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Lease Arrangements - Summary of Right-of-Use Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts $ 11,851,087   $ 11,442,266   $ 361,424
Additions to right-of-use assets 1,936,186 $ 59,048 1,680,516 $ 2,140,942  
Depreciation charge for right-of-use assets 1,415,140 43,158 1,304,020 1,468,040  
Land [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 7,747,283   7,111,397   236,270
Depreciation charge for right-of-use assets 267,959 8,172 246,617 236,673  
Buildings and improvements [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 3,492,553   4,081,525   106,513
Depreciation charge for right-of-use assets 855,492 26,090 726,510 660,276  
Machinery and equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 545,748   179,270   16,644
Depreciation charge for right-of-use assets 246,799 7,527 292,936 538,639  
Other equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 65,503   70,074   $ 1,997
Depreciation charge for right-of-use assets $ 44,890 $ 1,369 $ 37,957 $ 32,452