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Issued Capital - Additional Information (Detail)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Aug. 15, 2018
TWD ($)
shares
Dec. 31, 2019
TWD ($)
$ / shares
shares
Dec. 31, 2018
TWD ($)
shares
Dec. 31, 2017
shares
Dec. 31, 2019
USD ($)
shares
Disclosure of classes of share capital [line items]          
Ordinary shares par value | $ / shares   $ 10      
Number of shares outstanding   727,240     727,240
Percentage of capital reduction 15.00%        
Amount of capital reduction | $ $ 1,329,446        
Capital reduction       0  
Authorised capital | $   $ 9,700,000      
Number of shares authorised   970,000     970,000
Paid in capital   $ 7,272,401 $ 7,528,577   $ 243,143
Ordinary shares [member]          
Disclosure of classes of share capital [line items]          
Number of shares outstanding   96,035     96,035
Capital reduction 132,945,000   (128,422,000)    
American depositary shares [member]          
Disclosure of classes of share capital [line items]          
Number of shares represented by each unit of ADS   20      
Number of shares outstanding   4,801,737     4,801,737