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Other Financial Assets - Summary of Other Financial Assets (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of financial assets [Line Items]      
Other financial assets $ 1,082,000 $ 38,533 $ 1,325,327
Current 551,655 19,646 765,834
Non-current 530,345 18,887 559,493
Time deposits with original maturity of over three months [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 35,988 1,282 25,885
Guaranty deposits [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 516,505 18,394 661,667
Pledged time deposits [member]      
Disclosure of financial assets [Line Items]      
Other financial assets 367,550 13,089 620,817
Others [member]      
Disclosure of financial assets [Line Items]      
Other financial assets $ 161,957 $ 5,768 $ 16,958