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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Share of profit for the year $ 1,207,974 $ 40,387 $ 1,203,588 $ 1,677,941
Balance at January 1 219,027,922   201,310,187 166,841,165
OTHER COMPREHENSIVE INCOME (LOSS)        
Exchange difference on translating foreign operations (5,202,145) (173,927) 227,821 (5,287,734)
Unrealized gain on available-for-sale financial assets       224,036
Balance at December 31 212,802,312 7,114,755 219,027,922 201,310,187
Non-controlling interests [member]        
Share of profit for the year 1,207,974 40,387 1,203,588 1,677,941
Balance at January 1 17,639,487   13,190,129 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS)        
Exchange difference on translating foreign operations (414,010) (13,842) (198,365) (334,920)
Unrealized gain on available-for-sale financial assets       5,763
Unrealized loss on equity instruments at FVTOCI (10,773) (360) (23,928)  
Remeasurement on defined benefit plans (7,422) (248) (30,079) (13,724)
Non-controlling interests arising from acquisition of subsidiaries (Note 30) 666,651 22,289 3,582,866  
Subscribing for ordinary shares form subsidiaries' cash capital increase 83,044 2,776    
Acquisition of non-controlling interests in subsidiaries (5,084,785) (170,003) (2,492,915)  
Partial disposal of subsidiaries (Note 32)     1,693,064 (3,055)
Subsidiaries' buy back of their own outstanding ordinary shares (Note 32) (2,017,319) (67,446) (801,884)  
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 1,672,310 55,911 1,936,643 263,213
Non-controlling interest relating to outstanding expired employee share options granted by subsidiaries       (159,200)
Cash dividends to non-controlling interests (360,245) (12,044) (424,815) (246,440)
Balance at December 31 13,374,912 447,172 17,639,487 13,190,129
Non-controlling interests [member] | Pre IFRS 15 [member]        
Balance at January 1 17,639,487 589,752 13,190,129 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS)        
Balance at December 31     17,639,487 13,190,129
Non-controlling interests [member] | Adjustments arising from initial application [member]        
OTHER COMPREHENSIVE INCOME (LOSS)        
Adjustment on initial application of IFRS 15 (Note 3)     5,183  
Non-controlling interests [member] | Adoption of IFRS 15 [member]        
Balance at January 1 $ 17,639,487 $ 589,752 13,195,312 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS)        
Balance at December 31     $ 17,639,487 $ 13,195,312