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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Beginning balance $ 268,171,060   $ 231,737,116 $ 212,802,312
Share of profit for the year 3,116,549 $ 101,418 2,099,830 1,681,320
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations 10,326,729 336,047 (4,094,565) (831,784)
Share in other comprehensive income from associates accounted for using the equity method (152,833) (4,974) 29,209 131,009
Ending balance 313,276,385 10,194,480 268,171,060 231,737,116
Non-controlling interests [member]        
Beginning balance 14,544,415 473,297 15,622,009 13,374,912
Share of profit for the year 3,116,549 101,418 2,099,830 1,681,320
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations 344,780 11,220 (321,551) 178,480
Unrealized gain (loss) on equity instruments at FVTOCI (44,852) (1,460) 50,679 1,321
Gain (Loss) from hedging 110,781 3,605 187,502 (145,559)
Remeasurement on defined benefit plans 51,582 1,679 1,497 (9,075)
Share in other comprehensive income from associates accounted for using the equity method (35,142) (1,144) 7,902  
Non-controlling interests arising from acquisition or disposal of subsidiaries (Note 29)       298
Acquisition of non-controlling interests in subsidiaries (Note 31)       (116,738)
Issuance of ordinary shares by subsidiaries (Note 29)       1,711,453
Subsidiaries' buy back of their own outstanding ordinary shares (Note 31) (312,775) (10,178) (2,748,521) (2,299,533)
Equity component of convertible bonds issued by subsidiaries 1,092,004 35,535 393,199  
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 315,871 10,279 314,398 1,591,904
Cash dividends to non-controlling interests (575,089) (18,715) (1,062,529) (346,774)
Ending balance $ 18,608,124 $ 605,536 $ 14,544,415 $ 15,622,009