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Business Combinations - Summary of Goodwill Recognized on Acquisitions (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 detailed information about business combination [Line Items] |  |  |  |  |  |
Goodwill | $ 52,072,413 | $ 1,877,160 | $ 52,709,053 | $ 1,900,110 | $ 50,198,436 | $ 49,974,446
AMPI [member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 250,000 |  |  |  |  |
Add: Fair value of investments previously owned | 315,925 |  |  |  |  |
Add: Non-controlling interests | 416,716 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | (849,863) |  |  |  |  |
Goodwill | 132,778 |  |  |  |  |
ASEEE [member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 0 |  |  |  |  |
Add: Fair value of investments previously owned | 117,609 |  |  |  |  |
Add: Non-controlling interests | 105,464 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | (215,233) |  |  |  |  |
Goodwill | 7,840 |  |  |  |  |
USIPL [member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 313,057 |  |  |  |  |
Add: Fair value of investments previously owned | 0 |  |  |  |  |
Add: Non-controlling interests | 142,494 |  |  |  |  |
Less: Fair value of identifiable net assets acquired | (331,192) |  |  |  |  |
Goodwill | 124,359 |  |  |  |  |
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 | 1,816 |  |  |  |
Less: Fair value of identifiable net assets acquired | (83,482) | (3,009) |  |  |  |
Goodwill | 33,114 | 1,193 |  |  |  |
SER [Member] |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |
Total consideration | 217,919 | 7,856 |  |  |  |
Less: Fair value of identifiable net assets acquired | $ (217,919) | $ (7,856) |  |  |  |

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