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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 21, 2012 USD ($)	Jun. 30, 2012 USD ($) acre	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($) acre	Jun. 30, 2012 CNY	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Land leased from local government		32.95		32.95	32.95
Lease term				30 years	30 years
Lease expiration date				Dec. 31, 2031	Dec. 31, 2031
Operating lease annual rental payment				$ 19,005	120,000
Rental expenses		4,748	4,633	9,503		9,186
Outstanding commitments for constructing staff hostel and purchase of equipment		1,428,820		1,428,820			4,860,965
Legal settlement by insurer	$ 2,000,000