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Profit Before Income Tax - Summary of Employee Benefits Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Post-employment benefits        
Defined contribution plans $ 3,148,209 $ 105,256 $ 2,965,054 $ 2,340,826
Defined benefit plans 277,041 9,263 291,333 266,267
Post-employment benefits 3,425,250 114,519 3,256,387 2,607,093
Equity-settled share-based payments 871,699 29,144 215,648 438,765
Other employee benefits 70,279,752 2,349,707 63,940,430 51,043,198
Employee benefits expense 74,576,701 2,493,370 67,412,465 54,089,056
Operating costs [member]        
Post-employment benefits        
Employee benefits expense 49,173,778 1,644,058 45,363,170 35,978,403
Operating expense [member]        
Post-employment benefits        
Employee benefits expense $ 25,402,923 $ 849,312 $ 22,049,295 $ 18,110,653