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Financial Instruments - Summary of Detailed Information About Hedges (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current $ 6,716,965 $ 242,140 $ 5,277,325
Fair value hedge of borrowings denominated in foreign currencies [member]      
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current 2,954,921 106,522 3,307,018
Current Financial Assets For Hedging – current 0 0 0
Hedges of net investment in foreign operations [member]      
Disclosure of detailed information about hedges [line items]      
Financial liabilities for hedging – current 3,762,044 135,618 1,970,307
Financial liabilities for hedging – non-current 4,780,931 172,348 5,910,919
Current Financial Assets For Hedging – current 0 0 0
Non Current Financial Assets For Hedging – non-current $ 0 $ 0 $ 0