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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, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates | $ 16,500,670 | $ 12,335,239 | $ 594,833
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. |  |
Percentages of ownership held by the Group | 29.45% | 32.21% |
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. |  |
Percentages of ownership held by the Group | 10.85% | 10.85% |
M-Universe Investments Pte. Ltd. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Main Business | Investment company |  |
Operating Location | Singapore |  |
Percentages of ownership held by the Group | 42.23% | 42.23% |
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. |  |
Percentages of ownership held by the Group | 26.22% | 26.22% |
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% |
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 and interconnect technology |  |
Operating Location | U.S.A. |  |
Percentages of ownership held by the Group | 17.85% | 17.85% |
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 | 20.82% |  |
Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | $ 16,800,819 | $ 12,635,388 | 605,653
Cost [member] | Yann Yuan Investment Co., Ltd. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 9,873,978 | 6,670,035 | 355,947
Cost [member] | ChipMOS Technologies Inc. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 2,717,250 | 2,406,843 | 97,954
Cost [member] | M-Universe Investments Pte. Ltd. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 1,859,542 | 1,848,588 | 67,035
Cost [member] | Hung Ching Development & Construction Co. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 1,828,921 | 1,352,760 | 65,931
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 | 258,757 | 270,087 | 9,328
Cost [member] | Deca Technologies Inc. [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 51,434 | 87,075 | 1,854
Cost [member] | CHIPLETZ [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates before deferred gain on transfer of land | 210,937 |  | 7,604
Deferred gain on transfer of land [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Investments in associates | $ 300,149 | $ 300,149 | $ 10,820

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