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Share-based Payment Arrangements - Summary of Information About USISH Option Plans (Detail) ¥ / shares in Units, shares in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 shares $ / shares | Dec. 31, 2024 shares ¥ / shares $ / shares | Dec. 31, 2023 shares $ / shares | Dec. 31, 2023 CNY (¥) shares ¥ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2022 shares ¥ / shares $ / shares | Dec. 31, 2024 shares ¥ / shares | Dec. 31, 2023 shares ¥ / shares | Dec. 31, 2022 shares ¥ / shares
USISH option plans [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Number of options, beginning balance | 29,728 | 29,728 |  | 20,246 | 29,486 | 29,486 |  |  |
Number of options, granted |  |  |  | 14,506 |  |  |  |  |
Number of options, expired | (1,027) | (1,027) |  | (1,204) | (2,312) | (2,312) |  |  |
Number of options, forfeited | (7,855) | (7,855) |  | (695) | (942) | (942) |  |  |
Number of options, exercised | (3,845) | (3,845) |  | (3,125) | (5,986) | (5,986) |  |  |
Number of options, Ending balance | 17,001 | 17,001 |  | 29,728 | 20,246 | 20,246 |  |  |
Number of options, exercisable, end of year | 17,001 | 17,001 | 15,310 |  | 15,518 | 15,518 | 17,001 | 15,310 | 15,518
Weighted average exercise price, Beginning balance | ¥ / shares |  | ¥ 14.7 |  | ¥ 14.5 |  | ¥ 14.2 |  |  |
Weighted average exercise price options granted | ¥ / shares |  |  |  | 14.5 |  |  |  |  |
Weighted average exercise price, Options expired | ¥ / shares |  | 14.2 |  | 14.1 |  | 13.9 |  |  |
Weighted average exercise price, Options forfeited | ¥ / shares |  | 14.3 |  | 13.6 |  | 13 |  |  |
Weighted average exercise price options exercised | ¥ / shares |  | 12.7 |  | 12.1 |  | 12.8 |  |  |
Weighted average exercise price, Ending balance | ¥ / shares |  | ¥ 15.1 |  | ¥ 14.7 |  | ¥ 14.5 |  |  |
Weighted average exercise price, Options exercisable, end of year | ¥ / shares |  |  |  |  |  |  | ¥ 15.1 | ¥ 14.9 | ¥ 15
USISH option plans [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Fair value of options granted | ¥ |  |  |  | ¥ 3.8 |  |  |  |  |
USISH option plans [member] | Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Fair value of options granted | ¥ |  |  |  | ¥ 4.7 |  |  |  |  |
AMPI Option Plans [Member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Number of options, beginning balance | 3,100 | 3,100 |  | 3,100 |  |  |  |  |
Number of options, granted |  |  |  |  | 3,100 | 3,100 |  |  |
Number of options, Ending balance | 3,100 | 3,100 |  | 3,100 | 3,100 | 3,100 |  |  |
Number of options, exercisable, end of year | 1,550 | 1,550 | 0 |  | 0 | 0 | 1,550 | 0 | 0
Weighted average exercise price, Beginning balance | $ / shares | $ 30 |  | $ 30 |  |  |  |  |  |
Weighted average exercise price options granted | $ / shares |  |  |  |  | $ 30 |  |  |  |
Weighted average exercise price, Ending balance | $ / shares | 29.7 |  | 30 |  | 30 |  |  |  |
Weighted average exercise price, Options exercisable, end of year | $ / shares | 29.7 | ¥ 29.7 | 0 |  | 0 | ¥ 0 |  |  |
Fair value of options granted (NT$) | $ / shares | $ 0 |  | $ 0 |  |  |  |  |  |
AMPI Option Plans [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Fair value of options granted (NT$) | $ / shares |  |  |  |  | 18 |  |  |  |
AMPI Option Plans [Member] | Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |
Fair value of options granted (NT$) | $ / shares |  |  |  |  | $ 18.8 |  |  |  |

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