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Advances to and Investments in Foreign Joint Venture Operations - Schedule of Investments in and Advances to Foreign Joint Venture Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Undistributed earnings:    
Dividend distributions $ (174) $ (125)
Foreign currency translation:    
Total investments at end of year 9,980 10,947
BOMAY    
Investments in foreign joint ventures:    
Balance at beginning and end of year 2,033 2,033
Undistributed earnings:    
Balance at beginning of year 7,967 8,313
Equity in earnings (loss) 953 434
Dividend distributions (1,127) (780)
Balance at end of year 7,793 7,967
Foreign currency translation:    
Balance at beginning of year 737 104
Change during the year (583) 633
Balance at end of year 154 737
Total investments at end of year 9,980 10,737
MIEFE    
Foreign currency translation:    
Balance at beginning of year 210 213
Change during the year $ (210) (3)
Balance at end of year   210
Total investments at end of year   $ 210