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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Investments in Equity Instruments at Fair Value Through Other Comprehensive Income (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in equity instruments at FVTOCI $ 943,354 $ 34,007 $ 728,398
Unquoted ordinary shares [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in equity instruments at FVTOCI 820,779 29,588 567,377
Limited partnership [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in equity instruments at FVTOCI 9,206 332 9,692
Unquoted preferred shares [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in equity instruments at FVTOCI 11,245 405 $ 151,329
Quoted ordinary shares      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in equity instruments at FVTOCI $ 102,124 $ 3,682