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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Balance at January 1 $ 212,802,312   $ 219,027,922  
Share of profit for the year 1,681,320 $ 59,876 1,207,974 $ 1,203,588
OTHER COMPREHENSIVE INCOME (LOSS)        
Exchange difference on translating foreign operations (831,784) (29,622) (5,202,145) 227,821
Loss from hedging (429,265) (15,287)    
Balance at December 31 231,731,160 8,252,534 212,802,312 219,027,922
Non-controlling interests [member]        
Balance at January 1 13,374,912 476,315 17,639,487 13,195,312
Share of profit for the year 1,681,320 59,876 1,207,974 1,203,588
OTHER COMPREHENSIVE INCOME (LOSS)        
Exchange difference on translating foreign operations 178,480 6,356 (414,010) (198,365)
Unrealized (loss) gain on equity instruments at FVTOCI 1,321 47 (10,773) (23,928)
Loss from hedging (145,559) (5,184)    
Remeasurement on defined benefit plans (9,075) (323) (7,422) (30,079)
Non-controlling interests arising from acquisition or disposal of subsidiaries (Note 29) (5,658) (202) 666,651 3,582,866
Subscribing for ordinary shares from subsidiaries' cash capital increase     83,044  
Acquisition of non-controlling interests in subsidiaries (Note 31) (116,738) (4,157) (5,084,785) (2,492,915)
Issuance of new ordinary shares by subsidiaries (Note 29) 1,711,453 60,949    
Partial disposal of subsidiaries       1,693,064
Subsidiaries' buy back of their own outstanding ordinary shares (Note 31) (2,299,533) (81,892) (2,017,319) (801,884)
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 1,591,904 56,692 1,672,310 1,936,643
Cash dividends to non-controlling interests (346,774) (12,350) (360,245) (424,815)
Balance at December 31 $ 15,616,053 $ 556,127 $ 13,374,912 $ 17,639,487