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Profit Before Income Tax - Summary of Employee Benefits Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Post-employment benefits        
Defined contribution plans $ 2,340,826 $ 78,975 $ 2,356,416 $ 2,324,737
Defined benefit plans 266,267 8,983 394,741 413,490
Post-employment benefits 2,607,093 87,958 2,751,157 2,738,227
Equity-settled share-based payments 438,765 14,803 470,788 133,496
Other employee benefits 51,043,198 1,722,105 49,525,940 47,883,464
Employee benefits expense 54,089,056 1,824,866 52,747,885 50,755,187
Operating costs [member]        
Post-employment benefits        
Employee benefits expense 35,978,403 1,213,846 35,588,529 34,720,359
Operating expenses [member]        
Post-employment benefits        
Employee benefits expense $ 18,110,653 $ 611,020 $ 17,159,356 $ 16,034,828