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Equity - Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
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