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Lease Arrangements - Summary of Right-of-Use Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts $ 10,680,262   $ 8,741,807   $ 385,013
Additions to right-of-use assets 3,239,770 $ 116,791 702,996 $ 824,268  
Depreciation charge for right-of-use assets 1,114,950 40,193 946,880 1,055,458  
Land [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 6,093,518   5,961,974   219,666
Depreciation charge for right-of-use assets 509,746 18,376 370,458 307,708  
Buildings and improvements [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 3,663,682   2,548,838   132,072
Depreciation charge for right-of-use assets 217,674 7,847 214,682 215,301  
Machinery and equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 880,443   181,065   31,739
Depreciation charge for right-of-use assets 356,052 12,835 335,039 507,443  
Other equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 42,619   49,930   $ 1,536
Depreciation charge for right-of-use assets $ 31,478 $ 1,135 $ 26,701 $ 25,006