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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
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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

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