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Investments in Foreign Joint Ventures - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 17 Months Ended
Apr. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Joint_Ventures
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Schedule Of Equity Method Investments [Line Items]            
Interest in joint venture foreign | Joint_Ventures       2    
Net sales   $ 13,780 $ 14,283 $ 41,393 $ 43,561  
Affiliated Entity            
Schedule Of Equity Method Investments [Line Items]            
Net sales   $ 30 $ 30 $ 190 $ 50  
BOMAY            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage   40.00%   40.00%   40.00%
Baoji Oilfield Machinery Co. Ltd.            
Schedule Of Equity Method Investments [Line Items]            
Interest in Joint Venture   51.00%   51.00%   51.00%
AA Energies, Inc.            
Schedule Of Equity Method Investments [Line Items]            
Interest in Joint Venture   9.00%   9.00%   9.00%
MIEFE            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage   41.00%   41.00%   41.00%
MIEFE's general manager            
Schedule Of Equity Method Investments [Line Items]            
Interest in Joint Venture   8.00%   8.00%   8.00%
Sonepar of France            
Schedule Of Equity Method Investments [Line Items]            
Interest in Joint Venture   51.00%   51.00%   51.00%
AAG            
Schedule Of Equity Method Investments [Line Items]            
Withdrawal from joint venture $ 640          
Proceeds from withdrawal from joint venture           $ 410
Notes receivable foreign currency translation adjustment   $ 90   $ 90   $ 90
Imputed interest       5.00%    
AAG | Subordinated Note            
Schedule Of Equity Method Investments [Line Items]            
Debt instrument, interest rate   0.00%   0.00%   0.00%
Debt instrument, maturity date       Apr. 30, 2015