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Equity - Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2019
USD ($)
Financial assets at fair value through other comprehensive income [line items]        
Beginning balance $ 1,597,323      
Ending balance 1,770,775 $ 59,203 $ 1,597,323  
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member]        
Financial assets at fair value through other comprehensive income [line items]        
Balance at January 1 per IAS 39 (1,015,107)   422,570 $ (33,939)
Adjustment on initial application of IFRS 9 (Note 3)     (287,053)  
Beginning balance (1,015,107) (33,939) 135,517  
Debt instruments (2,052) (69) (63,076)  
Equity instruments (283,472) (9,477) (398,513)  
Share from associates and joint venture accounted for using the equity method 1,501,689 50,207 (555,271)  
Disposal of equity instruments and transferred cumulative gain to retained earnings     (1,518)  
Disposal of associates and joint venture accounted for using the equity method     (133,364)  
Share from associates and joint venture accounted for using the equity method (404,156) (13,512) 1,118  
Ending balance $ (203,098) $ (6,790) $ (1,015,107)