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Leasing arrangements - leasee - summary of carrying amount of right-of-use assets and the depreciation expenses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount $ 1,026,591 $ 1,037,502   $ 31,308
Depreciation expenses 303,294 281,027 $ 228,821  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 734,958 615,385    
Depreciation expenses 24,248 21,524 21,904  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 13,458 7,723    
Depreciation expenses 12,195 11,738 10,861  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 260,375 411,809    
Depreciation expenses 261,383 245,304 194,059  
Others [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 17,800 2,585    
Depreciation expenses $ 5,468 $ 2,461 $ 1,997