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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) t | Dec. 31, 2018 USD ($) 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%
Capital commitment relating to the construction of factory building improvement and acquisition of machinery | $ 5.8 | $ 0.6
Corporate guarantee | 38.5 | 36.9
Commitments in respect of management consulting services with related parties | 0.3 | $ 0.2
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 | $ 200.0 | $ 136.0
Commitments to purchase raw materials, metric tons | t | 20,996 | 22,450
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 | $ 290.0 | $ 176.0
Commitments to purchase raw materials, metric tons | t | 30,580 | 28,940
Contingent liability for guarantees | Top of range [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Corporate guarantee | $ 24.7 | $ 24.3
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 | $ 0.0 | $ 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 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 2019-01-01 -Paragraph 21 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_21_i&doctype=Standard -URIDate 2019-03-27 + Details
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