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Equity - Summary of Capital Surplus (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure of classes of share capital [abstract] |  |  |
Issuance of ordinary shares | $ 16,519,296 | $ 503,791 | $ 15,737,752
Merger by share exchange | 117,693,658 | 3,589,316 | 117,693,658
Difference between consideration and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition | 3,240,987 | 98,841 | 3,240,987
Exercised employee share options | 3,706,398 | 113,034 | 3,503,786
Treasury share transactions | 1,059,253 | 32,304 | 679,791
Donation from shareholders | 471,894 | 14,391 | 471,894
Expired share options | 647,094 | 19,735 | 646,773
Capital surplus deficit distributed as cash dividends | 143,338,580 | 4,371,412 | 141,974,641
Changes in percentage of ownership interest in subsidiaries | 40,151 | 1,224 | 208,310
Share of changes in capital surplus of associates accounted for using the equity method | 26,029 | 794 | 21,584
Dividends that the claim period has elapsed and unclaimed by shareholders | 6,198 | 189 | 6,130
Exercised disgorgement | 326 | 10 | 326
Capital surplus offset deficit | 72,704 | 2,217 | 236,350
Employee share options | 3,325,062 | 101,405 | 1,904,176
Employee restricted stock awards | 1,861,744 | 56,778 | (49,650)
Others | 119,172 | 3,634 | 207,109
Capital surplus for other purpose | 5,305,978 | 161,817 | 2,061,635
Capital surplus | $ 148,717,262 | $ 4,535,446 | $ 144,272,626

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