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Other Intangible Assets - Summary of Carrying Amounts of Each Class of Other Intangible Assets (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | $ 17,820,133 |  |  |
Amortization expense | 3,820,014 | $ 116,499 | $ 3,906,483 | $ 3,931,079
Ending balance | 15,692,350 | 478,571 | 17,820,133 |
Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 40,457,546 | 1,233,838 | 40,825,968 | 40,205,066
Additions | 1,670,252 | 50,938 | 527,786 | 491,868
Disposals or derecognition | (335,661) | (10,237) | (936,920) | (50,313)
Acquisition through business combinations | 39,828 | 1,215 |  |
Effect of foreign currency exchange differences | 123,671 | 3,772 | 40,712 | 179,347
Ending balance | 41,955,636 | 1,279,526 | 40,457,546 | 40,825,968
Accumulated depreciation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 22,637,413 | 690,376 | 19,648,260 | 15,641,359
Amortization expense | 3,820,014 | 116,499 | 3,906,483 | 3,931,079
Impairment losses recognized |  |  |  | 715
Disposals or derecognition | (328,214) | (10,009) | (923,567) | (40,009)
Acquisition through business combinations | 38,515 | 1,175 |  |
Effect of foreign currency exchange differences | 95,558 | 2,914 | 6,237 | 115,116
Ending balance | 26,263,286 | 800,955 | 22,637,413 | 19,648,260
Customer relationships [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 5,949,623 |  |  |
Ending balance | 4,904,110 | 149,561 | 5,949,623 |
Customer relationships [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 11,762,561 | 358,724 | 11,736,181 | 11,704,605
Disposals or derecognition |  |  | 0 | 0
Effect of foreign currency exchange differences | 2,951 | 90 | 26,380 | 31,576
Ending balance | 11,765,512 | 358,814 | 11,762,561 | 11,736,181
Customer relationships [Member] | Accumulated depreciation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 5,812,938 | 177,278 | 4,761,816 | 3,713,649
Amortization expense | 1,048,694 | 31,982 | 1,047,282 | 1,043,852
Disposals or derecognition |  |  | 0 | 0
Effect of foreign currency exchange differences | (230) | (7) | 3,840 | 4,315
Ending balance | 6,861,402 | 209,253 | 5,812,938 | 4,761,816
Computer software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,878,509 |  |  |
Ending balance | 2,612,829 | 79,684 | 1,878,509 |
Computer software [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 7,260,393 | 221,421 | 7,616,109 | 7,051,694
Additions | 1,597,759 | 48,727 | 537,261 | 459,954
Disposals or derecognition | (325,476) | (9,926) | (905,947) | (37,442)
Acquisition through business combinations | 39,828 | 1,215 |  |
Effect of foreign currency exchange differences | 121,122 | 3,694 | 12,970 | 141,903
Ending balance | 8,693,626 | 265,131 | 7,260,393 | 7,616,109
Computer software [Member] | Accumulated depreciation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 5,381,884 | 164,132 | 5,305,294 | 4,271,971
Amortization expense | 886,727 | 27,042 | 970,413 | 957,708
Impairment losses recognized |  |  |  | 715
Disposals or derecognition | (319,368) | (9,739) | (894,767) | (31,456)
Acquisition through business combinations | 38,515 | 1,175 |  |
Effect of foreign currency exchange differences | 93,039 | 2,837 | 944 | 106,356
Ending balance | 6,080,797 | 185,447 | 5,381,884 | 5,305,294
Patents and acquired specific technology [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 9,948,539 |  |  |
Ending balance | 8,069,574 | 246,098 | 9,948,539 |
Patents and acquired specific technology [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 21,317,895 | 650,134 | 21,317,352 | 21,315,241
Additions |  |  | 1,350 | 500
Disposals or derecognition | (8,846) | (270) |  |
Effect of foreign currency exchange differences | 2,451 | 75 | (807) | 1,611
Ending balance | 21,311,500 | 649,939 | 21,317,895 | 21,317,352
Patents and acquired specific technology [Member] | Accumulated depreciation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 11,369,356 | 346,733 | 9,488,185 | 7,584,837
Amortization expense | 1,878,965 | 57,303 | 1,881,980 | 1,901,835
Disposals or derecognition | (8,846) | (270) | 0 |
Effect of foreign currency exchange differences | 2,451 | 75 | (809) | 1,513
Ending balance | 13,241,926 | 403,841 | 11,369,356 | 9,488,185
Others [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 43,462 |  |  |
Ending balance | 105,837 | 3,228 | 43,462 |
Others [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 116,697 | 3,559 | 156,326 | 133,526
Additions | 72,493 | 2,211 | (10,825) | 31,414
Disposals or derecognition | (1,339) | (41) | (30,973) | (12,871)
Effect of foreign currency exchange differences | (2,853) | (87) | 2,169 | 4,257
Ending balance | 184,998 | 5,642 | 116,697 | 156,326
Others [Member] | Accumulated depreciation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 73,235 | 2,233 | 92,965 | 70,902
Amortization expense | 5,628 | 172 | 6,808 | 27,684
Disposals or derecognition |  |  | (28,800) | (8,553)
Effect of foreign currency exchange differences | 298 | 9 | 2,262 | 2,932
Ending balance | $ 79,161 | $ 2,414 | $ 73,235 | $ 92,965

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