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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) t | Dec. 31, 2016 USD ($) t
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Leased machinery and equipment at cost used to secure finance lease liabilities, average discount interest rate | 5.11% | 4.98%
Capital commitment relating to the construction of factory building improvement and acquisition of machinery | $ 800 | $ 200
Corporate guarantee | 35,200 | 29,000
Commitments in respect of repair and maintenance consulting services with related parties | $ 100 | 100
Bottom of range [Member] |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Non-cancellable operating lease arrangements terms | 5 years |
Commitments to purchase raw materials | $ 175,000 | $ 111,000
Commitments to purchase raw materials, metric tons | t | 24,005 | 19,620
Top of range [Member] |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Non-cancellable operating lease arrangements terms | 30 years |
Commitments to purchase raw materials | $ 277,000 | $ 203,000
Commitments to purchase raw materials, metric tons | t | 37,930 | 35,920
Contingent liability for guarantees | Top of range [Member] |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Corporate guarantee | $ 31,200 | $ 31,200
Charoong Thai Wire and Cable Public Company Limited [Member] | Contingent liability for guarantees |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Corporate guarantee | 2,000 | 2,000
Machinery and equipment [Member] |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Leased machinery and equipment at cost used to secure finance lease liabilities | 148 | 131
Machinery and equipment [Member] | Accumulated depreciation [Member] |  |
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items] |  |
Leased machinery and equipment at cost used to secure finance lease liabilities | $ 98 | $ 60

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- Definition Contractual commitments for acquisition of raw materials amount. + References No definition available. + Details
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- Definition The amount of related-party commitments made by the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2017-03-09 + Details
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