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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, 2016
Dec. 31, 2015
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 8,087 8,515
Equity in earnings (loss) 801 741
Dividend distributions (589) (1,169)
Balance, end of year 8,299 8,087
Foreign currency translation:    
Balance, beginning of year 970 1,492
Change, during the year (653) (522)
Balance, end of year 317 970
Investments, end of year 10,663 11,104
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 8,098 8,157
Equity in earnings (loss) 804 973
Dividend distributions (589) (1,032)
Balance, end of year 8,313 8,098
Foreign currency translation:    
Balance, beginning of year 765 1,358
Change, during the year (661) (593)
Balance, end of year 104 765
Investments, end of year 10,450 10,896
MIEFE    
Investments in foreign joint ventures:    
Balance, beginning of year 14 14
Balance, end of year 14 14
Undistributed earnings:    
Balance, beginning of year (11) 358
Equity in earnings (loss) (3) (232)
Dividend distributions   (137)
Balance, end of year (14) (11)
Foreign currency translation:    
Balance, beginning of year 205 134
Change, during the year 8 71
Balance, end of year 213 205
Investments, end of year $ 213 $ 208