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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
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