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Summary of International Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 116,494 | $ 89,975 | $ 77,905 | $ 70,673 | $ 87,468 | $ 82,447 | $ 72,724 | $ 69,474 | $ 355,047 | $ 312,113 | $ 289,382
Mexico |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,030 | 16,690 | 17,096
South and Central America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 25,748 | 16,234 | 15,970
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,700 | 14,519 | 12,350
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 28,880 | 17,138 | 13,847
Africa |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,893 | 7,111 | 8,622
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,334 | 3,735 | 4,158
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,083 | 3,690 | 1,585
Middle East |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,237 | 4,041 | 3,230
Other |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 101 | 437
International |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 98,905 | $ 83,259 | $ 77,295

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