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Financial Instruments - Summary of Detailed Information About Hedges Items (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Borrowings denominated in foreign currencies [member]        
Disclosure of detailed information about hedged items [line items]        
Hedged item, assets $ 2,318,517   $ 2,859,132 $ 83,580
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 94,145 $ 3,394 157,842  
Hedged item, assets (94,145)   (157,842) (3,394)
Accumulated Amount of Fair Value Hedge Adjustments on Hedged Item, Asset (236,362)   (142,217) (8,521)
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 (738,600) $ (26,626) 574,824  
Hedged item, assets 738,600   (574,824) 26,626
Accumulated Gains or Losses in Other Equity, Continuing Hedges $ 163,776   $ (574,824) $ 5,904