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Income Tax Expense - Details of Deferred Tax Assets (Liabilities) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Deferred tax assets $ 159,286 $ 180,598 $ 185,691 $ 5,183 $ 194,552
Deferred tax liabilities (201,741) (278,177) (310,427) $ (6,565) $ (309,129)
Deferred tax assets unrealized loss on inventories [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 24,317 15,963 12,700    
Recognized in profit or loss (3,191) 8,354 3,263    
Ending balance 21,126 24,317 15,963    
Property, plant and equipment, deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 36,636 36,401 38,668    
Ending balance 38,894 36,636 36,401    
Provisions [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 2,849 2,678 5,600    
Recognized in profit or loss 10,010 171 (2,922)    
Ending balance 12,859 2,849 2,678    
Deferred tax assets deferred revenue [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 14,638 21,144 27,650    
Recognized in profit or loss (6,506) (6,506) (6,506)    
Ending balance 8,132 14,638 21,144    
Net defined benefit liability [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 97,248 98,921 92,612    
Recognized in profit or loss (4,368) (4,672) (4,089)    
Recognized in other comprehensive income (44,447) 2,999 10,398    
Ending balance 48,433 97,248 98,921    
Unrealized exchange losses deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 2,161 9,915 17,296    
Recognized in profit or loss 22,056 (7,754) (7,381)    
Ending balance 24,217 2,161 9,915    
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 2,749 669 26    
Recognized in profit or loss 2,876 2,080 643    
Ending balance 5,625 2,749 669    
Deferred tax asset [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 180,598 185,691 194,552    
Recognized in profit or loss 23,135 (8,092) (19,259)    
Recognized in other comprehensive income (44,447) 2,999 10,398    
Ending balance 159,286 180,598 185,691    
Property, plant and equipment, deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (192,687) (255,484) (288,980)    
Recognized in profit or loss 75,713 62,797 33,496    
Ending balance (116,974) (192,687) (255,484)    
Property, plant and equipment [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss 2,258 235 (2,267)    
Financial assets at fair value through other comprehensive income [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (85,402) (54,943) (20,149)    
Recognized in other comprehensive income 12,559 (30,459) (34,794)    
Ending balance (72,843) (85,402) (54,943)    
Gain on investment in associates [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss (11,923)        
Ending balance (11,923)        
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (88)        
Recognized in profit or loss 87 (88)      
Ending balance (1) (88)      
Deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (278,177) (310,427) (309,129)    
Recognized in profit or loss 63,877 62,709 33,496    
Recognized in other comprehensive income 12,559 (30,459) (34,794)    
Ending balance $ (201,741) $ (278,177) $ (310,427)