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Share-based Payment Arrangements - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |
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Dec. 27, 2019 | Sep. 30, 2020 shares | Nov. 30, 2019 shares | Dec. 31, 2021 TWD ($) shares $ / shares | Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 TWD ($) shares $ / shares | Dec. 31, 2019 TWD ($) shares $ / shares | Dec. 31, 2021 USD ($) $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Compensation cost of employee share options |  |  |  | $ 699,211,000 | $ 25,206,000 | $ 955,575,000 | $ 871,699,000 |
Employee restricted stock awards plan [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Stock Issued during the period ,Restricted stock award ,shares |  |  |  | 15,000,000 | 15,000,000 |  |  |
Par value per share | (per share) |  |  |  | $ 10 |  |  |  | $ 0.36
Fair value of the employee restricted stock award |  |  |  | $ 92.4 | $ 3.33 |  |  |
Exercise price, per share | $ / shares |  |  |  |  |  | $ 0 |  |
USIE option plans [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Capital surplus decreased | $ |  |  |  |  |  | $ 1,120,111,000 | 981,078,000 |
Retained earnings decreased | $ |  |  |  |  |  | 392,447,000 |  |
USISH option plans [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Capital surplus decreased |  |  |  | $ 58,448,000 |  | $ 1,010,219,000 | $ 105,785,000 | $ 2,107,000
Options granted |  |  |  | 0 | 0 | 1,140,000 | 17,167,000 |
Number of equity instruments other than options granted |  |  |  | 281,000 | 281,000 | 672,000 | 6,156,000 |
USISH option plans [member] | Share Option [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Options granted |  |  | 17,167,000 |  |  |  |  |
USISH option plans [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  |  | 3.0 |  |  |  |  |
USISH option plans [member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  |  | 4.0 |  |  |  |  |
ASE Inc. option plans [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Share option to purchase of ordinary shares |  |  |  | 0.5 | 0.5 |  |  |
Weighted average exercise price of share options | $ / shares |  |  |  |  |  |  | $ 69.3 |
The Company Option Plans [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 10 years | 10 years |  |  |
Percentage of cash dividend per ordinary share exceeds market price |  |  |  | 1.50% | 1.50% |  |  |
Weighted average exercise price of share options | (per share) |  |  |  | $ 108.8 | $ 3.9 | $ 68.5 |  |
USISH core employees stock ownership plan [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Options granted |  |  | 6,156,000 |  |  |  |  |
Share based compensation number of additional shares to be granted |  |  | 6,403,000 |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase One [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans | 4.5 years |  |  |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase Two [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans | 3.5 years |  |  |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase Three [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans | 2.5 years |  |  |  |  |  |  |
USISH second share option plan [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Number of shares granted |  | 1,140,000 |  |  |  |  |  |
USISH second share option plan [member] | Phase One [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 1.2 years |  |  |  |  |  |
USISH second share option plan [member] | Phase Two [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 2.2 years |  |  |  |  |  |
USISH second share option plan [member] | Phase Three [Member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 3.2 years |  |  |  |  |  |
USISH second share option plan [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 2.2 |  |  |  |  |  |
USISH second share option plan [member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 3.2 |  |  |  |  |  |
USISH second share option plan [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 4.2 years |  |  |  |  |  |
USISH restricted share plan [member] |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |
Valid term of share option plans |  | 2 years |  |  |  |  |  |
Number of equity instruments other than options granted |  | 425,000 |  |  |  |  |  |
Period of lock in of ordinary shares to be issued upon satisfaction of performance conditions |  | 1 year 3 months 18 days |  |  |  |  |  |

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