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Advances to and Investments in Foreign Joint Ventures' Operations - Schedule of Activity in Investment in Foreign Joint Ventures (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investments in foreign joint ventures:    
Balance, beginning of year $ 2,047 $ 2,047
Balance, end of year 2,047 2,047
Undistributed earnings:    
Balance, beginning of year 8,299 8,087
Equity in earnings (loss) 434 801
Dividend distributions (780) (589)
Balance, end of year 7,953 8,299
Foreign currency translation:    
Balance, beginning of year 317 970
Change, during the year 630 (653)
Balance, end of year 947 317
Investments, end of year 10,947 10,663
BOMAY    
Investments in foreign joint ventures:    
Balance, beginning of year 2,033 2,033
Balance, end of year 2,033 2,033
Undistributed earnings:    
Balance, beginning of year 8,313 8,098
Equity in earnings (loss) 434 804
Dividend distributions (780) (589)
Balance, end of year 7,967 8,313
Foreign currency translation:    
Balance, beginning of year 104 765
Change, during the year 633 (661)
Balance, end of year 737 104
Investments, end of year 10,737 10,450
MIEFE    
Investments in foreign joint ventures:    
Balance, beginning of year 14 14
Balance, end of year 14 14
Undistributed earnings:    
Balance, beginning of year (14) (11)
Equity in earnings (loss)   (3)
Balance, end of year (14) (14)
Foreign currency translation:    
Balance, beginning of year 213 205
Change, during the year (3) 8
Balance, end of year 210 213
Investments, end of year $ 210 $ 213