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Subsequent Event - Additional Information (Detail) ฿ / shares in Units, $ in Thousands, ฿ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 12, 2021 USD ($) | Mar. 12, 2021 THB (฿) ฿ / shares | Mar. 31, 2021 USD ($) | Apr. 22, 2021 USD ($) | Dec. 31, 2020 USD ($)
Disclosure of non-adjusting events after reporting period [Line Items] |  |  |  |  |
Copper price per ton |  |  |  |  | $ 7,742
Major ordinary share transactions [Member] | Charoong Thai Wire and Cable Public Company Limited [Member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [Line Items] |  |  |  |  |
Dividend payments declared to its shareholders | $ 5,900 | ฿ 179.1 |  |  |
Dividend payments declared to its shareholders, per share | ฿ / shares |  | ฿ 0.45 |  |  |
Dividend payment date | May 14, 2021 | May 14, 2021 |  |  |
Dividends paid to non-controlling interests | $ 2,900 |  |  |  |
Subsequent Event [Member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [Line Items] |  |  |  |  |
Copper price per ton |  |  |  | $ 9,476 |
Unrealized loss |  |  | $ 4,600 |  |

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