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Segment Information - Revenue From External Customers Based Major Categories (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 425,940 | $ 425,215 | $ 384,565
At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 408,992 |  |
Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 16,948 |  |
North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 103,647 |  |
North Asia (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 103,647 |  |
Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 213,424 |  |
Thailand (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 213,212 |  |
Thailand (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 212 |  |
ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 108,869 |  |
ROW (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 92,133 |  |
ROW (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 16,736 |  |
Power [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 156,901 |  |
Power [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 64,771 |  |
Power [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 92,130 |  |
Enamel [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 217,894 |  |
Enamel [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 103,647 |  |
Enamel [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 114,247 |  |
Others [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 51,145 |  |
Others [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 34,406 |  |
Others [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 16,739 |  |
Manufactured Products [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  | 361,853 | 296,075
Distributed Products [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  | 41,985 | 75,200
SDI [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  | $ 21,377 | $ 13,290

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