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Financial Instruments - Summary of Financial Assets Measured at Level 3 Fair Value (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of fair value measurement of assets [line items]        
Beginning Balance $ 534,061,927      
Net increase in trade receivables 995,839 $ 33,295 $ (9,313,539) $ (4,066,374)
Ending Balance 557,223,706 18,630,014 534,061,927  
Available-for-sale [member] | Level 3 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 2,072,446 69,290 1,988,549  
Recognized in profit or loss 3,431 115 (2,313)  
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (218,173) (7,295) (287,248)  
Recognized in other comprehensive income (effects of foreign currency exchange) (20,063) (670)    
Net increase in trade receivables 3,171,205 106,025    
Purchases 951,513 31,812 582,436  
Trade receivables factoring (purchases) (1,141,515) (38,165)    
Disposals (12,665) (424) (208,978)  
Ending Balance 4,806,179 160,687 2,072,446 1,988,549
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 475,123 15,885    
Recognized in profit or loss 3,431 115 (2,313)  
Recognized in other comprehensive income (effects of foreign currency exchange) (14,368) (480)    
Purchases 541,528 18,105 477,436  
Ending Balance 1,005,714 33,624 475,123  
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI equity instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 580,399 19,405 908,549  
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (216,121) (7,226) (224,172)  
Recognized in other comprehensive income (effects of foreign currency exchange) (5,695) (190)    
Purchases 409,985 13,707 105,000  
Disposals (12,665) (424) (208,978)  
Ending Balance 755,903 25,272 580,399 908,549
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI debt instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 1,016,924 34,000 1,080,000  
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (2,052) (69) (63,076)  
Net increase in trade receivables 3,171,205 106,025    
Trade receivables factoring (purchases) (1,141,515) (38,165)    
Ending Balance $ 3,044,562 $ 101,791 $ 1,016,924 $ 1,080,000