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Investments in Foreign Joint Ventures - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Joint_Ventures
Sep. 30, 2015
USD ($)
Schedule Of Equity Method Investments [Line Items]          
Interest in joint venture foreign | Joint_Ventures       2  
Net sales $ 8,673,000   $ 13,780,000 $ 28,415,000 $ 41,393,000
Affiliated Entity          
Schedule Of Equity Method Investments [Line Items]          
Net sales $ 20,000   $ 30,000 $ 70,000 $ 190,000
BOMAY          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 40.00%     40.00%  
Joint venture term       12 years  
Baoji Oilfield Machinery Co. Ltd.          
Schedule Of Equity Method Investments [Line Items]          
Interest in Joint Venture 51.00%     51.00%  
AA Energies, Inc.          
Schedule Of Equity Method Investments [Line Items]          
Interest in Joint Venture 9.00%     9.00%  
MIEFE          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 41.00%     41.00%  
Written down of equity method investment   $ 0      
Losses recognized from investment       $ 270,000  
MIEFE | Accrued in Other Current Liabilities          
Schedule Of Equity Method Investments [Line Items]          
Remaining investment from joint venture $ 270,000     $ 270,000  
MIEFE's general manager          
Schedule Of Equity Method Investments [Line Items]          
Interest in Joint Venture 8.00%     8.00%  
Sonepar of France          
Schedule Of Equity Method Investments [Line Items]          
Interest in Joint Venture 51.00%     51.00%