XML 46 R77.htm IDEA: XBRL DOCUMENT v2.4.0.8

Property, Plant, and Equipment Property, Plant, and Equipment (Detail Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation	$ 66,570	$ 62,570	$ 62,194
Mt. Holly Property, plant and equipment, gross	179,702	178,528
Mt. Holly Property Property, plant and equipment, accumulated depreciation	$ 119,275	$ 113,174

X

- Definition

Represents the entity's equity undivided ownership interest in property, plant and equipment in Mt. Holly partnership.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the accumulated depreciation on entity's equity undivided ownership interest in property, plant and equipment in Mt. Holly partnership.

+ References

No definition available.

+ Details

Name:	cenx_EquityMethodInvestmentOwnershipInPropertyPlantAndEquipmentAccumulatedDepreciation
Namespace Prefix:	cenx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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