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Financial Instruments - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Significant unobservable inputs discount rate | 31.00% | 31.00% |  |  |  |  |
Increase percentage of significant unobservable inputs discount rate | 1.00% | 1.00% | 0.10% | 0.10% |  |  |
Fair value of unquoted shares decreased | $ 19,300 |  | $ 9,700 |  |  |  | $ 696
Fair value of bonds decreased | $ 4,000 | $ 144 | $ 5,000 |  |  |  |
Percentage of trade receivables | 33.00% |  | 27.00% |  |  |  | 33.00%
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 | 30.00% | 30.00% |  |  |  |  |
Floating interest rate [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Increase decrease in profit before tax |  |  | $ 959,000 | $ 34,571 | $ 862,000 | $ 1,232,000 |
Currency risk [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Value at risk | $ 38,000 |  | 35,000 |  | 82,000 |  | $ 1,370
Other price risk [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Increase decrease in profit before tax | 49,000 | $ 1,766 | 59,000 |  | $ 51,000 |  |
Equity debt ratio |  |  |  |  | 1.00% |  |
Increase decrease in other comprehensive income | $ 9,000 | $ 324 | $ 7,000 |  | $ 8,000 |  |

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