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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 ($)
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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

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