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Borrowings - Summary of Bank Loans (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: current portion $ 2,250,121 $ 80,133 $ 5,112,768
Financial liabilities for hedging - current 5,277,325 187,939 3,233,301
Noncurrent portion 102,259,378 3,641,716 135,965,830
Bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 107,392,223 3,824,510 130,085,354
Less: current portion 2,250,121 80,133 5,017,970
Financial liabilities for hedging - current 1,970,307 70,168  
Financial liabilities for hedging - non-current 5,910,919 210,503  
Noncurrent portion 97,260,876 3,463,706 125,067,384
Bank loans [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 107,496,546 3,828,225 130,095,646
Bank loans [member] | Cost [member] | Syndicated bank loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 12,536,424 446,454 20,000,000
Bank loans [member] | Cost [member] | Other loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 84,146,125 2,996,657 105,214,824
Bank loans [member] | Cost [member] | Mortgage loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 10,813,997 385,114 4,880,822
Bank loans [member] | Net Unamortized Debt Issue Costs [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings $ 104,323 $ 3,715 $ 10,292