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Operating Segments Information - Summary of Revenue from Major Products and Services (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 products and services [line items] |  |  |  |
Operating revenue | $ 569,997,133 | $ 20,547,842 | $ 476,978,710 | $ 413,182,184
Packaging service [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Operating revenue | 272,543,899 | 9,824,942 | 218,666,071 | 198,916,897
Testing service [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Operating revenue | 49,978,736 | 1,801,685 | 47,271,074 | 42,658,686
EMS |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Operating revenue | 239,488,267 | 8,633,319 | 204,690,669 | 165,789,479
Other products and services [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Operating revenue | $ 7,986,231 | $ 287,896 | $ 6,350,896 | $ 5,817,122

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