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Other Operating Income (Expenses), Net - Summary of Other Operating Income (Expenses), Net (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Gain on disposal of property, plant and equipment, net | $ 20,271 |  | $ 14,274 | $ 132,777
Impairment loss on property, plant and equipment | (9,938) |  |  | (956)
Gain on disposal of scrapped materials | 43,652 |  | 59,380 | 27,940
Gain on disposal of items purchased on behalf of others | 15,080 |  | 31,268 | 26,417
Royalty income | 12,336 |  | 43,224 | 11,998
Insurance compensation income | 10,435 |  | 147 | 486,858
Others | 1,092 |  | (779) | 7,800
Other operating income (expenses), net | $ 92,928 | $ 3,107 | $ 147,514 | $ 692,834

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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_a&doctype=Standard -URIDate 2019-03-27 + Details
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