Inventories (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Self Owned Inventories [Abstract]
Raw materials	$ 56,662,103	$ 8,548,288
Work-in-progress	101,128,019	109,311,733
Finished goods	13,498,429	26,899,404
Inventory in transit	0	5,281,996
Inventory valuation allowance	(1,908,402)	0
Total inventory	$ 169,380,149	$ 150,041,421