Net Revenue and Gross Profit by Product (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net revenue from unaffiliated customers:
Revenue	$ 191,007,886	$ 167,012,527	$ 360,094,153	$ 303,943,623
Gross profit:
Gross profit	20,711,034	19,647,463	39,346,026	36,555,536
Copper and CCA wire
Net revenue from unaffiliated customers:
Revenue	100,397,360	93,513,329	190,044,806	164,424,965
Gross profit:
Gross profit	12,502,426	13,833,862	23,345,750	24,810,315
Copper anode
Net revenue from unaffiliated customers:
Revenue	70,202,817	73,499,198	133,171,370	139,518,658
Gross profit:
Gross profit	7,116,806	5,813,601	14,141,760	11,745,221
Refined copper rod
Net revenue from unaffiliated customers:
Revenue	20,407,709		36,877,977
Gross profit:
Gross profit	$ 1,091,802		$ 1,858,516