Net Revenue and Gross Profit By Product (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers	$ 217,333,427	$ 219,359,379	$ 245,804,613	$ 218,229,539	$ 254,879,358	$ 238,793,030	$ 191,007,886	$ 169,086,267	$ 177,579,159	$ 155,570,657	$ 167,012,527	$ 136,931,096	$ 900,726,958	$ 853,766,541	$ 637,093,439
Gross profit	20,475,636	21,098,349	23,769,881	21,055,352	24,945,946	25,256,402	20,711,034	18,634,992	19,701,206	19,456,930	19,647,463	16,908,073	86,399,218	89,548,374	75,713,672
Fine copper wire
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers													170,903,382	188,810,251	124,062,182
Gross profit													9,727,112	11,462,253	8,399,703
Superfine copper wire
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers													135,328,792	144,337,762	149,808,595
Gross profit													15,469,518	16,820,626	19,947,147
CCA wire
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers													53,284,353	60,634,148	61,703,257
Gross profit													16,359,209	19,602,531	21,375,471
Copper anode
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers													472,042,033	381,114,304	287,269,353
Gross profit													41,693,682	37,667,562	25,224,807
Refined copper rod
Schedule Of Entity Wide Revenue And Gross Profit By Major Products [Line Items]
Net revenue from unaffiliated customers													69,168,398	78,870,076	14,250,052
Gross profit													$ 3,149,697	$ 3,995,402	$ 766,544