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Investment Properties - Additional Information (Detail) $ in Thousands, ฿ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 USD ($) | Dec. 31, 2016 THB (฿) | Dec. 31, 2015 USD ($)
Disclosure Of Investment Property [Abstract] |  |  |  |
Investment property estimated useful lives | 20 years |  |  |
Consideration from sale of land |  | $ 4,695 | ฿ 165 | $ 53
Gain from sale of land |  | $ 4,466 | ฿ 157 | $ 32

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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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash inflow from sales of investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The useful lives or depreciation rates used for investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2017-03-01&anchor=para_79_b&doctype=Standard -URIDate 2017-03-09 + Details
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