Land Use Rights, Net (Additional Information) (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Purchase of land use rights	$ (89,809)	$ 0
Amortization of Intangible Assets	$ 11,721	$ 11,794

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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