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Investments Accounted for Using the Equity Method - Summary of Investments in Associates Accounted for Using the Equity Method (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates | $ 20,410,983 | $ 19,662,937 | $ 622,476
Yann Yuan Investment Co., Ltd. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in investing activities |  |
Operating Location | R.O.C. |  |
Investments in associates before deferred gain on transfer of land | $ 10,317,044 | $ 10,250,888 | 314,640
Percentages of ownership held by the Group | 27.94% | 27.94% |
ChipMOS Technologies Inc. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in the packaging and testing of semiconductors |  |
Operating Location | R.O.C. |  |
Investments in associates before deferred gain on transfer of land | $ 2,941,982 | $ 2,786,339 | 89,722
Percentages of ownership held by the Group | 10.85% | 10.85% |
Hung Ching Development & Construction Co. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in the development, construction and leasing of real estate properties |  |
Operating Location | R.O.C. |  |
Investments in associates before deferred gain on transfer of land | $ 2,412,818 | $ 2,035,230 | 73,584
Percentages of ownership held by the Group | 26.22% | 26.22% |
M-Universe Investments Pte. Ltd. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Investment company |  |
Operating Location | Singapore |  |
Investments in associates before deferred gain on transfer of land | $ 2,325,475 | $ 2,072,314 | 70,920
Percentages of ownership held by the Group | 42.23% | 42.23% |
MACHVISION Inc [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in the manufacturing and trading of non-contact optical inspection equipment |  |
Operating Location | R.O.C. |  |
Investments in associates before deferred gain on transfer of land | $ 2,055,590 | $ 2,123,368 | 62,690
Percentages of ownership held by the Group | 23.08% | 23.08% |
CHIPLETZ [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Fabless substrate design house |  |
Operating Location | U.S.A. |  |
Percentages of ownership held by the Group | 18.74% | 19.43% |
Hung Ching Kwan Co. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in the leasing of real estate properties |  |
Operating Location | R.O.C. |  |
Percentages of ownership held by the Group | 27.31% | 27.31% |
QUESTYLE [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Engaged in the research and development on technology and sales of electronic products, digital products, audio equipment and spare parts, domestic trading; import and export business |  |
Operating Location | China |  |
Percentages of ownership held by the Group | 6.67% | 6.67% |
Deca Technologies Inc. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Holding company with group engaged in the development of wafer level packaging |  |
Operating Location | U.S.A. |  |
Percentages of ownership held by the Group | 17.84% | 17.84% |
Goodcare Holdings Inc [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Holding company, engaged in operation investment, long-term care and home services business |  |
Operating Location | R.O.C. |  |
Percentages of ownership held by the Group | 49.00% | 49.00% |
Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates | $ 20,327,885 | $ 19,595,234 | 619,942
Cost [member] | CHIPLETZ [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 255,384 | 248,209 | 7,788
Cost [member] | Hung Ching Kwan Co. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | (83,098) | (67,703) | (2,534)
Cost [member] | QUESTYLE [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 17,798 | 72,421 | 543
Cost [member] | Deca Technologies Inc. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 58,100 | 53,357 | 1,772
Cost [member] | Goodcare Holdings Inc [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 26,792 | 20,811 | 817
Deferred gain on transfer of land [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates | $ 83,098 | $ 67,703 | $ 2,534

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