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Goodwill - Summary of Carrying Amounts of Goodwill Allocated to Cash-generating Units (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | $ 52,072,413 | $ 1,877,160 | $ 52,709,053 | $ 1,900,110 | $ 50,198,436 | $ 49,974,446
Packaging segment [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 35,412,424 | 1,276,583 | 35,703,625 |  |  |
Testing segment [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 13,304,040 | 479,598 | 13,365,068 |  |  |
EMS Segment Member [Member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 3,207,848 | 115,640 | 3,492,259 |  |  |
All other segments [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | $ 148,101 | $ 5,339 | $ 148,101 |  |  |

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