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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, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount $ 835,805 $ 859,069   $ 30,130
Depreciation expenses 279,080 76,526 $ 36,099  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 616,458 636,261    
Depreciation expenses 20,486 20,938 22,657  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 10,946 19,044    
Depreciation expenses 9,870 7,819 7,113  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 204,484 203,249    
Depreciation expenses 247,090 46,225 4,520  
Others [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amount 3,917 515    
Depreciation expenses $ 1,634 $ 1,544 $ 1,809