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Financial Instruments - Summary of Detailed Information about Maturity Analysis of Obligation under Leases (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Less than 1 year [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 1,154,737 | $ 35,216 | $ 1,227,705
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 146,133,980 | 4,456,663 | 106,829,736
1-5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 2,676,514 | 81,626 | 2,867,502
5 to 10 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,964,781 | 59,920 | 2,157,503
10 to 15 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 951,983 | 29,033 | 891,614
15 to 20 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 917,034 | 27,967 | 864,881
More than 20 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 1,738,240 | $ 53,011 | $ 1,591,097

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