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Lease Arrangements - Summary of Right-of-Use Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amounts $ 8,620,612   $ 9,792,221 $ 307,002
Additions to right-of-use assets 702,996 $ 25,035 824,268  
Depreciation charge for right-of-use assets 946,880 33,721 1,055,458  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amounts 5,840,779   7,036,887 208,005
Depreciation charge for right-of-use assets 214,682 7,645 215,301  
Buildings and improvements [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amounts 2,548,838   2,121,797 90,771
Depreciation charge for right-of-use assets 370,458 13,193 307,708  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amounts 181,065   588,443 6,448
Depreciation charge for right-of-use assets 335,039 11,932 507,443  
Other equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Carrying amounts 49,930   45,094 $ 1,778
Depreciation charge for right-of-use assets $ 26,701 $ 951 $ 25,006