnings of joint ventures 0 0    
Income tax benefit (expense) 0 0    
Income (loss) before equity in earnings of joint ventures 0 0    
Equity earnings (loss) of subsidiaries and joint ventures (6,031) 4,631    
Net income (loss) (6,031) 4,631    
Defined benefit plans and other postretirement benefits:        
Other comprehensive income before income tax effect (1,037) 0    
Income tax effect 382 0    
Other comprehensive income (655) 0    
Total comprehensive income (loss) (6,686) 4,631    
Financing activities:        
Cash and cash equivalents, beginning of the period 0      
Cash and cash equivalents, end of the period $ 0