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Equity Transaction with Non-controlling Interests - Additional Information (Detail) shares in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 TWD ($) shares | Dec. 31, 2024 USD ($) | Dec. 31, 2022 TWD ($) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2022 ¥ / shares
USISH [Member] |  |  |  |  |
Increase (decrease) in capital surplus | $ (186,404) |  | $ (8,963) | $ (5,685) |
Increase (decrease) in retained earnings | $ |  |  | $ (211,184) |  |
Number of shares approved for repurchase | shares | 6,740 |  | 9,356 | 6,740 |
USISH [Member] | Bottom of range [member] |  |  |  |  |
Par value per share |  |  |  |  | ¥ 11.15
USISH [Member] | Top of range [member] |  |  |  |  |
Par value per share |  |  |  |  | ¥ 14.38
AMPI [Member] |  |  |  |  |
Increase (decrease) in capital surplus | $ (63,702) |  |  | $ (1,943) |
Increase (decrease) in retained earnings | $ (5,439) | $ (166) |  |  |

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