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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary Of Significant Accounting Policies [Line Items]        
Value added tax rate levied on majority of products     17.00%  
Minimum likelihood of tax benefits being realized upon settlement 50.00%   50.00%  
Depreciation expense $ 195,130 $ 195,941 $ 380,693 $ 349,414
Use Rights
       
Summary Of Significant Accounting Policies [Line Items]        
Finite lived intangible assets, useful Life     50 years  
Finite lived intangible assets amortization period     2059  
Amortization expense $ 16,613 $ 16,297 $ 33,027 $ 32,622
Liaoning Nengfa Weiye Tei Fa Sales Co Ltd
       
Summary Of Significant Accounting Policies [Line Items]        
Percentage of equity interests 99.00%   99.00%  
Equity interests not consolidated 1.00%   1.00%  
Minimum
       
Summary Of Significant Accounting Policies [Line Items]        
Retention receivable percentage 5.00%   5.00%  
Service revenue billing period     2 months  
Portion of project contract balance withheld period     12 months  
Customers billing period     1 month  
Maximum
       
Summary Of Significant Accounting Policies [Line Items]        
Retention receivable percentage 10.00%   10.00%  
Service revenue billing period     3 months  
Portion of project contract balance withheld period     24 months  
Customers billing period     6 months