Net Revenue and Gross Profit By Product (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	$ 245,804,613	$ 191,007,886	$ 464,034,152	$ 360,094,153
Gross profit	23,769,881	20,711,034	44,825,233	39,346,026
Copper and CCA wire
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	97,504,064	100,397,360	184,506,019	190,044,806
Gross profit	11,169,852	12,502,426	21,246,697	23,345,750
Copper anode
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	128,635,293	70,202,817	242,600,149	133,171,370
Gross profit	11,653,637	7,116,806	21,861,048	14,141,760
Refined copper rod
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	19,665,256	20,407,709	36,927,984	36,877,977
Gross profit	$ 946,392	$ 1,091,802	$ 1,717,488	$ 1,858,516