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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
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