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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ 1,460,876 | $ 52,663 | $ 1,056,639 | $ 1,133,701
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$27.68 | US$1=NT$27.68 | US$1=NT$28.48 | US$1=NT$29.98
Net Foreign Exchange Gain (Loss) | $ 132,582 | $ 4,780 | $ (143,804) | $ (84,177)
New Taiwan Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net Foreign Exchange Gain (Loss) | $ 1,413,969 | $ 50,972 | $ 1,382,067 | $ 1,203,823
Chinese Yuan [member] | Chinese Yuan equals to New Taiwan dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Exchange Rate | RMB1=NT$4.3415 | RMB1=NT$4.3415 | RMB1=NT$4.3648 | RMB1=NT$4.2975
Net Foreign Exchange Gain (Loss) | $ (85,675) | $ (3,089) | $ (181,624) | $ 14,055

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