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Segment Information - Geographic Information of Revenue (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 geographical areas [Line Items] |  |  |  |
Revenue | $ 22,695,909 | $ 692,159 | $ 21,356,228 | $ 23,517,064
ROC [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 18,079,388 |  | 17,287,574 | 18,671,142
Japan [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,352,192 |  | 1,176,163 | 1,989,805
People's Republic of China ("PRC") [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,683,358 |  | 1,729,908 | 1,970,943
Singapore [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 981,329 |  | 676,088 | 390,488
Others [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 599,642 |  | $ 486,495 | $ 494,686

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