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Business Combinations - Summary of Goodwill Recognized on Acquisitions (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
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Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Goodwill | $ 52,313,399 | $ 1,702,356 | $ 52,072,413 | $ 1,694,514 | $ 52,709,053 | $ 50,198,436
FAFG [member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 12,443,637 |  |  |  |  |
Add: Non-controlling interests | 289 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | (9,876,084) |  |  |  |  |
Goodwill | 2,567,842 |  |  |  |  |
ITGEU |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 50,368 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | (83,482) |  |  |  |  |
Goodwill | (33,114) |  |  |  |  |
SER [Member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 217,919 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | $ (217,919) |  |  |  |  |

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