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Financial Instruments - Summary of Detailed Information About Hedges Items (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2022
USD ($)
Borrowings denominated in foreign currencies [member]        
Disclosure of detailed information about hedged items [line items]        
Hedged item, assets $ 2,282,243   $ 2,318,517 $ 74,568
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 (323,884) $ (10,540) 94,145  
Hedged item, assets 323,884   (94,145) 10,540
Accumulated Amount of Fair Value Hedge Adjustments on Hedged Item, Asset 87,522   (236,362) 2,848
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 (509,229) $ (16,571) (738,600)  
Hedged item, assets 509,229   738,600 16,571
Accumulated Gains or Losses in Other Equity, Continuing Hedges $ 673,005   $ 163,776 $ 21,901