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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2018
TWD ($)
Share of profit for the year $ 39,320 $ 1,203,588 $ 1,677,941 $ 1,253,438  
Balance at January 1   201,310,187 166,841,165 165,924,980  
OTHER COMPREHENSIVE INCOME (LOSS)          
Exchange difference on translating foreign operations 7,443 227,821 (5,287,734) (6,445,643)  
Unrealized gain on available-for-sale financial assets     224,036 (248,599)  
Balance at December 31 7,155,436 219,027,922 201,310,187 166,841,165  
Non-controlling interests [member]          
Share of profit for the year 39,341 1,204,217 1,677,941 1,253,438  
Balance at January 1   13,190,129 12,000,551 11,492,545  
OTHER COMPREHENSIVE INCOME (LOSS)          
Exchange difference on translating foreign operations (6,480) (198,365) (334,920) (601,787)  
Unrealized gain on available-for-sale financial assets     5,763 1,129  
Unrealized loss on equity instruments at FVTOCI (782) (23,928)      
Remeasurement on defined benefit plans (983) (30,079) (13,724) 8,846  
Non-controlling interests arising from acquisition of subsidiaries (Note 30) 117,049 3,582,866      
Acquisition of non-controlling interests in subsidiaries (81,441) (2,492,915)   42,857  
Partial disposal of subsidiaries (Note 32) 55,311 1,693,064 (3,055) 26,436  
Subsidiaries' buy back of their own outstanding ordinary shares (Note 32) (26,197) (801,884)   (912,886)  
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries 63,268 1,936,643 263,213 927,823  
Non-controlling interest relating to outstanding expired employee share options granted by subsidiaries     (159,200)    
Cash dividends to non-controlling interests (13,878) (424,815) (246,440) (237,850)  
Balance at December 31 576,265 17,639,487 13,190,129 12,000,551  
Non-controlling interests [member] | Pre IFRS 15 [member]          
Balance at January 1 430,909 13,190,129 12,000,551 11,492,545  
OTHER COMPREHENSIVE INCOME (LOSS)          
Balance at December 31     13,190,129 12,000,551  
Non-controlling interests [member] | Adjustments arising from initial application [member]          
OTHER COMPREHENSIVE INCOME (LOSS)          
Adjustment on initial application of IFRS 15 (Note 3) 169       $ 5,183
Non-controlling interests [member] | Adoption of IFRS 15 [member]          
Balance at January 1 $ 431,078 $ 13,195,312 12,000,551 11,492,545  
OTHER COMPREHENSIVE INCOME (LOSS)          
Balance at December 31     $ 13,195,312 $ 12,000,551