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Summary of Worldwide Export Sales (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | $ 77,295 | $ 73,706 | $ 69,772
Mexico |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 17,096 | 14,601 | 15,661
Central & South America |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 15,970 | 16,585 | 15,491
Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 12,350 | 13,249 | 12,942
Asia |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 13,847 | 7,683 | 8,129
Africa |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 8,622 | 9,310 | 8,322
Australia |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 4,158 | 4,202 | 2,692
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 1,585 | 4,910 | 3,976
Middle East |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 3,230 | $ 3,166 | 2,500
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | $ 437 |  | $ 59

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