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New Accounting Pronouncement under International Financial Reporting Standards (IFRSs) - Additional Information (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Jan. 01, 2019
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Significant​ Changes​ In Financial​ Statement​ Line​ Items ​Due​To Application​ Of IFRS9, IAS39 and IFRS7 [line items]          
Adjustments for decrease in other current assets   $ 5,769,041 $ 192,880 $ 743,519 $ (4,397,764)
Bottom of range [member]          
Significant​ Changes​ In Financial​ Statement​ Line​ Items ​Due​To Application​ Of IFRS9, IAS39 and IFRS7 [line items]          
Hedge effectiveness percentage   80.00% 80.00%    
Top of range [member]          
Significant​ Changes​ In Financial​ Statement​ Line​ Items ​Due​To Application​ Of IFRS9, IAS39 and IFRS7 [line items]          
Hedge effectiveness percentage   125.00% 125.00%    
IFRS 16 [member]          
Significant​ Changes​ In Financial​ Statement​ Line​ Items ​Due​To Application​ Of IFRS9, IAS39 and IFRS7 [line items]          
Adjustments for decrease in other current assets $ 15,000        
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 2.64%        
Adjustments for Increase in right-of-use assets $ 8,578,000        
Adjustments for decrease in other noncurrent assets 2,621,000        
Adjustments for decrease in trade and other payables 40,000        
Adjustments for increase in lease liabilities 6,006,000        
Adjustments for decrease in APIC 10,000        
Adjustments for decrease through changes in other components of equity $ 14,000