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Share-based Payment Arrangements - Summary of Information About ASE Inc. Option Plans (Detail) - The Company Option Plans [member] shares in Thousands | 12 Months Ended
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of options, beginning balance | shares | 96,802 | 144,767 | 170,786
Number of options, forfeited | shares | (1,206) | (5,907) | (3,949)
Number of options, expired | shares | 0 | 0 | (1,006)
Number of options, exercised | shares | (14,334) | (42,058) | (21,064)
Number of options, Ending balance | shares | 81,262 | 96,802 | 144,767
Number of options, exercisable, end of year | shares | 58,216 | 49,696 | 67,388
Weighted average exercise price, Beginning balance | $ / shares | $ 53.3 | $ 56.9 | $ 57
Weighted average exercise price, Options expired | $ / shares | 0 | 0 | 40.8
Weighted average exercise price, Options forfeited | $ / shares | 51.1 | 52.3 | 58
Weighted average exercise price, Options exercised | $ / shares | 51.5 | 61.4 | 49.2
Weighted average exercise price, Ending balance | $ / shares | 50.2 | 53.3 | 56.9
Weighted average exercise price, Options exercisable, end of year | $ / shares | $ 51.3 | $ 55.5 | $ 61.4

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