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Financial Instruments - Summary of Financial Assets Measured at Level 3 Fair Value (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 fair value measurement of assets [line items] |  |  |  |
Beginning Balance | $ 584,152,644 |  |  |
Net increase in trade receivables | (27,957,812) | $ (1,007,852) | $ (9,396,304) | $ 995,839
Exercise of call option | (2,727,915) | (98,339) | (1,934,530) | (1,149,227)
Ending Balance | 673,265,899 | 24,270,582 | 584,152,644 |
Available-for-sale [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 4,265,531 | 153,767 | 4,806,179 | 2,072,446
Recognized in profit or loss | 131,276 | 4,732 | (17,941) | 3,431
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) | 193,448 | 6,974 | (151,992) | (218,173)
Recognized in other comprehensive income (effects of foreign currency exchange) | (84,122) | (3,033) | (31,017) | (20,063)
Net increase in trade receivables | 18,210,321 | 656,464 | 6,005,816 | 3,171,205
Trade receivables factoring (purchases) | (12,744,272) | (459,418) | (7,409,093) | (1,141,515)
Purchases | 491,292 | 17,711 | 1,152,402 | 951,513
Disposals | (122,666) | (4,422) | (450,625) | (12,665)
Exercise of call option |  |  | (25,988) |
Reclassify | (29,758) | (1,073) |  |
Acquisition through business combinations |  |  | 387,790 |
Ending Balance | 10,311,050 | 371,702 | 4,265,531 | 4,806,179
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | Adjusted [Member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 4,265,531 |  |  |
Ending Balance |  |  | 4,265,531 |
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 1,897,984 | 68,421 | 1,005,714 | 475,123
Recognized in profit or loss | 131,276 | 4,732 | (17,941) | 3,431
Recognized in other comprehensive income (effects of foreign currency exchange) | (79,614) | (2,870) | (15,455) | (14,368)
Purchases | 459,046 | 16,548 | 893,234 | 541,528
Disposals | (107,793) | (3,886) | (329,370) |
Exercise of call option |  |  | (25,988) |
Acquisition through business combinations |  |  | 387,790 |
Ending Balance | 2,300,899 | 82,945 | 1,897,984 | 1,005,714
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member] | Adjusted [Member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 1,897,984 |  |  |
Ending Balance |  |  | 1,897,984 |
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL debt instrument [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 0 | 0 | 0 |
Net increase in trade receivables | 3,269,782 | 117,872 | 370,110 |
Trade receivables factoring (purchases) | (3,269,782) | (117,872) | (370,110) |
Ending Balance | 0 | 0 | 0 | 0
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI equity instruments [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 728,398 | 26,257 | 755,903 | 580,399
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) | 129,726 | 4,677 | (149,856) | (216,121)
Recognized in other comprehensive income (effects of foreign currency exchange) | (4,508) | (163) | (15,562) | (5,695)
Purchases | 32,246 | 1,163 | 259,168 | 409,985
Disposals | (14,873) | (536) | (121,255) | (12,665)
Reclassify | (29,758) | (1,073) |  |
Ending Balance | 841,231 | 30,325 | 728,398 | 755,903
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI debt instruments [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 1,639,149 | 59,089 | 3,044,562 | 1,016,924
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) | 63,722 | 2,297 | (2,136) | (2,052)
Net increase in trade receivables | 14,940,539 | 538,592 | 5,635,706 | 3,171,205
Trade receivables factoring (purchases) | (9,474,490) | (341,546) | (7,038,983) | (1,141,515)
Ending Balance | $ 7,168,920 | $ 258,432 | $ 1,639,149 | $ 3,044,562

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