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Non Controlling Interest - Additional Information (Detail) In Millions, unless otherwise specified | 6 Months Ended
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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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