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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | $ 27,711,771 |  |  |
Additions | 1,069,866 | $ 38,568 | $ 982,655 | $ 1,350,908
Amortization expense | 4,054,120 | 146,147 | 3,733,377 | 3,576,606
Ending balance | 24,563,707 | 885,498 | 27,711,771 |
Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 40,355,771 | 1,454,787 | 36,993,875 | 36,988,694
Additions | 1,233,019 | 44,449 | 982,655 | 1,350,908
Disposals or derecognization | (324,321) | (11,692) | (70,007) | (2,045,396)
Disposal of subsidiaries | (801,642) | (28,899) | (38,125) |
Acquisition through business combinations | 622 | 23 | 2,567,342 | 752,548
Effect of foreign currency exchange differences | (258,383) | (9,315) | (79,969) | (52,879)
Ending balance | 40,205,066 | 1,449,353 | 40,355,771 | 36,993,875
Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 12,644,000 | 455,803 | 7,969,483 | 6,150,661
Amortization expense | 4,054,120 | 146,147 | 3,733,377 | 3,576,606
Disposals or derecognization | (310,285) | (11,185) | (52,389) | (2,038,462)
Disposal of subsidiaries | (634,693) | (22,880) | (10,688) |
Acquisition through business combinations | 222 | 8 | 1,026,187 | 321,187
Effect of foreign currency exchange differences | (112,005) | (4,038) | (21,970) | (40,509)
Ending balance | 15,641,359 | 563,855 | 12,644,000 | 7,969,483
Customer relationships [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 9,120,300 |  |  |
Ending balance | 7,990,956 | 288,066 | 9,120,300 |
Customer relationships [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 11,890,283 | 428,633 | 11,000,001 | 11,915,636
Disposals or derecognization | (102,637) | (3,700) |  | (915,635)
Acquisition through business combinations |  |  | 885,565 |
Effect of foreign currency exchange differences | (83,041) | (2,994) | 4,717 |
Ending balance | 11,704,605 | 421,939 | 11,890,283 | 11,000,001
Customer relationships [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 2,769,983 | 99,855 | 1,666,668 | 1,548,839
Amortization expense | 1,049,759 | 37,843 | 1,000,000 | 1,033,464
Disposals or derecognization | (102,637) | (3,700) |  | (915,635)
Acquisition through business combinations |  |  | 102,768 |
Effect of foreign currency exchange differences | (3,456) | (125) | 547 |
Ending balance | 3,713,649 | 133,873 | 2,769,983 | 1,666,668
Computer software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 2,795,873 |  |  |
Ending balance | 2,779,723 | 100,206 | 2,795,873 |
Computer software [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 6,966,449 | 251,134 | 4,606,878 | 4,401,045
Additions | 1,193,060 | 43,009 | 951,439 | 1,358,533
Disposals or derecognization | (150,670) | (5,432) | (55,413) | (1,123,446)
Disposal of subsidiaries | (789,998) | (28,479) | (38,125) |
Acquisition through business combinations | 622 | 23 | 1,567,508 | 19,944
Effect of foreign currency exchange differences | (167,769) | (6,048) | (65,838) | (49,198)
Ending balance | 7,051,694 | 254,207 | 6,966,449 | 4,606,878
Computer software [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 4,170,576 | 150,345 | 2,677,339 | 3,241,363
Amortization expense | 971,190 | 35,010 | 729,330 | 583,300
Disposals or derecognization | (139,907) | (5,043) | (47,345) | (1,116,512)
Disposal of subsidiaries | (626,338) | (22,579) | (10,688) |
Acquisition through business combinations | 222 | 8 | 843,746 | 7,765
Effect of foreign currency exchange differences | (103,772) | (3,741) | (21,806) | (38,577)
Ending balance | 4,271,971 | 154,000 | 4,170,576 | 2,677,339
Patents and acquired specific technology [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 15,720,213 |  |  |
Ending balance | 13,730,404 | 494,968 | 15,720,213 |
Patents and acquired specific technology [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 21,319,179 | 768,536 | 21,318,696 | 20,588,356
Additions | 2,000 | 72 | 171 |
Disposal of subsidiaries | (5,401) | (195) |  |
Acquisition through business combinations |  |  |  | 732,604
Effect of foreign currency exchange differences | (537) | (19) | 312 | (2,264)
Ending balance | 21,315,241 | 768,394 | 21,319,179 | 21,318,696
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 5,598,966 | 201,837 | 3,600,173 | 1,332,687
Amortization expense | 1,991,641 | 71,797 | 1,998,554 | 1,955,703
Disposal of subsidiaries | (5,288) | (191) |  |
Acquisition through business combinations |  |  |  | 313,422
Effect of foreign currency exchange differences | (482) | (17) | 239 | (1,639)
Ending balance | 7,584,837 | 273,426 | 5,598,966 | 3,600,173
Others [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 75,385 |  |  |
Ending balance | 62,624 | 2,258 | 75,385 |
Others [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 179,860 | 6,484 | 68,300 | 83,657
Additions | 37,959 | 1,368 | 31,045 | 7,625
Disposals or derecognization | (71,014) | (2,560) | (14,594) | (6,315)
Disposal of subsidiaries | (6,243) | (225) |  |
Acquisition through business combinations |  |  | 114,269 |
Effect of foreign currency exchange differences | (7,036) | (254) | (19,160) | (1,417)
Ending balance | 133,526 | 4,813 | 179,860 | 68,300
Others [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 104,475 | 3,766 | 25,303 | 27,772
Amortization expense | 41,530 | 1,497 | 5,493 | 4,139
Disposals or derecognization | (67,741) | (2,442) | (5,044) | (6,315)
Disposal of subsidiaries | (3,067) | (110) |  |
Acquisition through business combinations |  |  | 79,673 |
Effect of foreign currency exchange differences | (4,295) | (155) | (950) | (293)
Ending balance | $ 70,902 | $ 2,556 | $ 104,475 | $ 25,303

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