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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Beginning balance $ 314,750,655   $ 313,276,385 $ 268,171,060
Share of profit for the year 1,437,974 $ 43,854 1,849,952 3,116,549
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations 12,788,423 390,010 (1,536,221) 10,326,729
Share in other comprehensive loss from associates accounted for using the equity method (18,192) (555) (28,511) (152,833)
Disposal of subsidiary     (295,895)  
Non-controlling interest arising from capital increase of subsidiaries     427,913  
Ending balance 342,270,913 10,438,273 314,750,655 313,276,385
Non-controlling interests [member]        
Beginning balance 20,270,547 618,193 18,608,124 14,544,415
Share of profit for the year 1,437,974 43,854 1,849,952 3,116,549
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations 687,077 20,954 (47,301) 344,780
Unrealized gain (loss) on equity instruments at FVTOCI 6,599 201 26,560 (44,852)
Gain (loss) from hedging 124,336 3,792 (69,189) 110,781
Remeasurement on defined benefit plans 3,270 100 (15,876) 51,582
Share in other comprehensive loss from associates accounted for using the equity method (7,157) (218) (7,514) (35,142)
Repurchase of outstanding shares by subsidiaries (Note 31) (270,291) (8,243) 0 (312,775)
Disposal of subsidiary 0 0 (295,895) 0
Non-controlling interest arising from capital increase of subsidiaries 177,487 5,413 427,913 0
The Group's subscription for subsidiaries' capital increase at a percentage different from its existing ownership (Note 31) 69,141 2,108 0 0
Cash dividends distributed to non-controlling interests (593,390) (18,097) (912,261) (575,089)
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 238,183 7,264 293,740 315,871
Equity component of convertible bonds issued by subsidiaries 100,885 3,077 412,294 1,092,004
Ending balance $ 22,244,661 $ 678,398 $ 20,270,547 $ 18,608,124