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Income Tax Expense - Details of Deferred Tax Assets (Liabilities) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
TWD ($)
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss $ 14,237 $ (35,367) $ (98,667)    
Deferred tax assets 185,691 194,552 226,716 $ 6,613 $ 212,372
Deferred tax liabilities (310,427) (309,129) (308,759) $ (11,055) $ (174,293)
Deferred tax assets unrealized loss on inventories [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 12,700 7,232 9,132    
Effects on initial application of IFRS 9 and IFRS 15     (770)    
Recognized in profit or loss 3,263 5,468 (1,130)    
Ending balance 15,963 12,700 7,232    
Property, plant and equipment, deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 38,668 64,183 55,494    
Recognized in profit or loss (2,267) (25,515) 8,689    
Ending balance 36,401 38,668 64,183    
Provisions [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 5,600 12,396 21,643    
Recognized in profit or loss (2,922) (6,796) (9,247)    
Ending balance 2,678 5,600 12,396    
Deferred tax assets deferred revenue [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 27,650 34,156 39,485    
Recognized in profit or loss (6,506) (6,506) (5,329)    
Ending balance 21,144 27,650 34,156    
Net defined benefit liability [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 92,612 100,743 78,451    
Recognized in profit or loss (4,089) (3,948) 7,889    
Recognized in other comprehensive income 10,398 (4,183) 14,403    
Ending balance 98,921 92,612 100,743    
Unrealized exchange losses deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 17,296 3,575 8,167    
Effects on initial application of IFRS 9 and IFRS 15     144    
Recognized in profit or loss (7,381) 13,721 (4,736)    
Ending balance 9,915 17,296 3,575    
Investment tax credit [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance   4,420      
Recognized in profit or loss   (4,420) 4,420    
Ending balance     4,420    
Other [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 26 11      
Recognized in profit or loss 643 15 11    
Ending balance 669 26 11    
Deferred tax asset [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 194,552 226,716 212,372    
Effects on initial application of IFRS 9 and IFRS 15     (626)    
Recognized in profit or loss (19,259) (27,981) 567    
Recognized in other comprehensive income 10,398 (4,183) 14,403    
Ending balance 185,691 194,552 226,716    
Property, plant and equipment, deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (288,980) (281,594) (174,293)    
Recognized in profit or loss 33,496 (7,386) (107,301)    
Ending balance (255,484) (288,980) (281,594)    
Deferred tax liabilities, contract assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Effects on initial application of IFRS 9 and IFRS 15     (8,067)    
Recognized in profit or loss     8,067    
Financial assets at fair value through other comprehensive income [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (20,149) (27,165)      
Effects on initial application of IFRS 9 and IFRS 15     (8,636)    
Recognized in other comprehensive income (34,794) 7,016 (18,529)    
Ending balance (54,943) (20,149) (27,165)    
Deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (309,129) (308,759) (174,293)    
Effects on initial application of IFRS 9 and IFRS 15     (16,703)    
Recognized in profit or loss 33,496 (7,386) (99,234)    
Recognized in other comprehensive income (34,794) 7,016 (18,529)    
Ending balance $ (310,427) $ (309,129) $ (308,759)