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Financial Instrument - Risk Management and Fair Value - Summary of Credit Risk Exposure on Trade Receivables using Provision Matrix (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of credit risk exposure [line items] |  |
Gross carrying amount | $ 72,172 | $ 137,499
Expected credit loss | $ 6,483 | $ 5,579
Current [member] |  |
Disclosure of credit risk exposure [line items] |  |
Expected credit loss rate | 0.00% | 0.10%
Gross carrying amount | $ 50,180 | $ 111,778
Expected credit loss | $ 20 | $ 99
Past due 1 to 30 days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Expected credit loss rate | 0.10% | 2.30%
Gross carrying amount | $ 3,554 | $ 6,170
Expected credit loss | $ 3 | $ 141
Past due 31 to 60 days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Expected credit loss rate | 2.50% | 3.70%
Gross carrying amount | $ 1,867 | $ 2,786
Expected credit loss | $ 46 | $ 104
Past due 61 to 90 days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Expected credit loss rate | 3.70% | 12.00%
Gross carrying amount | $ 1,228 | $ 1,636
Expected credit loss | $ 46 | $ 196
More than 90 days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Expected credit loss rate | 41.50% | 33.30%
Gross carrying amount | $ 15,343 | $ 15,129
Expected credit loss | $ 6,368 | $ 5,039

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The maximum exposure to the credit risk of financial assets designated as measured at fair value through profit or loss. [Refer: Credit risk [member]; Maximum exposure to credit risk] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 9 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_9_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of undiscounted expected credit losses at initial recognition on financial assets initially recognised during the reporting period as purchased or originated credit-impaired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H_c&doctype=Standard -URIDate 2020-01-01 + Details
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