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Summary of Significant Accounting Policies - Additional Information (Detail) | 6 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 USD ($) | Dec. 31, 2011 USD ($) | Jun. 30, 2012 Xi'an TCH USD ($) MW | Jun. 30, 2012 Xi'an TCH CNY | Dec. 31, 2011 Xi'an TCH USD ($) | Jun. 30, 2012 Xi'an TCH First Installment Within 5 working days of the Repurchase Agreement date | Jun. 30, 2012 Xi'an TCH Second Installment Within 90 days of the Repurchase Agreement date | Jun. 30, 2012 Xi'an TCH Third Installment Within 180 days of the date of Repurchase Agreement date | Jun. 30, 2012 Xi'an TCH Erdos TCH
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  | 93.00%
Account receivable |  |  | $ 140,000 |  | $ 19,110,000 |  |  |  |
Capacity of plant |  |  | 18 | 18 |  |  |  |  |
Cash Paid by Xi'an TCH to Shenmu |  |  | 18,750,000 | 120,000,000 |  |  |  |  |
Paid in installment |  |  |  |  |  | 30.00% | 30.00% | 40.00% |
Long lived assets impairment amount | 0 | 0 |  |  |  |  |  |  |
Measurement of tax position, minimum likelihood of tax benefits being realized upon settlement, percentage | 50.00% |  |  |  |  |  |  |  |
Uncertain tax position liability | 0 | 0 |  |  |  |  |  |  |
Asset and Liabilities,Fair value | $ 0 | $ 0 |  |  |  |  |  |  |

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