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Income and Expenses Items - Additional Information (Detail) $ in Thousands, ฿ in Millions, ¥ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 THB (฿)
Disclosure of Other Operating Income and Expense [Line Items] |  |  |  |  |  |
Gain on disposal of assets classified as held for sale |  |  |  | $ 4,525 |  |
Consideration from sale of land |  |  |  |  | $ 4,695 | ฿ 165
Gain from sale of land |  |  |  |  | $ 4,466 | ฿ 157
Immediate Holding Company [Member] |  |  |  |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |  |  |  |
Income from discharge of liability |  |  | $ 1,537 |  |  |
Reduction of Other Current Assets [Member] |  |  |  |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |  |  |  |
Recognized other expenses - others |  |  | $ 749 |  |  |
Ningbo Pacific Cable Co., Ltd. [Member] |  |  |  |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |  |  |  |
Consideration amount within agreement to sell its buildings and land use rights at its Ningbo Pacific subsidiary | $ 8,800 | ¥ 60.6 |  |  |  |
Tax expense related to sale of building and land use rights | $ 800 |  |  |  |  |
Gain on disposal of assets classified as held for sale |  |  |  | $ 4,525 |  |

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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 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 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_16&doctype=Standard -URIDate 2018-03-16 + Details
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