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Equity - Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Financial assets at fair value through other comprehensive income [line items] |  |  |  |
Balance at January 1 | $ 1,663,737 |  |  |
Other comprehensive income for the year, net of income tax | 13,638,305 | $ 415,929 | $ 449,350 | $ 8,632,472
Ending balance | 13,959,493 | 425,724 | 1,663,737 |
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] |  |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |  |
Balance at January 1 | 3,549,648 | 108,254 | 1,275,505 | 4,190,361
Debt instruments | (14,830) | (452) | (22,599) | (16,746)
Equity instruments | (18,871) | (576) | (77,496) | (8,360)
Share from associates and joint ventures accounted for using the equity method | 155,784 | 4,751 | 2,447,656 | (2,928,173)
Other comprehensive income for the year, net of income tax | 122,083 | 3,723 | 2,347,561 | (2,953,279)
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal | 72,049 | 2,197 | 230,940 | 190,500
Cumulative unrealized gain transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method | (13,221) | (403) | (304,358) | (152,077)
Ending balance | $ 3,730,559 | $ 113,771 | $ 3,549,648 | $ 1,275,505

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