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Profit Before Income Tax - Summary of Employees' Compensation and Remuneration to Directors (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation | $ 155,398 | $ 5,057 | $ 121,935 |
Remuneration to directors | $ 248,637 | $ 8,091 | 195,095 |
Resolved by the board of directors [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation |  |  | 122,000 | $ 54,909
Remuneration to directors |  |  | 194,000 | 109,000
Recognized in the consolidated financial statements [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation |  |  | 121,935 | 54,909
Remuneration to directors |  |  | $ 195,095 | $ 109,818

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