Estimated Useful Lives of Assets (Detail)	12 Months Ended
Dec. 31, 2012
Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	20 years
Machinery \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	5 years
Machinery \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	10 years
Office equipment & motor vehicles
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	5 years

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.

No definition available.

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