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Income Tax - Summary of Movements of Deferred Tax Assets and Deferred Tax Liabilities (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Recognized in Profit or Loss | $ 1,692,905 | $ 51,629 | $ 1,296,257 | $ (260,466)
Recognized in Other Comprehensive Income | (82,157) | (2,505) | (270,410) | 161,609
Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 6,395,595 | 195,047 | 6,341,772 | 5,369,010
Acquisitions through Business Combinations | 153,821 | 4,691 | 893 |
Recognized in Profit or Loss | 882,998 | 26,929 | (65,243) | 940,256
Recognized in Other Comprehensive Income | (62,170) | (1,896) | (4,844) | (208,482)
Exchange Differences | (194,873) | (5,943) | 123,017 | 240,988
Balance at December 31 | 7,175,371 | 218,828 | 6,395,595 | 6,341,772
Deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 7,703,646 | 234,939 | 8,585,132 | 7,590,197
Acquisitions through Business Combinations | 92,842 | 2,831 | 109,945 |
Recognized in Profit or Loss | (809,907) | (24,700) | (1,361,500) | 1,200,722
Recognized in Other Comprehensive Income | 19,987 | 609 | 265,566 | (370,091)
Exchange Differences | (156,464) | (4,771) | 104,503 | 164,304
Balance at December 31 | 6,850,104 | 208,908 | 7,703,646 | 8,585,132
Property, plant and equipment [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 266,164 | 8,117 | 148,428 | 90,977
Acquisitions through Business Combinations | 123,696 | 3,772 |  |
Recognized in Profit or Loss | (36,352) | (1,108) | 110,253 | 40,498
Exchange Differences | 1,044 | 32 | 7,483 | 16,953
Balance at December 31 | 354,552 | 10,813 | 266,164 | 148,428
Property, plant and equipment [member] | Deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 5,135,461 | 156,617 | 6,038,258 | 5,916,744
Acquisitions through Business Combinations | 92,842 | 2,831 | 10,410 |
Recognized in Profit or Loss | (1,573,888) | (47,999) | (902,114) | 63,813
Exchange Differences | 71,505 | 2,181 | (11,093) | 57,701
Balance at December 31 | 3,725,920 | 113,630 | 5,135,461 | 6,038,258
Defined benefit obligation [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 819,307 | 24,986 | 862,434 | 1,188,153
Recognized in Profit or Loss | (149,680) | (4,565) | (68,968) | (123,878)
Recognized in Other Comprehensive Income | (62,170) | (1,896) | (4,844) | (208,482)
Exchange Differences | 57,489 | 1,753 | 30,685 | 6,641
Balance at December 31 | 664,946 | 20,278 | 819,307 | 862,434
Defined benefit obligation [member] | Deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 54,634 | 1,666 |  |
Recognized in Profit or Loss | (35,210) | (1,074) | 27,031 |
Recognized in Other Comprehensive Income | 14 | 0 | (2,630) |
Exchange Differences | (1,151) | (35) | 30,233 |
Balance at December 31 | 18,287 | 557 | 54,634 |
Mandatorily at fair value through profit or loss [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 251,890 | 7,682 | 207,794 | 189,350
Recognized in Profit or Loss | (87,612) | (2,672) | 43,792 | 18,192
Exchange Differences | (393) | (12) | 304 | 252
Balance at December 31 | 163,885 | 4,998 | 251,890 | 207,794
Mandatorily at fair value through profit or loss [member] | Deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 45,081 | 1,375 | 531,811 | 12,580
Recognized in Profit or Loss | 823,904 | 25,127 | (487,098) | 519,142
Exchange Differences | (237) | (7) | 368 | 89
Balance at December 31 | 868,748 | 26,495 | 45,081 | 531,811
Other temporary differences [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 4,182,316 | 127,549 | 3,769,504 | 2,870,714
Acquisitions through Business Combinations | 16,067 | 490 | 893 |
Recognized in Profit or Loss | 347,938 | 10,611 | 316,527 | 718,909
Exchange Differences | (233,039) | (7,107) | 95,392 | 179,881
Balance at December 31 | 4,313,282 | 131,543 | 4,182,316 | 3,769,504
Other temporary differences [member] | Deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 2,468,470 | 75,281 | 2,015,063 | 1,660,873
Acquisitions through Business Combinations |  | 0 | 99,535 |
Recognized in Profit or Loss | (24,713) | (754) | 681 | 617,767
Recognized in Other Comprehensive Income | 19,973 | 609 | 268,196 | (370,091)
Exchange Differences | (226,581) | (6,910) | 84,995 | 106,514
Balance at December 31 | 2,237,149 | 68,226 | 2,468,470 | 2,015,063
Temporary differences [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 5,519,677 | 168,334 | 4,988,160 | 4,339,194
Acquisitions through Business Combinations | 139,763 | 4,262 | 893 |
Recognized in Profit or Loss | 74,294 | 2,266 | 401,604 | 653,721
Recognized in Other Comprehensive Income | (62,170) | (1,896) | (4,844) | (208,482)
Exchange Differences | (174,899) | (5,334) | 133,864 | 203,727
Balance at December 31 | 5,496,665 | 167,632 | 5,519,677 | 4,988,160
Unused tax losses [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 555,297 | 16,935 | 495,485 | 638,782
Acquisitions through Business Combinations | 14,058 | 429 |  |
Recognized in Profit or Loss | 250,063 | 7,626 | 56,005 | (166,121)
Exchange Differences | (74,040) | (2,258) | 3,807 | 22,824
Balance at December 31 | 745,378 | 22,732 | 555,297 | 495,485
Unused tax credits [member] | Deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Balance at January 1 | 320,621 | 9,778 | 858,127 | 391,034
Recognized in Profit or Loss | 558,641 | 17,037 | (522,852) | 452,656
Exchange Differences | 54,066 | 1,649 | (14,654) | 14,437
Balance at December 31 | $ 933,328 | $ 28,464 | $ 320,621 | $ 858,127

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