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Summary of International Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 131,338 | $ 111,780 | $ 107,046 | $ 104,108 | $ 116,494 | $ 89,975 | $ 77,905 | $ 70,673 | $ 454,272 | $ 355,047 | $ 312,113
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,828 | 28,880 | 17,138
South and Central America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86,172 | 25,748 | 16,234
Mexico |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 24,578 | 16,030 | 16,690
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 11,059 | 10,700 | 14,519
Africa |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,027 | 7,893 | 7,111
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,635 | 4,334 | 3,735
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,403 | 4,083 | 3,690
Middle East |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,256 | 1,237 | 4,041
Other |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 101
International |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 153,958 | $ 98,905 | $ 83,259

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