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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, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ (2,410,464) | $ (78,440) | $ 1,460,876 | $ 1,056,639
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$30.71 | US$1=NT$30.71 | US$1=NT$27.68 | US$1=NT$28.48
Net Foreign Exchange Gain (Loss) | $ (347,044) | $ (11,293) | $ 132,582 | $ (143,804)
New Taiwan Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ (2,985,318) | $ (97,147) | $ 1,413,969 | $ 1,382,067
Chinese Yuan [member] | Chinese Yuan equals to New Taiwan dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Exchange Rate | RMB1=NT$4.4094 | RMB1=NT$4.4094 | RMB1=NT$4.3415 | RMB1=NT$4.3648
Net Foreign Exchange Gain (Loss) | $ 921,898 | $ 30,000 | $ (85,675) | $ (181,624)

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