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Income Tax Expense - Details of Deferred Tax Assets (Liabilities) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2021
TWD ($)
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Deferred tax assets $ 126,213 $ 163,282 $ 159,286 $ 3,849 $ 180,598
Deferred tax liabilities (93,310) (127,193) (201,741) $ (2,846) $ (278,177)
Deferred tax assets unrealized loss on inventories [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 37,253 21,126 24,317    
Recognized in profit or loss (5,223) 16,127 (3,191)    
Ending balance 32,030 37,253 21,126    
Property, plant and equipment, deferred tax assets [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 40,741 38,894 36,636    
Ending balance 42,452 40,741 38,894    
Provisions [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 14,377 12,859 2,849    
Recognized in profit or loss (10) 1,518 10,010    
Ending balance 14,367 14,377 12,859    
Deferred tax assets deferred revenue [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 1,626 8,132 14,638    
Recognized in profit or loss (1,626) (6,506) (6,506)    
Ending balance   1,626 8,132    
Net defined benefit liability [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 42,057 48,433 97,248    
Recognized in profit or loss (4,879) (4,236) (4,368)    
Recognized in other comprehensive income (11,261) (2,140) (44,447)    
Ending balance 25,917 42,057 48,433    
Unrealized Exchange Gains Losses Deferred Tax Assets [Member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 18,185 24,217 2,161    
Recognized in profit or loss (18,185) (6,032) 22,056    
Ending balance   18,185 24,217    
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 9,043 5,625 2,749    
Recognized in profit or loss 2,404 3,418 2,876    
Ending balance 11,447 9,043 5,625    
Deferred tax asset [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance 163,282 159,286 180,598    
Recognized in profit or loss (25,808) 6,136 23,135    
Recognized in other comprehensive income (11,261) (2,140) (44,447)    
Ending balance 126,213 163,282 159,286    
Property, plant and equipment, deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (74,832) (116,974) (192,687)    
Recognized in profit or loss 9,086 42,142 75,713    
Ending balance (65,746) (74,832) (116,974)    
Unrealized exchange gains losses deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss (9,810)        
Ending balance (9,810)        
Property, plant and equipment [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Recognized in profit or loss 1,711 1,847 2,258    
Financial assets at fair value through other comprehensive income [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (21,205) (72,843) (85,402)    
Recognized in other comprehensive income 3,458 51,638 12,559    
Ending balance (17,747) (21,205) (72,843)    
Gain on investment in associates [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (31,151) (11,923)      
Recognized in profit or loss 31,151 (19,228) (11,923)    
Ending balance   (31,151) (11,923)    
Others [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (5) (1) (88)    
Recognized in profit or loss (2) (4) 87    
Ending balance (7) (5) (1)    
Deferred tax liabilities [member]          
Disclosure of the detail of deferred tax assets and liabilities [line items]          
Beginning balance (127,193) (201,741) (278,177)    
Recognized in profit or loss 30,425 22,910 63,877    
Recognized in other comprehensive income 3,458 51,638 12,559    
Ending balance $ (93,310) $ (127,193) $ (201,741)