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Advances to and Investments in Foreign Joint Ventures' Operations - Schedule of Activity in Investment in Foreign Joint Ventures (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Investment in joint ventures:    
Balance, beginning of year $ 2,281,000 $ 2,331,000
Additional amounts invested and advanced (180,000) (50,000)
Balance, end of year 2,101,000 2,281,000
Undistributed earnings:    
Balance, beginning of year 7,816,000 5,736,000
Equity in earnings (loss) 3,024,000 3,088,000
Dividend distributions (1,344,000) (1,008,000)
Balance, end of year 9,496,000 7,816,000
Foreign currency translation:    
Balance, beginning of year 1,311,000 1,240,000
Change during the year 125,000 70,000
Balance, end of year 1,436,000 1,311,000
Investments, end of year 13,033,000 11,408,000
BOMAY
    
Investment in joint ventures:    
Balance, beginning of year 2,033,000 2,033,000
Additional amounts invested and advanced      
Balance, end of year 2,033,000 2,033,000
Undistributed earnings:    
Balance, beginning of year 6,400,000 4,839,000
Equity in earnings (loss) 2,066,000 2,569,000
Dividend distributions (1,321,000) (1,008,000)
Balance, end of year 7,145,000 6,400,000
Foreign currency translation:    
Balance, beginning of year 1,098,000 1,040,000
Change during the year 333,000 58,000
Balance, end of year 1,431,000 1,098,000
Investments, end of year 10,609,000 9,531,000
MIEFE
    
Investment in joint ventures:    
Balance, beginning of year 14,000 14,000
Additional amounts invested and advanced      
Balance, end of year 14,000 14,000
Undistributed earnings:    
Balance, beginning of year 755,000 739,000
Equity in earnings (loss) 115,000 16,000
Balance, end of year 870,000 755,000
Foreign currency translation:    
Balance, beginning of year 294,000 233,000
Change during the year (40,000) 61,000
Balance, end of year 254,000 294,000
Investments, end of year 1,138,000 1,063,000
AAG
    
Investment in joint ventures:    
Balance, beginning of year 234,000 284,000
Additional amounts invested and advanced (180,000) (50,000)
Balance, end of year 54,000 234,000
Undistributed earnings:    
Balance, beginning of year 661,000 158,000
Equity in earnings (loss) 843,000 503,000
Dividend distributions (23,000)   
Balance, end of year 1,481,000 661,000
Foreign currency translation:    
Balance, beginning of year (81,000) (32,000)
Change during the year (168,000) (49,000)
Balance, end of year (249,000) (81,000)
Investments, end of year $ 1,286,000 $ 814,000