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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation $ 1,303,293 $ 39,893,786 $ 28,625,287 $ 28,961,614
Investment properties 12,828 392,667 122,231  
Intangible assets amortization 78,486 2,402,450 457,666 508,823
Depreciation and amortization 1,394,607 42,688,903 29,205,184 29,470,437
Depreciation expense 1,316,121 40,286,453 28,747,518 28,961,614
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 45,562 1,394,664 140,175 152,987
Depreciation expense 1,238,257 37,903,050 26,731,714 26,948,106
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 32,924 1,007,786 317,491 355,836
Depreciation expense $ 77,864 $ 2,383,403 $ 2,015,804 $ 2,013,508