Financial Assets at Fair Value Through Profit or Loss - Summary of Amounts recognized in Profit or Loss in Relation to Financial Assets at Fair Value Through Profit or Loss (Detail)
$ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2023

TWD ($)

Dec. 31, 2023

USD ($)

Dec. 31, 2022

TWD ($)

Dec. 31, 2021

TWD ($)

Financial Assets At Fair Value Through Profit Or Loss [line items]

Financial assets mandatorily measured at fair value through profit or loss

$ 39,254

$ 1,282

$ (69,404)

$ 15,262

Foreign partnership interests [member]

Financial Assets At Fair Value Through Profit Or Loss [line items]

Financial assets mandatorily measured at fair value through profit or loss

(941)

Beneficiary certificates [member]

Financial Assets At Fair Value Through Profit Or Loss [line items]

Financial assets mandatorily measured at fair value through profit or loss

17,253

5,807

2,530

Listed stocks [member]

Financial Assets At Fair Value Through Profit Or Loss [line items]

Financial assets mandatorily measured at fair value through profit or loss

$ 22,001

$ (75,211)

$ 13,673

Financial Assets at Fair Value Through Profit or Loss - Summary of Amounts recognized in Profit or Loss in Relation to Financial Assets at Fair Value Through Profit or Loss (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Financial Assets At Fair Value Through Profit Or Loss [line items]
Financial assets mandatorily measured at fair value through profit or loss	$ 39,254	$ 1,282	$ (69,404)	$ 15,262
Foreign partnership interests [member]
Financial Assets At Fair Value Through Profit Or Loss [line items]
Financial assets mandatorily measured at fair value through profit or loss				(941)
Beneficiary certificates [member]
Financial Assets At Fair Value Through Profit Or Loss [line items]
Financial assets mandatorily measured at fair value through profit or loss	17,253		5,807	2,530
Listed stocks [member]
Financial Assets At Fair Value Through Profit Or Loss [line items]
Financial assets mandatorily measured at fair value through profit or loss	$ 22,001		$ (75,211)	$ 13,673