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Borrowings - Summary of Short Term Borrowings (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: financial liabilities for hedging - current $ (5,277,325) $ (187,939) $ (3,233,301)
Short-term borrowings 31,290,839 1,114,346 37,339,028
Short Term Bank Loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Secured bank loans, annual interest rate was 0.90%-1.87% as of December 31, 2020 300,495 10,701  
Unsecured bank loans, annual interest rates were 0.70%-5.40% and 0.58%-3.83% as of December 31, 2019 and 2020, respectively 34,297,362 1,221,416 40,572,329
Borrowings 34,597,857 1,232,117 40,572,329
Less: financial liabilities for hedging - current 3,307,018 117,771 3,233,301
Short-term borrowings $ 31,290,839 $ 1,114,346 $ 37,339,028