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Non Controlling Interest - Additional Information (Detail) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Erdos TCH USD ($)	Jun. 30, 2012 Erdos TCH CNY	Jun. 30, 2012 Erdos TCH After Modification	Jun. 30, 2012 Xi'an TCH USD ($)	Jun. 30, 2012 Xi'an TCH CNY	Jun. 30, 2012 Xi'an TCH After Modification
Noncontrolling Interest [Line Items]
Equity interest percentage	7.00%	7.00%
Profit distribution percentage	20.00%	20.00%	40.00%	80.00%	80.00%	60.00%
Total registered capital	$ 17.55	120.00
Contributed in capital	$ 1.18	8.00		$ 16.37	112.00

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Percentage Of Share In Gain Loss From Joint Ventures

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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