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Advances to and Investments in Foreign Joint Ventures' Operations - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2006
Schedule Of Equity Method Investments [Line Items]        
Equity income from foreign joint ventures' operations $ 3,024,000 $ 3,088,000    
Advances to and Investments in Joint Venture Foreign Operations (Textual) [Abstract]        
Foreign joint ventures' operations related expenses 267,000 343,000    
Accumulated statutory reserves in equity method investments 1,857,000 1,620,000    
Foreign Operations
       
Advances to and Investments in Joint Venture Foreign Operations (Textual) [Abstract]        
Foreign joint ventures' operations related expenses 267,000 343,000    
BOMAY
       
Schedule Of Equity Method Investments [Line Items]        
Interest in Joint Venture 40.00%      
Investment in joint ventures     1,000,000 1,000,000
Equity income from foreign joint ventures' operations 2,066,000 2,569,000    
Sales made to the foreign joint venture 325,000 415,000    
Accounts receivable from foreign joint venture 119,000 73,000    
MIEFE
       
Schedule Of Equity Method Investments [Line Items]        
Interest in Joint Venture 41.00%      
Equity income from foreign joint ventures' operations 115,000 16,000    
Sales made to the foreign joint venture 225,000 65,000    
Accounts receivable from foreign joint venture 0 25,000    
AAG
       
Schedule Of Equity Method Investments [Line Items]        
Interest in Joint Venture 49.00%      
Equity income from foreign joint ventures' operations 843,000 503,000    
Sales made to the foreign joint venture 4,000 49,000    
Accounts receivable from foreign joint venture $ 8,000 $ 8,000