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Effects on initial application of IFRS 16 - Additional Information (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2019
TWD ($)
Dec. 31, 2018
Statement [line items]          
Right-of-use asset $ 687,068 $ 859,069 $ 30,594    
Lease liability 692,951 $ 870,495      
Rent Expense $ 28,126        
Bottom of range [member]          
Statement [line items]          
Incremental borrowing interest rate       1.7895% 1.7895%
Top of range [member]          
Statement [line items]          
Incremental borrowing interest rate       3.9474% 3.9474%
Effects of adopting new standards [member]          
Statement [line items]          
Right-of-use asset       $ 898,387  
Lease liability       884,275  
Lease assets       31,904  
Lease obligations payable       $ 17,792