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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation $ 48,604,160 $ 1,752,133 $ 46,016,548 $ 45,240,667
Right-of-use assets 1,114,950 40,193 946,880 1,055,458
Investment properties 751,047 27,074 562,260 594,110
Intangible assets amortization 4,054,120 146,147 3,733,377 3,576,606
Depreciation and amortization 54,524,277 1,965,547 51,259,065 50,466,841
Depreciation expense 50,470,157 1,819,400 47,525,688 46,890,235
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 2,443,870 88,099 2,231,060 2,092,074
Depreciation expense 46,880,267 1,689,988 44,017,839 43,749,333
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 1,610,250 58,048 1,502,317 1,484,532
Depreciation expense $ 3,589,890 $ 129,412 $ 3,507,849 $ 3,140,902