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Summary of International Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 87,468 | $ 82,447 | $ 72,724 | $ 69,474 | $ 83,808 | $ 72,486 | $ 66,523 | $ 66,565 | $ 312,113 | $ 289,382 | $ 298,634
Mexico |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,690 | 17,096 | 14,601
South & Central America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,234 | 15,970 | 16,585
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,519 | 12,350 | 13,249
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 17,138 | 13,847 | 7,683
Africa |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,111 | 8,622 | 9,310
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,735 | 4,158 | 4,202
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,690 | 1,585 | 4,910
Middle East |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,041 | 3,230 | 3,166
Other |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 101 | 437 |
International |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 83,259 | $ 77,295 | $ 73,706

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