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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) t | Dec. 31, 2017 USD ($) t
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Leased motor vehicle to secure finance lease liabilities, average discount interest rate | 5.18% | 5.11%
Capital commitment relating to the construction of factory building improvement and acquisition of machinery | $ 0.6 | $ 0.8
Corporate guarantee | 36.9 | 35.2
Commitments in respect of repair and maintenance consulting services with related parties | $ 0.2 | 0.1
Bottom of range [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Non-cancellable operating lease arrangements terms | 1 year |
Commitments to purchase raw materials | $ 136.0 | $ 175.0
Commitments to purchase raw materials, metric tons | t | 22,450 | 24,005
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 | $ 176.0 | $ 277.0
Commitments to purchase raw materials, metric tons | t | 28,940 | 37,930
Contingent liability for guarantees | Top of range [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Corporate guarantee | $ 24.3 | $ 31.2
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 | $ 2.0 | $ 2.0

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- Definition Contractual commitments for acquisition of raw materials amount. + References No definition available. + Details
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- Definition Operating lease term. + 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 2018-01-01 -Paragraph 21 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 74 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_74_c&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2018-03-16 + Details
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