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Borrowings - Summary of Bank Loans (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: current portion $ 4,526,683 $ 163,183 $ 2,250,121
Financial liabilities for hedging - current 6,716,965 242,140 5,277,325
Noncurrent portion 117,164,876 4,223,680 102,259,378
Bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 117,973,843 4,252,843 107,392,223
Less: current portion 4,526,683 163,183 2,250,121
Financial liabilities for hedging - current 0 0 1,970,307
Financial liabilities for hedging - non-current 4,780,931 172,348 5,910,919
Noncurrent portion 108,666,229 3,917,312 97,260,876
Bank loans [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 117,977,485 4,252,974 107,496,546
Bank loans [member] | Cost [member] | Syndicated bank loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 2,562,926 92,391 12,536,424
Bank loans [member] | Cost [member] | Other loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 107,383,417 3,871,068 84,146,125
Bank loans [member] | Cost [member] | Mortgage loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 8,031,142 289,515 10,813,997
Bank loans [member] | Net Unamortized Debt Issue Costs [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings $ 3,642 $ 131 $ 104,323