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Depreciation and Amortization Policies on Property Plant and Equipment Other Than Mineral Rights and Construction In Progress (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		8 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		20 years
Plant And Machinery | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years	5 years
Plant And Machinery | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	8 years	8 years
Motor vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		5 years
Furniture, Fixtures and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		8 years

X

- Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration