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Operating Segments Information - Summary of Geographical 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 geographical areas [line items] |  |  |  |  |
Operating revenue | $ 670,872,643 | $ 21,831,196 | $ 569,997,133 | $ 476,978,710 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 377,857,333 |  | 352,603,791 |  | $ 12,296,041
United States [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 446,484,639 | 14,529,276 | 353,500,361 | 297,117,001 |
Taiwan [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 83,655,142 | 2,722,263 | 94,598,067 | 64,829,301 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 268,036,245 |  | 252,525,376 |  | 8,722,299
Asia [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 75,991,902 | 2,472,890 | 62,523,167 | 74,447,091 |
Europe [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 63,542,468 | 2,067,767 | 57,910,641 | 39,477,306 |
Other geographical areas [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 1,198,492 | $ 39,001 | 1,464,897 | $ 1,108,011 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 40,537,349 |  | 34,702,992 |  | 1,319,146
China [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | $ 69,283,739 |  | $ 65,375,423 |  | $ 2,254,596

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