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Financial Instruments - Summary of Detailed Information About Hedges Items (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
USD ($)
Borrowings denominated in foreign currencies [member]        
Disclosure of detailed information about hedged items [line items]        
Hedged item, assets $ 2,834,608   $ 2,011,050 $ 86,447
Fair value hedge of borrowings denominated in foreign currencies [member]        
Disclosure of detailed information about hedged items [line items]        
Change in Value Used for Calculating Hedge Ineffectiveness, Hedging Instrument (243,954) $ (7,440) 7,493  
Hedged item, assets 243,954   (7,493) 7,440
Accumulated Amount of Fair Value Hedge Adjustments on Hedged Item, Asset 323,983   80,029 9,881
Hedges of net investment in foreign operations [member]        
Disclosure of detailed information about hedged items [line items]        
Change in Value Used for Calculating Hedge Ineffectiveness, Hedging Instrument (562,598) $ (17,158) 312,029  
Hedged item, assets 562,598   (312,029) 17,158
Accumulated Gains or Losses in Other Equity, Continuing Hedges $ 923,574   $ 360,976 $ 28,166