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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment $ 53,500,799 $ 1,631,619 $ 51,799,481 $ 48,945,756
Right-of-use assets 1,415,140 43,158 1,304,020 1,468,040
Investment properties 1,079,259 32,914 1,091,879 1,107,014
Intangible assets amortization 3,820,014 116,499 3,906,483 3,931,079
Depreciation and amortization 59,815,212 1,824,190 58,101,863 55,451,889
Depreciation expense 55,995,198 1,707,691 54,195,380 51,520,810
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 2,370,726 72,300 2,433,492 2,465,837
Depreciation expense 51,031,493 1,556,313 49,701,740 47,894,701
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 1,449,288 44,199 1,472,991 1,465,242
Depreciation expense $ 4,963,705 $ 151,378 $ 4,493,640 $ 3,626,109