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Profit Before Income Tax - Summary of Employee Benefits Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Post-employment benefits        
Defined contribution plans $ 96,865 $ 2,965,054 $ 2,340,826 $ 2,356,416
Defined benefit plans 9,518 291,333 266,267 394,741
Post-employment benefits 106,383 3,256,387 2,607,093 2,751,157
Equity-settled share-based payments 7,045 215,648 438,765 470,788
Other employee benefits 2,088,874 63,940,430 51,043,198 49,525,940
Employee benefits expense 2,202,302 67,412,465 54,089,056 52,747,885
Operating costs [member]        
Post-employment benefits        
Employee benefits expense 1,481,972 45,363,170 35,978,403 35,588,529
Operating expense [member]        
Post-employment benefits        
Employee benefits expense $ 720,330 $ 22,049,295 $ 18,110,653 $ 17,159,356