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Other Financial Assets - Summary of Other Financial Assets (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of financial assets [Line Items]      
Other financial assets $ 1,325,327 $ 44,311 $ 7,583,761
Current 765,834 25,605 6,539,467
Non-current 559,493 18,706 1,044,294
Time deposits with original maturity of over three months [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 25,885 866 6,320,669
Guaranty deposits [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 661,667 22,122 766,190
Pledged time deposits [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 620,817 20,756 496,847
Others [member]      
Disclosure of financial assets [Line Items]      
Other financial assets $ 16,958 $ 567 $ 55