Net Revenue and Gross Profit By Product (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	$ 219,359,379	$ 238,793,030	$ 683,393,531	$ 598,887,183
Gross profit	21,098,349	25,256,402	65,923,582	64,602,428
Copper and CCA wire
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	85,642,421	101,242,664	270,148,440	291,287,470
Gross profit	9,777,841	12,791,911	31,024,538	36,137,661
Copper anode
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	116,747,004	118,235,921	359,347,153	251,407,291
Gross profit	10,456,128	11,425,027	32,317,176	25,566,787
Refined copper rod
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	16,969,954	19,314,445	53,897,938	56,192,422
Gross profit	$ 864,380	$ 1,039,464	$ 2,581,868	$ 2,897,980