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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