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Income Tax Expense - Details of Deferred Tax Assets (Liabilities) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Deferred tax assets $ 180,598 $ 185,691 $ 194,552 $ 6,510 $ 226,716
Deferred tax liabilities (278,177) (310,427) (309,129) $ (10,028) $ (308,759)
Deferred tax assets unrealized loss on inventories [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 15,963 12,700 7,232    
Recognized in profit or loss 8,354 3,263 5,468    
Ending balance 24,317 15,963 12,700    
Property, plant and equipment, deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 36,401 38,668 64,183    
Recognized in profit or loss 235 (2,267) (25,515)    
Ending balance 36,636 36,401 38,668    
Provisions [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 2,678 5,600 12,396    
Recognized in profit or loss 171 (2,922) (6,796)    
Ending balance 2,849 2,678 5,600    
Deferred tax assets deferred revenue [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 21,144 27,650 34,156    
Recognized in profit or loss (6,506) (6,506) (6,506)    
Ending balance 14,638 21,144 27,650    
Net defined benefit liability [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 98,921 92,612 100,743    
Recognized in profit or loss (4,672) (4,089) (3,948)    
Recognized in other comprehensive income 2,999 10,398 (4,183)    
Ending balance 97,248 98,921 92,612    
Unrealized exchange losses deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 9,915 17,296 3,575    
Recognized in profit or loss (7,754) (7,381) 13,721    
Ending balance 2,161 9,915 17,296    
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)    
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 669 26 11    
Recognized in profit or loss 2,080 643 15    
Ending balance 2,749 669 26    
Deferred tax asset [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 185,691 194,552 226,716    
Recognized in profit or loss (8,092) (19,259) (27,981)    
Recognized in other comprehensive income 2,999 10,398 (4,183)    
Ending balance 180,598 185,691 194,552    
Property, plant and equipment, deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (255,484) (288,980) (281,594)    
Recognized in profit or loss 62,797 33,496 (7,386)    
Ending balance (192,687) (255,484) (288,980)    
Financial assets at fair value through other comprehensive income [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (54,943) (20,149) (27,165)    
Recognized in other comprehensive income (30,459) (34,794) 7,016    
Ending balance (85,402) (54,943) (20,149)    
Deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (310,427) (309,129) (308,759)    
Recognized in profit or loss 62,709 33,496 (7,386)    
Recognized in other comprehensive income (30,459) (34,794) 7,016    
Ending balance (278,177) $ (310,427) $ (309,129)    
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss (88)        
Ending balance $ (88)