Components of Property, Plant and Equipment (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 63,630,597	$ 61,970,918
Less: accumulated depreciation and amortization	(21,213,041)	(18,928,782)
Total property, plant and equipment, net	42,417,556	43,042,136
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,861,043	6,861,043
Shop equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	19,960,944	19,815,360
Office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,002,854	4,028,789
Motor Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,642,125	1,642,125
Car park
Property, Plant and Equipment [Line Items]
Property, plant and equipment	20,237	20,237
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	27,515,996	27,515,996
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,627,398	$ 2,087,368