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Significant Assets and Liabilities Denominated in Foreign Currencies - Summary of Realized and Unrealized Foreign Exchange Gain (Loss) (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ (5,641,792) | $ (172,058) | $ 980,313 | $ (2,410,464)
US Dollar [member] | US dollar equals to New Taiwan dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Exchange Rate | US$1=NT$32.785 | US$1=NT$32.785 | US$1=NT$30.705 | US$1=NT$30.71
Net Foreign Exchange Gain (Loss) | $ (937,503) | $ (28,591) | $ 162,827 | $ (347,044)
New Taiwan Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ (4,826,783) | $ (147,203) | $ 822,098 | $ (2,985,318)
Chinese Yuan [member] | Chinese Yuan equals to New Taiwan dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Exchange Rate | RMB1=NT$4.5608 | RMB1=NT$4.5608 | RMB1=NT$4.3352 | RMB1=NT$4.4094
Net Foreign Exchange Gain (Loss) | $ 122,494 | $ 3,736 | $ (4,612) | $ 921,898

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