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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Balance at January 1 $ 231,737,116   $ 212,802,312  
Share of profit for the year 2,099,830 $ 75,697 1,681,320 $ 1,207,974
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations (4,094,565) (147,605) (831,784) (5,202,145)
Share of other comprehensive income from associates accounted for using the equity method 29,209 1,053 131,009 (85,975)
Balance at December 31 268,171,060 9,667,306 231,737,116 212,802,312
Non-controlling interests [member]        
Balance at January 1 15,622,009 563,158 13,374,912 17,639,487
Share of profit for the year 2,099,830 75,697 1,681,320 1,207,974
Other comprehensive income (loss) for the year        
Exchange difference on translating foreign operations (321,551) (11,592) 178,480 (414,010)
Unrealized gain (loss) on equity instruments at FVTOCI 50,679 1,827 1,321 (10,773)
Gain (Loss) from hedging 187,502 6,759 (145,559)  
Remeasurement on defined benefit plans 1,497 54 (9,075) (7,422)
Share of other comprehensive income from associates accounted for using the equity method 7,902 285    
Non-controlling interests arising from acquisition or disposal of subsidiaries (Note 29)     298 666,651
Acquisition of non-controlling interests in subsidiaries (Note 31)     (116,738) (5,084,785)
Issuance of ordinary shares by subsidiaries (Note 29)     1,711,453 83,044
Subsidiaries' buy back of their own outstanding ordinary shares (Note 31) (2,748,521) (99,081) (2,299,533) (2,017,319)
Equity component of convertible bonds issued by subsidiaries 393,199 14,174    
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 314,398 11,334 1,591,904 1,672,310
Cash dividends distributed to non-controlling interests (1,062,529) (38,303) (346,774) (360,245)
Balance at December 31 $ 14,544,415 $ 524,312 $ 15,622,009 $ 13,374,912