Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012
Buildings [Member]
Summary of property and equipment, estimated useful lives
Estimated useful lives of property and equipment	15-20 years
Plant and machinery [Member]
Summary of property and equipment, estimated useful lives
Estimated useful lives of property and equipment	3-20 years
Motor vehicles [Member]
Summary of property and equipment, estimated useful lives
Estimated useful lives of property and equipment	10 years
Office equipment [Member]
Summary of property and equipment, estimated useful lives
Estimated useful lives of property and equipment	3-10 years