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Financial Instruments - Summary of Detailed Information About Hedges (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current $ 5,277,325 $ 187,939 $ 3,233,301
Fair value hedge of borrowings denominated in foreign currencies [member]      
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current 3,307,018 117,771 $ 3,233,301
Current Financial Assets For Hedging – current 0    
Hedges of net investment in foreign operations [member]      
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current 1,970,307 70,168  
Financial liabilities for hedging – non-current 5,910,919 210,503  
Current Financial Assets For Hedging – current 0    
Non Current Financial Assets For Hedging – non-current $ 0 $ 0