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Investments in Foreign Joint Ventures - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Joint_Ventures
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule Of Equity Method Investments [Line Items]      
Interest in joint venture foreign | Joint_Ventures 2    
Net sales $ 8,289,000 $ 8,030,000  
Affiliated Entity      
Schedule Of Equity Method Investments [Line Items]      
Net sales $ 0 $ 0  
BOMAY      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 40.00%    
Joint venture expiration year 2018    
Joint venture term 12 years    
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]      
Equity method investment, ownership percentage 41.00%    
Written down of equity method investment excluding foreign currency translation     $ 0
Foreign currency translation     $ 210,000
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%