Inventories by Major Categories (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Raw materials	$ 8,775,850	$ 12,906,713
Work in progress	183,699	419,695
Inventories	12,140,696	17,844,405
CCA and copper wire
Schedule of Inventory [Line Items]
Other inventory	2,863,021	2,947,584
Copper rod and anode
Schedule of Inventory [Line Items]
Other inventory	$ 318,126	$ 1,570,413