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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements of Level 3 (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) | $ 69,404 | $ 2,259 | $ (15,262) | $ (24,015)
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income | (46,419) | $ (1,511) | 122,514 | 140,199
Level 3 [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Movement of financial instruments beginning balance | 384,521 |  | 272,375 |
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) |  |  | 941 |
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income | (46,419) |  | 122,514 |
Sold in the period |  |  | (9,427) |
Movement of financial instruments ending balance | 338,102 |  | 384,521 | 272,375
Level 3 [member] | Debt instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Movement of financial instruments beginning balance |  |  | 10,368 |
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) |  |  | 941 |
Sold in the period |  |  | (9,427) |
Movement of financial instruments ending balance |  |  |  | 10,368
Level 3 [member] | Equity instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Movement of financial instruments beginning balance | 384,521 |  | 262,007 |
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income | (46,419) |  | 122,514 |
Movement of financial instruments ending balance | $ 338,102 |  | $ 384,521 | $ 262,007

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- Definition The gains (losses) on financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value; Gains (losses) on financial assets at fair value through profit or loss; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 20 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9, before tax, before reclassification adjustments. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 20 -Subparagraph a -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_20_a_viii&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_b&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash inflow from sales or maturity of financial instruments, classified as investing activities. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_16&doctype=Standard -URIDate 2022-03-24 + Details
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