XML 80 R98.htm IDEA: XBRL DOCUMENT v3.20.1
Operating Costs and Expenses - Additional Information (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Accrued Employee Compensation $ 338,356 $ 199,027 $ 371,912
Accrued Directors remuneration $ 16,918 $ 9,951 $ 18,596
Defined benefit pension plan [Member]      
Disclosure of defined benefit plans [line items]      
Employees' compensation distribution rate 10.00%    
Director remuneration rate no more than 0.50%