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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) | $ (39,254) | $ (1,282) | $ 69,404 | $ (15,262)
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 | (217,785) | $ (7,113) | (46,419) | 122,514
Level 3 [member] | Debt instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Movement of financial instruments beginning balance | 338,102 |  | 384,521 |
Movement of financial instruments ending balance |  |  | 338,102 | $ 384,521
Level 3 [member] | Equity instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Movement of financial instruments beginning balance | 338,102 |  |  |
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 | (217,785) |  | (46,419) |
Purchases | 12,500 |  |  |
Reclassified as investments accounted for using equity method | (12,500) |  |  |
Movement of financial instruments ending balance | $ 120,317 |  | $ 338,102 |

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