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Investments in Foreign Joint Ventures (Details Textual) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
JointVenture
Dec. 31, 2011
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in joint venture foreign 3  
Accumulated statutory reserves in equity method investments $ 1.6 $ 1.3
BOMAY [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 40.00%  
Baoji Oilfield Machinery [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 51.00%  
AA Energies [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 9.00%  
MIEFE [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 41.00%  
MIEFE's general manager [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 8.00%  
Oakwell Engineering [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 51.00%  
AAG [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 49.00%  
Ltda [Member]
    
Investments In Foreign Joint Ventures (Textual) [Abstract]    
Interest in Joint Venture 51.00%