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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation $ 28,747,518 $ 969,890 $ 28,961,614 $ 28,938,770
Investment properties 122,231 4,124    
Intangible assets amortization 457,666 15,441 508,823 579,894
Depreciation and amortization 29,205,184 985,331 29,470,437 29,518,664
Operating costs [member]        
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation 26,731,714 901,880 26,948,106 27,023,957
Intangible assets amortization 140,175 4,729 152,987 124,235
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Property, plant and equipment depreciation 2,015,804 68,010 2,013,508 1,914,813
Intangible assets amortization $ 317,491 $ 10,712 $ 355,836 $ 455,659