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Other Income (Expenses), Net - Summary of Other Income (Expenses), Net (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Gain on disposal of scrapped materials | $ 51,077 |  | $ 43,652 | $ 59,380
Royalty income | 2,962 |  | 12,336 | 43,224
Gain on disposal of items purchased on behalf of others | 30,140 |  | 15,080 | 31,268
Gain on disposal of property, plant and equipment, net | 48,070 |  | 20,271 | 14,274
Insurance compensation income |  |  | 10,435 | 147
Impairment loss on property, plant and equipment |  |  | (9,938) |
Others | 3,329 |  | 1,092 | (779)
Other income (expenses), net | $ 135,578 | $ 4,828 | $ 92,928 | $ 147,514

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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 2020-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_c&doctype=Standard -URIDate 2020-01-01 + Details
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