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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
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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

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