7. Discontinued Operations (Detail)	12 Months Ended					1 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Aug. 30, 2011 USD ($)	Aug. 30, 2011 CNY	Aug. 30, 2011 "The Agreement" [Member] USD ($)	Aug. 30, 2011 "The Agreement" [Member] CNY
Disposal Group, Including Discontinued Operation, Revenue (in Yuan Renminbi)		$ (2,341,550)				$ 133,100,000	849,000,000
Disposal Group, Including Discontinued Operation, Revenue		(2,341,550)				133,100,000	849,000,000
Proceeds from Sales of Business, Affiliate and Productive Assets (in Yuan Renminbi)						18,000,000	114,500,000
Proceeds from Sales of Business, Affiliate and Productive Assets						18,000,000	114,500,000
Increase (Decrease) in Other Receivables (in Yuan Renminbi)	(16,155,106)	(8,777,412)	1,880,244			115,100,000	734,500,000
Increase (Decrease) in Other Receivables	(16,155,106)	(8,777,412)	1,880,244			115,100,000	734,500,000
Commodity Futures Contracts and Spot Commodities, Proprietary Capital Charges (in Yuan Renminbi)				19,200,000	122,400,000
Commodity Futures Contracts and Spot Commodities, Proprietary Capital Charges				19,200,000	122,400,000
Proceeds from Commodity Futures Contracts and Spot Commodities	10,200,000	30,700,000
Commoties Received under Commodity Futures Contracts and Spot Commodities, Value	$ 10,900,000	$ 4,990,000