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Business and Geographic Segments - Business Segment Information by Geographical Areas (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
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 27,400 | $ 30,000 | $ 32,400 | $ 28,400 | $ 25,100 | $ 27,000 | $ 30,000 | $ 29,900 | $ 118,217 | $ 112,035 | $ 108,920
Total assets | 166,429 |  |  |  | 150,959 |  |  |  | 166,429 | 150,959 | 143,980
Operating Segments | Security Products |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 98,383 | 96,600 | 94,693
Total assets | 74,714 |  |  |  | 72,961 |  |  |  | 74,714 | 72,961 | 73,345
Operating Segments | Marine Components |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 19,834 | 15,435 | 14,227
Total assets | 14,189 |  |  |  | 11,704 |  |  |  | 14,189 | 11,704 | 12,209
Corporate and eliminations |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 77,526 |  |  |  | $ 66,294 |  |  |  | 77,526 | 66,294 | 58,426
Point Of Destination | United States |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 108,773 | 103,646 | 98,526
Point Of Destination | Canada |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,436 | 5,353 | 7,515
Point Of Destination | Mexico |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,438 | 1,486 | 1,315
Point Of Destination | Other |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 1,570 | $ 1,550 | $ 1,564

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