11. PROPERTY, PLANT AND EQUIPMENT, NET (Detail) - Property, plant and equipment and related accumulated depreciation (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property, plant and equipment, gross	$ 150,330,366	$ 149,736,990
Less: Accumulated depreciation	(37,064,936)	(34,746,182)
Property, plant and equipment, net	113,265,430	114,990,808
Buildings and plant
Property, plant and equipment, gross	62,981,432	62,825,600
Machinery and equipment
Property, plant and equipment, gross	80,391,535	79,997,837
Office equipment
Property, plant and equipment, gross	4,035,410	3,933,542
Motor vehicles
Property, plant and equipment, gross	$ 2,921,989	$ 2,980,011