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Equity Transaction with Non-controlling Interests - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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May 31, 2020 USD ($) | Dec. 31, 2021 TWD ($) shares | Sep. 30, 2020 $ / shares | Jul. 31, 2019 USD ($) $ / shares | Jul. 31, 2018 TWD ($) $ / shares | Dec. 31, 2021 TWD ($) $ / shares shares | Dec. 31, 2019 TWD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 01, 2021 TWD ($) | Dec. 01, 2021 USD ($) | Sep. 30, 2021 ¥ / shares | Sep. 01, 2021 TWD ($) | Sep. 01, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Sep. 01, 2020 TWD ($) shares | Jul. 31, 2019 TWD ($) | Jul. 01, 2019 TWD ($) shares
USI Enterprise Limited ("USIE") [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  | $ 2,093,787 |  |  |  | $ 2,093,787 |  | $ 75,479 | $ 47,171 | $ 1,700 |  |  |  | $ 2,760,175 | $ 780,533 |  | $ 1,625,448
Number of shares approved for repurchase | shares |  | 9,137 |  |  |  | 9,137 |  | 9,137 |  |  |  |  |  |  | 10,308 |  | 7,378
Shares repurchase price per share | $ / shares |  |  | $ 19.47 | $ 14.30 |  | $ 17.20 |  |  |  |  |  |  |  |  |  |  |
USI Enterprise Limited ("USIE") [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  | 95.85% | 95.00% | 95.42% |  |  |  |  |  |  |  |  |  |  |  |  |
USI Enterprise Limited ("USIE") [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  | 100.00% | 99.62% | 98.72% |  |  |  |  |  |  |  |  |  |  |  |  |
ASEN [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,650,950 |
Amount of shares transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 97,748 |
Percentage of shareholdings |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shareholdings |  |  |  | $ 162,870 |  |  |  |  |  |  |  |  |  |  |  |  |
ASEN [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |
ASEN [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
USI INC [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  |  |  |  | $ 142 |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares outstanding acquired price | $ / shares |  |  |  |  | $ 18 |  |  |  |  |  |  |  |  |  |  |  |
USISH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  | $ 436,927 |  |  |  | $ 436,927 | $ 334,719 | $ 15,751 |  |  |  | $ 11,277 | $ 407 |  |  |  |
Number of shares approved for repurchase | shares |  | 16,042 |  |  |  | 16,042 | 13,037 | 16,042 |  |  |  |  |  |  |  |  |
USISH [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  |  |  |  |  |  | 74.60% |  |  |  |  |  |  |  |  |  |
Par value per share | ¥ / shares |  |  |  |  |  |  |  |  |  |  | ¥ 13.86 |  |  |  |  |  |
USISH [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  |  |  |  |  |  | 77.70% |  |  |  |  |  |  |  |  |  |
Par value per share | ¥ / shares |  |  |  |  |  |  |  |  |  |  | ¥ 14.95 |  |  |  |  |  |
ASEEE [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128,805
Percentage of ShareHolding Held |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
USIPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,502 |  |  |
Amount of shareholdings | $ 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shareholdings | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USIPL [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USIPL [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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