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Other Financial Assets - Summary of Other Financial Assets (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Jun. 30, 2016
TWD ($)
Disclosure of financial assets [Line Items]        
Other financial assets $ 247,754 $ 7,583,761 $ 1,642,840  
Current 213,638 6,539,467 472,340  
Non-current 34,116 1,044,294 1,170,500  
Time deposits with original maturity of over three months [member]        
Disclosure of financial assets [Line Items]        
Other financial assets 206,490 6,320,669 405,520  
Guaranty deposits [member]        
Disclosure of financial assets [Line Items]        
Other financial assets 25,031 766,190 170,594  
Pledged time deposits [member]        
Disclosure of financial assets [Line Items]        
Other financial assets 16,231 496,847 59,456  
Unsecured subordinate corporate bonds [member]        
Disclosure of financial assets [Line Items]        
Other financial assets     1,000,000 $ 1,000,000
Others [member]        
Disclosure of financial assets [Line Items]        
Other financial assets $ 2 $ 55 $ 7,270