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Income and Expenses Items - Summary of Other Operating Income (Detail) $ in Thousands, ฿ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 THB (฿)
Analysis Of Income And Expense [Abstract] |  |  |  |
Gain on disposal of property, plant, and equipment | $ 93 | $ 99 | $ 100 |
Gain on disposal of investment property |  |  | 4,466 | ฿ 157
Reversal of allowance for related parties |  |  | 1 |
Gain on disposal of assets classified as held for sale |  | 4,525 |  |
Reversal of allowance for foreseeable loss | 507 |  |  |
Gain on sales of scrap copper |  |  | 569 |
Other operating income - others | 205 | 460 | 305 |
Total other operating income | $ 805 | $ 5,084 | $ 5,441 |

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- Definition Gain on sales of scrap copper. + References No definition available. + Details
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- Definition Reversal of impairment loss recognised in profit or loss for foreseeable loss. + References No definition available. + Details
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- Definition The gain on disposals of investment properties. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain on disposals of non-current assets. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of reversal of impairment loss recognised in profit or loss for trade receivables. [Refer: Reversal of impairment loss recognised in profit or loss; Trade receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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