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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | $ 30,897,700 |  |  |
Additions | 1,350,908 | $ 45,166 | $ 537,659 | $ 277,825
Amortization expense | 3,576,606 | 119,579 | 2,402,450 | 457,666
Ending balance | 29,024,392 | 970,391 | 30,897,700 |
Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 36,988,694 | 1,236,666 | 5,190,328 | 5,174,700
Additions | 1,350,908 | 45,166 | 537,659 | 277,825
Disposals or derecognization | (2,045,396) | (68,385) | (99,589) | (212,317)
Acquisition through business combinations | 752,548 | 25,161 | 31,507,668 |
Effect of foreign currency exchange differences | (52,879) | (1,768) | 4,969 | (49,880)
Ending balance | 36,993,875 | 1,236,840 | 36,988,694 | 5,190,328
Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 37,141,035 | 1,241,759 |  |
Ending balance |  |  | 37,141,035 |
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | (152,341) | (5,093) |  |
Ending balance |  |  | (152,341) |
Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 6,150,661 | 205,639 | 3,783,463 | 3,557,439
Amortization expense | 3,576,606 | 119,579 | 2,402,450 | 457,666
Disposals or derecognization | (2,038,462) | (68,153) | (99,433) | (196,224)
Acquisition through business combinations | 321,187 | 10,739 | 153,282 |
Effect of foreign currency exchange differences | (40,509) | (1,355) | 3,573 | (35,418)
Ending balance | 7,969,483 | 266,449 | 6,150,661 | 3,783,463
Accumulated depreciation and amortization [Member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 6,243,335 | 208,738 |  |
Ending balance |  |  | 6,243,335 |
Accumulated depreciation and amortization [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | (92,674) | (3,099) |  |
Ending balance |  |  | (92,674) |
Customer relationships [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 10,366,797 |  |  |
Ending balance | 9,333,333 | 312,047 | 10,366,797 |
Customer relationships [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 11,915,636 | 398,383 | 915,636 | 915,636
Disposals or derecognization | (915,635) | (30,613) |  |
Acquisition through business combinations |  |  | 11,000,000 |
Ending balance | 11,000,001 | 367,770 | 11,915,636 | 915,636
Customer relationships [Member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 11,915,636 | 398,383 |  |
Ending balance |  |  | 11,915,636 |
Customer relationships [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,548,839 | 51,783 | 801,860 | 721,547
Amortization expense | 1,033,464 | 34,553 | 746,979 | 80,313
Disposals or derecognization | (915,635) | (30,613) |  |
Ending balance | 1,666,668 | 55,723 | 1,548,839 | 801,860
Customer relationships [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,548,839 | 51,783 |  |
Ending balance |  |  | 1,548,839 |
Computer software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,159,682 |  |  |
Ending balance | 1,929,539 | 64,511 | 1,159,682 |
Computer software [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 4,401,045 | 147,143 | 3,686,452 | 3,552,229
Additions | 1,358,533 | 45,421 | 528,883 | 265,497
Disposals or derecognization | (1,123,446) | (37,561) | (95,358) | (83,595)
Acquisition through business combinations | 19,944 | 667 | 274,868 |
Effect of foreign currency exchange differences | (49,198) | (1,645) | 6,200 | (47,679)
Ending balance | 4,606,878 | 154,025 | 4,401,045 | 3,686,452
Computer software [Member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 4,401,045 | 147,143 |  |
Ending balance |  |  | 4,401,045 |
Computer software [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 3,241,363 | 108,371 | 2,822,121 | 2,608,702
Amortization expense | 583,300 | 19,502 | 373,536 | 316,580
Disposals or derecognization | (1,116,512) | (37,329) | (95,202) | (72,481)
Acquisition through business combinations | 7,765 | 260 | 137,799 |
Effect of foreign currency exchange differences | (38,577) | (1,290) | 3,109 | (30,680)
Ending balance | 2,677,339 | 89,514 | 3,241,363 | 2,822,121
Computer software [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 3,241,363 | 108,371 |  |
Ending balance |  |  | 3,241,363 |
Patents and acquired specific technology [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 19,255,669 |  |  |
Ending balance | 17,718,523 | 592,395 | 19,255,669 |
Patents and acquired specific technology [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 20,588,356 | 688,343 | 389,486 | 514,443
Disposals or derecognization |  |  | (231) | (123,744)
Acquisition through business combinations | 732,604 | 24,494 | 20,200,000 |
Effect of foreign currency exchange differences | (2,264) | (76) | (899) | (1,213)
Ending balance | 21,318,696 | 712,761 | 20,588,356 | 389,486
Patents and acquired specific technology [Member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 20,588,356 | 688,343 |  |
Ending balance |  |  | 20,588,356 |
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,332,687 | 44,557 | 70,084 | 155,216
Amortization expense | 1,955,703 | 65,386 | 1,263,309 | 43,493
Disposals or derecognization |  |  | (231) | (123,743)
Acquisition through business combinations | 313,422 | 10,479 |  |
Effect of foreign currency exchange differences | (1,639) | (55) | (475) | (4,882)
Ending balance | 3,600,173 | 120,367 | 1,332,687 | 70,084
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 1,332,687 | 44,557 |  |
Ending balance |  |  | 1,332,687 |
Others [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 115,552 |  |  |
Ending balance | 42,997 | 1,438 | 115,552 |
Others [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 83,657 | 2,797 | 198,754 | 192,392
Additions | (7,625) | (255) | 8,776 | 12,328
Disposals or derecognization | (6,315) | (211) | (4,000) | (4,978)
Acquisition through business combinations |  |  | 32,800 |
Effect of foreign currency exchange differences | (1,417) | (47) | (332) | (988)
Ending balance | 68,300 | 2,284 | 83,657 | 198,754
Others [Member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 235,998 | 7,890 |  |
Ending balance |  |  | 235,998 |
Others [Member] | Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | (152,341) | (5,093) |  |
Ending balance |  |  | (152,341) |
Others [Member] | Accumulated depreciation and amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 27,772 | 928 | 89,398 | 71,974
Amortization expense | 4,139 | 138 | 18,626 | 17,280
Disposals or derecognization | (6,315) | (211) | (4,000) |
Acquisition through business combinations |  |  | 15,483 |
Effect of foreign currency exchange differences | (293) | (10) | 939 | 144
Ending balance | 25,303 | 845 | 27,772 | $ 89,398
Others [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | 120,446 | 4,027 |  |
Ending balance |  |  | 120,446 |
Others [Member] | Accumulated depreciation and amortization [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning balance | $ (92,674) | $ (3,099) |  |
Ending balance |  |  | $ (92,674) |

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