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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation $ 46,016,548 $ 1,638,766 $ 45,240,667 $ 39,893,786
Right-of-use assets 946,880 33,721 1,055,458  
Investment properties 562,260 20,023 594,110 392,667
Intangible assets amortization 3,733,377 132,955 3,576,606 2,402,450
Depreciation and amortization 51,259,065 1,825,465 50,466,841 42,688,903
Depreciation expense 47,525,688 1,692,510 46,890,235 40,286,453
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 2,231,060 79,454 2,092,074 1,394,664
Depreciation expense 44,017,839 1,567,587 43,749,333 37,903,050
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 1,502,317 53,501 1,484,532 1,007,786
Depreciation expense $ 3,507,849 $ 124,923 $ 3,140,902 $ 2,383,403