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Financial Instruments - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase percentage of significant unobservable inputs discount rate | 1.00% | 1.00% | 1.00% |  |
Fair value of unquoted shares decreased | $ 6,600 |  | $ 19,300 |  | $ 215
Fair value of bonds decreased | $ 3,000 | $ 98 | $ 4,000 |  |
Percentage of trade receivables | 30.00% |  | 33.00% |  | 30.00%
Bottom of range [member] | Actuarial assumption of discount rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Significant unobservable inputs discount rate | 10.00% | 10.00% |  |  |
Top of range [member] | Actuarial assumption of discount rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Significant unobservable inputs discount rate | 20.00% | 20.00% |  |  |
Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase decrease in profit before tax | $ 794,000 | $ 25,838 | $ 959,000 | $ 862,000 |
Currency risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Value at risk | 60,000 |  | 38,000 | 35,000 | $ 1,952
Other price risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase decrease in profit before tax | $ 50,000 | $ 1,627 | $ 49,000 | $ 59,000 |
Equity debt ratio | 1.00% | 1.00% | 1.00% | 1.00% |
Increase decrease in other comprehensive income | $ 5,000 | $ 163 | $ 9,000 | $ 7,000 |

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