Equity Investment - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Jan. 31, 2013 USD ($)	Jan. 31, 2013 CNY	Sep. 30, 2013 Maximum	Sep. 30, 2013 Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, aggregate cost					$ 1,330,000	8,000,000
Equity ownership percentage	20.00%		20.00%		20.00%	20.00%	50.00%	20.00%
Income (loss) from equity investment	$ 12,418	$ 0	$ 28,768	$ 0