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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended
Jun. 30, 2016
TWD ($)
Bonds
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Financial assets at fair value through other comprehensive income [line items]        
Unsecured subordinate corporate bonds amount   $ 1,325,327 $ 44,311 $ 7,583,761
Unsecured subordinate corporate bonds [member]        
Financial assets at fair value through other comprehensive income [line items]        
Unsecured subordinate corporate bonds amount $ 1,000,000 $ 1,000 $ 33  
Number of bonds acquired 1,000      
Corporate bonds annual interest rate 3.50%      
Effective interest rate   3.20% 3.20% 3.20%