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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, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount $ 898,992 $ 835,805   $ 29,255
Depreciation expenses 228,821 279,080 $ 76,526  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 630,969 616,458    
Depreciation expenses 21,904 20,486 20,938  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 8,214 10,946    
Depreciation expenses 10,861 9,870 7,819  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 257,196 204,484    
Depreciation expenses 194,059 247,090 46,225  
Others [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 2,613 3,917    
Depreciation expenses $ 1,997 $ 1,634 $ 1,544