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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, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | $ 673,265,899 |  |  |
Net increase (decrease) in trade receivables | 754,156 | $ 24,541 | $ (27,957,812) | $ (9,396,304)
Exercise of call option | (1,069,255) | (34,795) | (2,727,915) | (1,934,530)
Ending Balance | 707,589,842 | 23,026,029 | 673,265,899 |
Available-for-sale [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 10,311,050 | 335,537 | 4,265,531 | 4,806,179
Recognized in profit or loss | 100,739 | 3,278 | 131,276 | (17,941)
Recognized in other comprehensive income (included in unrealized (losses) gains on financial assets at FVTOCI) | (383,608) | (12,483) | 193,448 | (151,992)
Recognized in other comprehensive income (effects of foreign currency exchange) | 200,973 | 6,540 | (84,122) | (31,017)
Net increase (decrease) in trade receivables | 3,655,963 | 118,971 | 18,210,321 | 6,005,816
Trade receivables factoring (purchases) | (4,345,711) | (141,416) | (12,744,272) | (7,409,093)
Purchases | 372,341 | 12,117 | 491,292 | 1,152,402
Disposals | (346,181) | (11,266) | (122,666) | (450,625)
Exercise of call option |  |  |  | (25,988)
Reclassify |  |  | (29,758) |
Acquisition through business combinations |  |  |  | 387,790
Ending Balance | 9,565,566 | 311,278 | 10,311,050 | 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 | 2,300,899 | 74,875 | 1,897,984 | 1,005,714
Recognized in profit or loss | 100,134 | 3,258 | 131,276 | (17,941)
Recognized in other comprehensive income (effects of foreign currency exchange) | 195,415 | 6,359 | (79,614) | (15,455)
Purchases | 338,016 | 11,000 | 459,046 | 893,234
Disposals | (268,200) | (8,728) | (107,793) | (329,370)
Exercise of call option |  |  |  | (25,988)
Acquisition through business combinations |  |  |  | 387,790
Ending Balance | 2,666,264 | 86,764 | 2,300,899 | 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] |  |  |  |
Recognized in profit or loss | 605 | 20 |  |
Net increase (decrease) in trade receivables | 4,330,075 | 140,907 | 3,269,782 | 370,110
Trade receivables factoring (purchases) | (4,330,075) | (140,907) | (3,269,782) | (370,110)
Purchases | 14,325 | 466 |  |
Disposals | (14,930) | (486) |  |
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 | 841,231 | 27,375 | 728,398 | 755,903
Recognized in other comprehensive income (included in unrealized (losses) gains on financial assets at FVTOCI) | (366,862) | (11,938) | 129,726 | (149,856)
Recognized in other comprehensive income (effects of foreign currency exchange) | 5,558 | 181 | (4,508) | (15,562)
Purchases | 20,000 | 651 | 32,246 | 259,168
Disposals | (63,051) | (2,052) | (14,873) | (121,255)
Reclassify |  |  | (29,758) |
Ending Balance | 436,876 | 14,217 | 841,231 | 728,398
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 | 7,168,920 | 233,287 | 1,639,149 | 3,044,562
Recognized in other comprehensive income (included in unrealized (losses) gains on financial assets at FVTOCI) | (16,746) | (545) | 63,722 | (2,136)
Net increase (decrease) in trade receivables | (674,112) | (21,936) | 14,940,539 | 5,635,706
Trade receivables factoring (purchases) | (15,636) | (509) | (9,474,490) | (7,038,983)
Ending Balance | $ 6,462,426 | $ 210,297 | $ 7,168,920 | $ 1,639,149

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