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Investments in Foreign Joint Ventures - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Joint_Ventures
Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items]    
Interest in joint venture foreign 3  
Accumulated statutory reserves in equity method investments $ 1.9 $ 1.9
BOMAY
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 40.00%  
Baoji Oilfield Machinery Co. Ltd.
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 51.00%  
AA Energies, Inc.
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 9.00%  
MIEFE
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 41.00%  
MIEFE's general manager
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 8.00%  
Sonepar of France
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 51.00%  
AAG
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 49.00%  
LTDA
    
Schedule Of Equity Method Investments [Line Items]    
Interest in Joint Venture 51.00%