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Business and Geographic Segments - Schedule of Business Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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: |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 27,400 | $ 30,000 | $ 32,400 | $ 28,400 | $ 25,100 | $ 27,000 | $ 30,000 | $ 29,900 | $ 118,217 | $ 112,035 | $ 108,920
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income | $ 2,900 | $ 4,500 | $ 6,000 | $ 4,400 | $ 2,700 | $ 3,400 | $ 4,600 | $ 4,500 | 17,811 | 15,235 | 15,574
Interest income |  |  |  |  |  |  |  |  | 2,664 | 1,929 | 390
Income before income taxes |  |  |  |  |  |  |  |  | 20,475 | 17,164 | 15,964
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,454 | 3,673 | 3,698
Total capital expenditure |  |  |  |  |  |  |  |  | 3,117 | 2,796 | 3,175
Operating Segments | Security Products |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 98,383 | 96,600 | 94,693
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | 21,947 | 19,182 | 19,981
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,914 | 3,072 | 3,025
Total capital expenditure |  |  |  |  |  |  |  |  | 2,126 | 2,389 | 3,017
Operating Segments | Marine Components |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 19,834 | 15,435 | 14,227
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | 2,738 | 1,342 | 1,707
Depreciation and amortization |  |  |  |  |  |  |  |  | 535 | 591 | 663
Total capital expenditure |  |  |  |  |  |  |  |  | 991 | 405 | 153
Corporate |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (6,874) | (5,289) | (6,114)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 5 | 10 | 10
Total capital expenditure |  |  |  |  |  |  |  |  |  | $ 2 | $ 5

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