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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
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 $ 482,559 $ 15,703 $ 943,354
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 419,491 13,651 820,779
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 45,683 1,486 102,124
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 13,883 452 11,245
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 $ 3,502 $ 114 $ 9,206