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Financial Instruments - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase percentage of significant unobservable inputs discount rate | 1.00% | 1.00% | 0.10% |  |
Fair value of unquoted shares decreased | $ 3,800 |  | $ 7,200 |  | $ 116
Fair value of bonds decreased | $ 154,000 | $ 4,697 | $ 2,000 |  |
Percentage of trade receivables | 47.00% |  | 39.00% |  | 47.00%
Bottom of range [member] | Actuarial assumption of discount rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Significant unobservable inputs discount rate | 20.00% | 20.00% |  |  |
Top of range [member] | Actuarial assumption of discount rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Significant unobservable inputs discount rate | 30.00% | 30.00% |  |  |
Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase decrease in profit before tax | $ 1,049,000 | $ 31,991 | $ 660,000 | $ 794,000 |
Currency risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Value at risk | 274,000 |  | 148,000 | 60,000 | $ 8,356
Other price risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase decrease in profit before tax | $ 53,000 | $ 1,616 | $ 46,500 | $ 50,000 |
Equity debt ratio | 1.00% | 1.00% | 1.00% | 1.00% |
Increase decrease in other comprehensive income | $ 129,000 | $ 3,934 | $ 6,000 | $ 5,000 |

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