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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 2 Months Ended | 8 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 TWD ($)
AMPI [member] |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue |  |  |  | $ 704,243 |
Net Profit (loss) |  |  |  | $ (217,163) |
ASEEE [member] |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue |  |  |  |  | $ 1,159
Net Profit (loss) |  |  |  |  | $ (469,598)
FAFG [member] |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue | $ 2,043,440 |  |  |  |
Net Profit (loss) | $ 91,179 |  |  |  |
USIPL [member] |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue |  | $ 39,080 |  |  |
Net Profit (loss) |  | (11,995) |  |  |
ITGEU |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue |  | 75,221 | $ 2,712 |  |
Net Profit (loss) |  | (4,593) | (166) |  |
SER [Member] |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |
Operating revenue |  | 225,017 | 8,112 |  |
Net Profit (loss) |  | $ (508) | $ (18) |  |

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