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Significant Assets and Liabilities Denominated in Foreign Currencies - Summary of Significant Assets and Liabilities Denominated in Foreign Currencies (Detail) € in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
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Dec. 31, 2024 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 JPY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 JPY (¥)
US Dollar [member] | US dollar equals to New Taiwan dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Financial assets | $ 198,312,976 | $ 167,231,335 |  | $ 6,048,894 |  |  |  | $ 5,446,388 |  |  |
Financial liabilities | $ 194,106,411 | $ 160,491,098 |  | $ 5,920,586 |  |  |  | $ 5,226,872 |  |  |
Exchange Rate | US$1=NT$32.785 | US$1=NT$30.705 | US$1=NT$30.71 |  |  |  |  |  |  |  |
Exchange Rate | US$1=NT$32.785 | US$1=NT$30.705 | US$1=NT$30.71 |  |  |  |  |  |  |  |
US Dollar [member] | US dollar equals to Chinese yuan [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Financial assets | $ 53,404,267 | $ 39,310,262 |  |  | ¥ 1,628,924 |  |  |  | ¥ 1,280,256 |  |
Financial liabilities | $ 30,668,260 | $ 31,595,564 |  |  | ¥ 935,436 |  |  |  | ¥ 1,029,004 |  |
Exchange Rate | US$1=RMB7.1884 | US$1=RMB7.0827 |  |  |  |  |  |  |  |  |
Exchange Rate | US$1=RMB7.1884 | US$1=RMB7.0827 |  |  |  |  |  |  |  |  |
US Dollar [member] | Us Dollar Equals To Euro [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Financial assets | $ 2,139,276 | $ 2,125,037 |  |  |  | € 65,252 |  |  |  | € 69,208 |
Financial liabilities | $ 1,151,894 | $ 1,147,458 |  |  |  | € 35,135 |  |  |  | € 37,370 |
Exchange Rate | US$1=EUR0.9626 | US$1=EUR0.9050 |  |  |  |  |  |  |  |  |
Exchange Rate | US$1=EUR0.9626 | US$1=EUR0.9050 |  |  |  |  |  |  |  |  |
Japanese Yen [Member] | Japanese yen equals to New Taiwan dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Financial assets | $ 1,806,027 | $ 1,069,957 |  |  |  |  | ¥ 8,604,226 |  |  |  | ¥ 4,926,139
Financial liabilities | $ 1,979,374 | $ 1,494,793 |  |  |  |  | 9,430,081 |  |  |  | 6,882,104
Exchange Rate | JPY1=NT$0.2099 | JPY1=NT$0.2172 |  |  |  |  |  |  |  |  |
Exchange Rate | JPY1=NT$0.2099 | JPY1=NT$0.2172 |  |  |  |  |  |  |  |  |
Japanese Yen [Member] | Japanese yen equals to US dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Financial assets | $ 49,716 | $ 39,517 |  |  |  |  | 236,858 |  |  |  | 181,939
Financial liabilities | $ 335,530 | $ 209,730 |  |  |  |  | ¥ 1,598,522 |  |  |  | ¥ 965,608
Exchange Rate | JPY1=US$0.0064 | JPY1=US$0.0071 |  |  |  |  |  |  |  |  |
Exchange Rate | JPY1=US$0.0064 | JPY1=US$0.0071 |  |  |  |  |  |  |  |  |

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