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Share-based Payment Arrangements - Summary of ASE Inc. Option Plans Outstanding Share Options (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
ASE Inc. option plans [member] | Fourth share options exercise price [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Range of Exercise Price Per Share |  | $ 45.2
Weighted Average Remaining Contractual Life (Years) |  | 3 months 18 days
ASE Inc. option plans [member] | Fifth share options exercise price [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Range of Exercise Price Per Share | $ 73.0 | $ 73.0
Weighted Average Remaining Contractual Life (Years) | 3 years 8 months 12 days | 4 years 8 months 12 days
The Company Option Plans [member] | First share options exercise price [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Range of Exercise Price Per Share | $ 51.0 | $ 52.9
Weighted Average Remaining Contractual Life (Years) | 6 years 10 months 24 days | 7 years 10 months 24 days

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