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Operating Segments Information - Summary of Geographical 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 geographical areas [line items] |  |  |  |  |
Operating revenue | $ 595,409,585 | $ 18,158,267 | $ 581,914,471 | $ 670,872,643 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 416,919,169 |  | 369,608,094 |  | $ 12,714,827
United States [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 358,708,176 | 10,939,560 | 370,306,818 | 446,484,639 |
Taiwan [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 89,274,839 | 2,722,624 | 70,492,517 | 83,655,142 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 291,081,213 |  | 258,813,497 |  | 8,877,134
Asia [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 82,989,985 | 2,530,954 | 75,316,422 | 75,991,902 |
Europe [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 63,429,243 | 1,934,408 | 65,026,966 | 63,542,468 |
China [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 70,968,611 |  | 66,660,391 |  | 2,164,337
Other geographical areas [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 1,007,342 | $ 30,721 | 771,748 | $ 1,198,492 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | $ 54,869,345 |  | $ 44,134,206 |  | $ 1,673,356

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