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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail) - TWD ($) $ in Thousands | 1 Months Ended | 2 Months Ended
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Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2021
FAFG [member] |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |
Operating revenue | $ 2,043,440 |  |
Net Profit (loss) | $ 91,179 |  |
ITGEU |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |
Operating revenue |  | $ 75,221 |
Net Profit (loss) |  | $ (4,593) |
SER [Member] |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |
Operating revenue |  |  | $ 225,017
Net Profit (loss) |  |  | $ (508)

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