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Segment Information - Geographic Information of Revenue (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 21,356,228 | $ 697,460 | $ 23,517,064 | $ 27,400,035
ROC [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 17,287,574 |  | 18,671,142 | 21,608,567
Japan [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,176,163 |  | 1,989,805 | 1,768,460
People's Republic of China ("PRC") [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,729,908 |  | 1,970,943 | 1,899,362
Singapore [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 676,088 |  | 390,488 | 1,630,733
Others [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 486,495 |  | $ 494,686 | $ 492,913

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