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Capital Management - Debt to Capital Ratios (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
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Disclosure Of Capital Management [Abstract] |  |  |  |  |  |
Total liabilities | $ 194,462,244 | $ 5,930,535 | $ 202,859,864 |  |  |
Less: Cash and cash equivalents | (105,000,226) | (3,202,203) | (132,553,615) | $ (4,042,502) | $ (173,818,777) | $ (132,622,131)
Net debt | 89,462,018 |  | 70,306,249 |  |  |
Total equity | 365,706,711 | $ 11,152,995 | 343,716,968 |  | $ 322,810,948 | $ 264,375,047
Total capital | $ 455,168,729 |  | $ 414,023,217 |  |  |
Debt to capital ratios | 19.65% | 19.65% | 16.98% | 16.98% |  |

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