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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, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount $ 1,037,502 $ 898,992   $ 33,883
Depreciation expenses 281,027 228,821 $ 279,080  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 615,385 630,969    
Depreciation expenses 21,524 21,904 20,486  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 7,723 8,214    
Depreciation expenses 11,738 10,861 9,870  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 411,809 257,196    
Depreciation expenses 245,304 194,059 247,090  
Others [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 2,585 2,613    
Depreciation expenses $ 2,461 $ 1,997 $ 1,634