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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation $ 45,240,667 $ 1,512,560 $ 39,893,786 $ 28,625,287
Right-of-use assets 1,055,458 35,288 0 0
Investment properties 594,110 19,863 392,667 122,231
Intangible assets amortization 3,576,606 119,579 2,402,450 457,666
Depreciation and amortization 50,466,841 1,687,290 42,688,903 29,205,184
Depreciation expense 46,890,235 1,567,711 40,286,453 28,747,518
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 2,092,074 69,946 1,394,664 140,175
Depreciation expense 43,749,333 1,462,699 37,903,050 26,731,714
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 1,484,532 49,633 1,007,786 317,491
Depreciation expense $ 3,140,902 $ 105,012 $ 2,383,403 $ 2,015,804